strpbrk
The Situation:
I wanted to return TRUE if strpos returned position 0, and only position 0, without the added overhead of preg_match.
The Solution:
As PHP treats 0 (zero) as NULL, and strpos returns the int 0 (but not NULL), I used type casting and the "===" comparison operator (as it compares types) to resolve my issue.
<?php
$hayStack = "dbHost";
$needle = "db"
$needlePos = strpos($hayStack, $needle);
if((string)$needlePos === (string)0) {
echo "db is in position zero";
} else {
echo "db is NOT in position zero";
}
?>
Returns:
db is in position zero
<?php
$hayStack = "another_db_host";
$needle = "db"
$needlePos = strpos($hayStack, $needle);
if((string)$needlePos === (string)0) {
echo "db is in position zero";
} else {
echo "db is NOT in position zero";
}
?>
This returns:
db is in NOT position zero
strpos
(PHP 4, PHP 5)
strpos — 文字列が最初に現れる場所を見つける
説明
文字列 haystack の中で、 needle が最初に現れた位置を数字で返します。 PHP 5 以前の strrpos() とは異なり、この関数は needle パラメータとして文字列全体をとり、 その文字列全体が検索対象となります。
パラメータ
- haystack
-
検索を行う文字列。
- needle
-
needle が文字列でない場合は、 それを整数に変換し、その番号に対応する文字として扱います。
- offset
-
オプションのパラメータ offset により、 検索を開始する haystack の文字を指定することができます。 この場合でも、返される位置は haystack の先頭からの相対位置となります。
返り値
位置を表す整数値を返します。 needle が見つからない場合、 strpos() は boolean FALSE を返します。
例
例1 === の使用
<?php
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring, $findme);
// === を使用していることに注目しましょう。単純に == を使ったのでは
// 期待通りに動作しません。なぜなら 'a' が 0 番目 (最初) の文字だからです。
if ($pos === false) {
echo "文字列 '$findme' は、文字列 '$mystring' の中で見つかりませんでした";
} else {
echo "文字列 '$findme' が文字列 '$mystring' の中で見つかりました";
echo " 見つかった位置は $pos です";
}
?>
例2 !== の使用
<?php
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring, $findme);
// !== 演算子も使用可能です。ここで != を使っても期待通りに動作しません。
// なぜなら 'a' が 0 番目の文字だからです。(0 != false) を評価すると
// false になってしまいます。
if ($pos !== false) {
echo "文字列 '$findme' が文字列 '$mystring' の中で見つかりました";
echo " 見つかった位置は $pos です";
} else {
echo "文字列 '$findme' は、文字列 '$mystring' の中で見つかりませんでした";
}
?>
例3 オフセットの使用
<?php
// オフセット以前の内容を無視して文字を探すこともできます。
$newstring = 'abcdef abcdef';
$pos = strpos($newstring, 'a', 1); // $pos は 0 ではなく 7 となります。
?>
注意
注意: この関数はバイナリデータに対応しています。
add a note
User Contributed Notesstrpos
jburns131 at jbwebware dot com
28-Dec-2008 02:48
28-Dec-2008 02:48
Tim
18-Nov-2008 03:52
18-Nov-2008 03:52
If you would like to find all occurences of a needle inside a haystack you could use this function strposall($haystack,$needle);. It will return an array with all the strpos's.
<?php
/**
* strposall
*
* Find all occurrences of a needle in a haystack
*
* @param string $haystack
* @param string $needle
* @return array or false
*/
function strposall($haystack,$needle){
$s=0;
$i=0;
while (is_integer($i)){
$i = strpos($haystack,$needle,$s);
if (is_integer($i)) {
$aStrPos[] = $i;
$s = $i+strlen($needle);
}
}
if (isset($aStrPos)) {
return $aStrPos;
}
else {
return false;
}
}
?>
Anonymous
28-Oct-2008 10:20
28-Oct-2008 10:20
@samundra dot shr at gmail dot com
You can simplify this a lot by using str_replace to do the work for you
<?php
$filename=$_POST['filename'];
if(!$fpin=@fopen($filename,"r"))
{
print "<b>Error ! File Doesn't Exists</b>";
exit();
}
$text='';
while(!feof($fpin))
{
$text.=fread($fpin,1024);
}
$newtext = str_replace(array("\n", "\r"), '', $text);
$fp=fopen("sample.txt","wb+");
fwrite($fp,$newtext);
fclose($fp);
print "File Changed Successfully.";
?>
Or simply using php5 and not needing to do all the fread/fwrite
<?php
$filename=$_POST['filename'];
if(file_exists($filename)) {
file_put_contents('sample.txt', str_replace(array("\n", "\r"), '', file_get_contents($filename)));
}
else {
print "<b>Error ! File Doesn't Exists</b>";
}
?>
atomkirk at hotmail dot com
23-Oct-2008 04:19
23-Oct-2008 04:19
careful that when you put a strpos in an if statement that you take note that if the string is in the 0 position it will return false, causing your control structure to think its not in the string.
samundra dot shr at gmail dot com
28-Sep-2008 09:40
28-Sep-2008 09:40
This is the code,I wrote today, I wanted to strip all the newlines, and format the output in a single line so as to lower the filesize of my php source files.
<?php
/****************************************
@ Code By : Samundra Shrestha
@ Dated : September 28,2008
P.S. Remember to remove all single line comments from the source file
otherwise the file may get corrupted.
******************************************/
if(!isset($_POST['change']) || !isset($_POST['filename']))
{
print "<b>".strtoupper("Paste the fullpath of the file")."</b>";
print "<form name='FrmChange' method='post' action='".$_SERVER['PHP_SELF']."'>";
print "<input type='textbox' name='filename' size='50px' maxlength='255'>";
print "<input type='submit' name='change' value='Start'>";
print "</form>";
}
else
{
$filename=$_POST['filename'];
if(!$fpin=@fopen($filename,"r"))
{
print "<b>Error ! File Doesn't Exists</b>";
exit();
}
$text="";
$i=0;
/*Put the contents of file into the string*/
while(!feof($fpin))
{
$text.=fread($fpin,1024);
}
$count=strlen($text);
$pos=strpos($text,"\n"); //Gives the First occurence of newline
while($i<$count)
{
if($i<$pos-1)
{
$newtext.=$text{$i}; //C Style of String Indexing
}
else
{
$pos=strpos($text,"\n",$i+1);
}
$i++;
}
$newtext.="?>"; //necessary as somehow it is removed from the original source file.
$fp=fopen("sample.txt","wb+");
fwrite($fp,$newtext);
fclose($fp);
print "File Changed Successfully.";
}
?>
The resultant code is all in one new line saved in file sample.txt
I hope, this comes handy to someone.
Cheers,
Samundra Shrestha
http://www.samundra.com.np
mickRacky
19-Sep-2008 09:17
19-Sep-2008 09:17
here's a php implementation of stdc++ string class find_first_of using strpos.
<?php
function find_first_of($haystack, $needlesAsString, $offset=0)
{
$max = strlen($needlesAsString);
$index = strlen($haystack)+1;
for($ii=0; $ii<$max;$ii++){
$result = strpos($haystack,$needlesAsString[$ii], $offset);
if( $result !== FALSE && $result < $index)
$index = $result;
}
return ( $index > strlen($haystack)? FALSE: $index);
}
?>
Example:
<?php
$test="Ralph: One of these days, Alice!!";
$look_for=":!,"; // punctuation marks
$ss = 0;
while( $answer=find_first_of($test,$look_for,$ss) ) {
echo $answer . "\n";
$ss = $answer+1;
}
?>
This prints out:
5
24
31
32
Wartosh
22-Aug-2008 12:01
22-Aug-2008 12:01
Hi,
Chuzasoft Inc : maybe I haven't understood your goal clearly, but I think there is a faster way to determinate whether a pattern is contained in a string (like using the " LIKE '%bla bla%' " in SQL).
You should read about "Regular Expression" (powerfull string operations are allowed using it) : http://fr.php.net/manual/en/book.pcre.php
Your example, it should be written like this :
<?
$myString = "Hi, this is good!";
$srchStrg = ".*thi.* goo.*";
$srchRes = preg_match("/$searchThis/", $myString);
if ( $searchResult != 0 )
echo "TRUE: string has been found :-)";
else
echo "FALSE: string wasn't found :'-(";
?>
Sincerely
Chuzasoft Inc. ARGENTINA
05-Aug-2008 10:16
05-Aug-2008 10:16
Hi! Don't you people miss the pretty comparison operator 'LIKE' from mySql in PHP??.
I've made this funtion to emulate that method. It's for search a match string into another String
using the '%' caracter just like you do un the LIKE syntax.
For example:
<?php
$mystring = "Hi, this is good!";
$searchthis = "%thi% goo%";
$resp = milike($mystring,$searchthis);
if ($resp){
echo "milike = VERDADERO";
} else{
echo "milike = FALSO";
}
?>
Will print:
milike = VERDADERO
and so on...
this is the function:
<?php
function milike($cadena,$busca){
if($busca=="") return 1;
$vi = split("%",$busca);
$offset=0;
for($n=0;$n<count($vi);$n++){
if($vi[$n]== ""){
if($vi[0]== ""){
$tieneini = 1;
}
} else {
$newoff=strpos($cadena,$vi[$n],$offset);
if($newoff!==false){
if(!$tieneini){
if($offset!=$newoff){
return false;
}
}
if($n==count($vi)-1){
if($vi[$n] != substr($cadena,strlen($cadena)-strlen($vi[$n]), strlen($vi[$n]))){
return false;
}
} else {
$offset = $newoff + strlen($vi[$n]);
}
} else {
return false;
}
}
}
return true;
}
?>
Good luck!
majewsky at gmx dot net
27-Jun-2008 11:51
27-Jun-2008 11:51
Paul: May it be that the ! operator is evaluated before the ===? In this case, the return value of strpos (0 in the described case) would be implicitly converted to bool (value true because 0 converts to false). Then, true === false is evaluated to false.
paul at thiswayupdesign dot co dot uk
18-Jun-2008 01:48
18-Jun-2008 01:48
I wasn't aware of the !== operator, only the === for false. I was using this code on strpos:
while( ! ($start=@strpos($source,$startTag,$end)) === false)
This gave a false if the string was found at position 0, which is weird.
However using
while(($start=@strpos($source,$startTag,$end)) !== false)
Gives no such error and seems to work correctly
pawhox
26-May-2008 04:19
26-May-2008 04:19
Hello! I was founding a function, which finds any occurence of a string (no: first occurence). I wasn't, so I maked this function! It may be very useful.
<?php
int strnpos(string $haystack, mixed $needle, int $occurence);
?>
Example:
<?php
strnpos("I like the bananas. You like coke. We like chocolate.", "like", 2); // 24
?>
Here's code of this function:
<?php
function strnpos($base, $str, $n)
{
if ($n <= 0 || intval($n) != $n || substr_count($base, $str) < $n) return FALSE;
$str = strval($str);
$len = 0;
for ($i=0 ; $i<$n-1 ; ++$i)
{
if ( strpos($base, $str) === FALSE ) return FALSE;
$len += strlen( substr($base, 0, strpos($base, $str) + strlen($str)) );
$base = substr($base, strpos($base, $str) + strlen($str) );
}
return strpos($base, $str) + $len;
}
?>
ilaymyhat-rem0ve at yahoo dot com
02-Apr-2008 03:17
02-Apr-2008 03:17
This might be useful.
class String{
//Look for a $needle in $haystack in any position
public static function contains(&$haystack, &$needle, &$offset)
{
$result = strpos($haystack, $needle, $offset);
return $result !== FALSE;
}
//intuitive implementation .. if not found returns -1.
public static function strpos(&$haystack, &$needle, &$offset)
{
$result = strpos($haystack, $needle, $offset);
if ($result === FALSE )
{
return -1;
}
return $result;
}
}//String
loaded67 at hotmail dot com
20-Feb-2008 05:08
20-Feb-2008 05:08
Refereing to my last note.
It wasn't correct! As ctype_digit only evaluates strings.
(string) true / false will still be 0 / 1.
is_int(); is the correct function!
loaded67 at hotmail dot com
18-Feb-2008 08:22
18-Feb-2008 08:22
As mentioned before....
0 === false
0 == false
1 === true
etc...
I found it very usefull to use ctype_digit(); with this function!
<?php
$string = 'whatever!#%@^% is going on...'; //correct
//$string = 'whatever? is going on...'; //false char 8
//ctype_digit only works on strings so type cast...
if(ctype_digit((string) strpos($string, '?'))){
echo 'found at least one...<br/>'.PHP_EOL;
}
else{
echo 'no char index retrieved... <br/>'.PHP_EOL;
}
?>
amendment to last post on pink WARNING
12-Jan-2008 02:02
12-Jan-2008 02:02
There's actually a fourth conceivable test for "any position other than 0" --
ADD:
!= "" (disrecommended as highly confusing)
This then makes the final paragraph inaccurate (one case where comparing to "" is meaningful). It should just be removed entirely -- too much unneeded detail on a tangent anyway.
Suggested re-write for pink WARNING box
12-Jan-2008 01:45
12-Jan-2008 01:45
WARNING
As strpos may return either FALSE (substring absent) or 0 (substring at start of string), strict versus loose equivalency operators must be used very carefully.
To know that a substring is absent, you must use:
=== FALSE
To know that a substring is present (in any position including 0), you can use either of:
!== FALSE (recommended)
> -1 (note: or greater than any negative number)
To know that a substring is at the start of the string, you must use:
=== 0
To know that a substring is in any position other than the start, you can use any of:
> 0 (recommended)
!= 0 (note: but not !== 0 which also equates to FALSE)
!= FALSE (disrecommended as highly confusing)
Also note that you cannot compare a value of "" to the returned value of strpos. With a loose equivalence operator (== or !=) it will return results which don't distinguish between the substring's presence versus position. With a strict equivalence operator (=== or !==) it will always return false.
Lau
24-Dec-2007 02:45
24-Dec-2007 02:45
WARNING: The documentation says:
"Use the === operator for testing the return value of this function"
but it should say:
"Use '!== false' or '=== false' for testing the return value of this function"
Therefore to test if a needle occurst in a hastack do this:
if ( strpos($haystack, $needle) !== false){
echo 'found needle in haystack!';
}
Using '=== true' or '!== true' or '== true' or '== false' will all return the wrong value when the needle is found in the haystack.
using ' >= 0 ' returns the wrong value when the needle is not found in the haystack.
By "wrong value" I mean a value that is counter-intuitive but is never-the-less correct according to the weird way in which strpos has been coded. Why on earth didn't they just return -1 if the needle was not found? Then we could just test for >= 0
Here's a full list of the value returned:
(strpos("bbb", "aaa") >= 0) returns true EXPECTED FALSE
(strpos("bbb", "aaa") == true) returns false expected false
(strpos("bbb", "aaa") == false) returns true expected true
(strpos("bbb", "aaa") === true) returns false expected false
(strpos("bbb", "aaa") === false) returns true expected true
(strpos("bbb", "aaa") !== false) returns false expected false
(strpos("bbb", "aaa") !== true) returns true expected true
(strpos("aaa", "aaa") >= 0) returns true expected true
(strpos("aaa", "aaa") == true) returns false EXPECTED TRUE
(strpos("aaa", "aaa") == false) returns true EXPECTED FALSE
(strpos("aaa", "aaa") === true) returns false EXPECTED TRUE
(strpos("aaa", "aaa") !== false) returns true expected true
(strpos("aaa", "aaa") === false) returns false expected false
(strpos("aaa", "aaa") !== true) returns true EXPECTED FALSE
giulioNOSPAM at iunknown dot org
31-Oct-2007 12:19
31-Oct-2007 12:19
A further implementation of the great rstrpos function posted in this page. Missing some parameters controls, but the core seems correct.
<?php
// Parameters:
//
// haystack : target string
// needle : string to search
// offset : which character in haystack to start searching, FROM THE END OF haystack
// iNumOccurrence : how many needle to search into haystack beginning from offset ( i.e. the 4th occurrence of xxx into yyy )
function rstrpos ($haystack, $needle, $offset=0, $iNumOccurrence=1)
{
//
$size = strlen ($haystack);
$iFrom = $offset;
$iLoop = 0;
//
do
{
$pos = strpos (strrev($haystack), strrev($needle), $iFrom);
$iFrom = $pos + strlen($needle);
}
while ((++$iLoop)<$iNumOccurrence);
//
if($pos === false) return false;
//
return $size - $pos - strlen($needle);
}
?>
Benjie
14-Oct-2007 02:49
14-Oct-2007 02:49
str_replace evaluates its arguments exactly once.
for example:
<?php
$page = str_replace("##randompicture##", getrandompicture(), $page);
?>
will call getrandompicture() once, ie it will insert the same random picture for each occurrence of ##randompicture## :(
Here is my quick and dirty workaround:
<?php
function add_random_pictures($text) {
while (($i = strpos($text, "##randompicture##")) !== false) {
$text = substr_replace($text, getrandompicture(), $i, strlen("##randompicture##"));
}
return $text;
}
$page = add_random_pictures($page);
?>
HS_AT_Duijst_DOT_com
09-Sep-2007 12:51
09-Sep-2007 12:51
Just to be clear: unlike stripos(), strpos() is case-sensitive.
Cybertinus
28-Aug-2007 02:05
28-Aug-2007 02:05
@Wagner Christian:
Yes, there are better methods. The best is to just cast is. You cast like this:
<?php
$id = 1;
$string = (string) $id;
?>
If you var_dump() $string now you get the following output:
string(1) "1"
This is the recommended method. You're example should look like this then:
<?php
$id = 1;
$my_text = "hel124lo";
$first_position =strpos($my_text , (string) $id);
?>
Wagner Christian
17-Aug-2007 11:11
17-Aug-2007 11:11
If you plan to use an integer as needle you need first to convert your integer into a String else it's not going to work.
For exemple :
<?php
$id = 1;
$my_text = "hel124lo";
$first_position =strpos($my_text ,substr($id,0));
?>
There are for sure some another solutions to convert an integer into a string in php.
user at nomail dot com
15-May-2007 12:21
15-May-2007 12:21
This is a bit more useful when scanning a large string for all occurances between 'tags'.
<?php
function getStrsBetween($s,$s1,$s2=false,$offset=0) {
/*====================================================================
Function to scan a string for items encapsulated within a pair of tags
getStrsBetween(string, tag1, <tag2>, <offset>
If no second tag is specified, then match between identical tags
Returns an array indexed with the encapsulated text, which is in turn
a sub-array, containing the position of each item.
Notes:
strpos($needle,$haystack,$offset)
substr($string,$start,$length)
====================================================================*/
if( $s2 === false ) { $s2 = $s1; }
$result = array();
$L1 = strlen($s1);
$L2 = strlen($s2);
if( $L1==0 || $L2==0 ) {
return false;
}
do {
$pos1 = strpos($s,$s1,$offset);
if( $pos1 !== false ) {
$pos1 += $L1;
$pos2 = strpos($s,$s2,$pos1);
if( $pos2 !== false ) {
$key_len = $pos2 - $pos1;
$this_key = substr($s,$pos1,$key_len);
if( !array_key_exists($this_key,$result) ) {
$result[$this_key] = array();
}
$result[$this_key][] = $pos1;
$offset = $pos2 + $L2;
} else {
$pos1 = false;
}
}
} while($pos1 !== false );
return $result;
}
?>
Rich Deeson
26-Apr-2007 06:58
26-Apr-2007 06:58
Here's a somewhat more efficient way to truncate a string at the end of a word. This will end the string on the last dot or last space, whichever is closer to the cut off point. In some cases, a full stop may not be followed by a space eg when followed by a HTML tag.
<?php
$shortstring = substr($originalstring, 0, 400);
$lastdot = strrpos($shortstring, ".");
$lastspace = strrpos($shortstring, " ");
$shortstring = substr($shortstring, 0, ($lastdot > $lastspace? $lastdot : $lastspace));
?>
Obviously, if you only want to split on a space, you can simplify this:
<?php
$shortstring = substr($originalstring, 0, 400);
$shortstring = substr($shortstring, 0, strrpos($shortstring, " "));
?>
14-Apr-2007 05:18
Thanks to spinicrus (see above) I have sorted out a problem that was bugging me for ages. I have a routine in Etomite Content Management System that will display a set number of characters of a news item and invite visitors to "Read more".
Unfortunately the 400 character summary sometimes displayed a partial word at the end.
Using the following code based on spinicrus's exampleI have now overcome this.
#################################
#only full word at the end
$string=$rest;
$charToFind=" ";
$searchPos = $lentoshow;
$searchChar = '';
//
while ($searchChar != $charToFind) {
$newPos = $searchPos-1;
$searchChar = substr($string,$newPos,strlen($charToFind));
$searchPos = $newPos;
}
$rest=substr($string,0,$searchPos)." ";
################################
sinai [at] simnet [dot] is
11-Apr-2007 03:35
11-Apr-2007 03:35
If you want to check for either IE6 or 7 individually.
<?php
function browserIE($version)
{
if($version == 6 || $version == 7)
{
$browser = strpos($_SERVER['HTTP_USER_AGENT'], "MSIE ".$version.".0;");
if($browser == true)
{
return true;
}
else
{
return false;
}
else
{
return false;
}
?>
gal_chen123 at hotmail dot co dot il
03-Apr-2007 07:57
03-Apr-2007 07:57
this function returns the text between 2 strings:
function get_between ($text, $s1, $s2) {
$mid_url = "";
$pos_s = strpos($text,$s1);
$pos_e = strpos($text,$s2);
for ( $i=$pos_s+strlen($s1) ; ( ( $i < ($pos_e)) && $i < strlen($text) ) ; $i++ ) {
$mid_url .= $text[$i];
}
return $mid_url;
}
if $s1 or $s2 are not found, $mid_url will be empty
to add an offset, simply compare $pos_s to the offset, and only let it continue if the offset is smaller then $pos_s.
IcEye
26-Jan-2007 09:23
26-Jan-2007 09:23
Get text between $s1 and $s2, return an array contains every occurrence (based on code of old comment/s but with offset and without strtolower)
Sample:
$myDivsContent = getStrsBetween("<div","</div>",$myHtmlSrc);
Sample:
or...get rows for html table
...
...
//using TextBetween from old comment...
$aTable = TextBetween("<table","</table>",$myHtmlSrc);
$rows = getStrsBetween("<tr","</tr>",$aTable);
...
...
function getStrsBetween($s1,$s2,$s,$offset=0){
$result = array();
$index= 0;
$L1 = strlen($s1);
$found = false;
do{
if($L1>0){
$pos1 = strpos($s,$s1,$offset);
}
else {
$pos1=$offset;
}
if($pos1 !== false){
if($s2 == '')
$result[$index++]= substr($s,$pos1+$L1);
$pos2 = strpos(substr($s,$pos1+$L1),$s2,$L1);
if($pos2!==false){
$result[$index++]= substr($s,$pos1+$L1,$pos2);
$offset += $pos2 + strlen($s2);
}
else{
$pos1 = false;
}
}
}while($pos1 !== false);
return $result;
}
BUGs/Problems:
Function do not stop while $s1 is found in $s.
jamie at jamiechong dot ca
19-Jan-2007 10:15
19-Jan-2007 10:15
Try this function to find the first position of needle before a given offset.
For example:
<?php
$s = "This is a test a is This";
$offset = strpos($s, "test");
strnpos($s, "is", $offset); // returns 17
strnpos($s, "is", -$offset); // returns 5
// Works just like strpos if $offset is positive.
// If $offset is negative, return the first position of needle
// before before $offset.
function strnpos($haystack, $needle, $offset=0)
{
if ($offset>=0)
$result=strpos($haystack, $needle, $offset);
else
{
$offset=strlen($haystack)+$offset;
$haystack=strrev($haystack);
$needle=strrev($needle);
$result=strpos($haystack, $needle, $offset);
if ($result!==false)
{
$result+=strlen($needle);
$result=strlen($haystack)-$result;
}
}
return $result;
}
?>
14-Jan-2007 02:52
this is nice you are so excited but parsing href=" will never really work.
remember whitespaces
mvp at mvpprograms dot com
29-Dec-2006 10:30
29-Dec-2006 10:30
I understand the excitement of "admin at xylotspace dot com." I wrote three functions that I use in EVERY website I develop. What they do is get the text between strings. I made them case-insensitive (for php < 5) using "strtolower." This would not be necessary if you used "stripos." Now the first function is close to what "admin at xylotspace dot com" wrote, but does not have the position element. It also will return an empty string if no substring was found. If you want to get the title of an HTML document use:
TextBetween('<title>','</title>',$content);
The second function was revolutionary for me, because it gets an array of items between pairs of strings. So, with that I can grab most XML lists, or get all the links or images in a document. All the links in a document could be found using:
TextBetweenArray('href="','"',$content);
The third is less used, but is useful to process an array and get substrings within each record.
//-----GET TEXT BETWEEN STRINGS------
function TextBetween($s1,$s2,$s){
$s1 = strtolower($s1);
$s2 = strtolower($s2);
$L1 = strlen($s1);
$scheck = strtolower($s);
if($L1>0){$pos1 = strpos($scheck,$s1);} else {$pos1=0;}
if($pos1 !== false){
if($s2 == '') return substr($s,$pos1+$L1);
$pos2 = strpos(substr($scheck,$pos1+$L1),$s2);
if($pos2!==false) return substr($s,$pos1+$L1,$pos2);
}
return '';
}
//-----GET ARRAY TEXT BETWEEN STRINGS------
function TextBetweenArray($s1,$s2,$s){
$myarray=array();
$s1=strtolower($s1);
$s2=strtolower($s2);
$L1=strlen($s1);
$L2=strlen($s2);
$scheck=strtolower($s);
do{
$pos1 = strpos($scheck,$s1);
if($pos1!==false){
$pos2 = strpos(substr($scheck,$pos1+$L1),$s2);
if($pos2!==false){
$myarray[]=substr($s,$pos1+$L1,$pos2);
$s=substr($s,$pos1+$L1+$pos2+$L2);
$scheck=strtolower($s);
}
}
} while (($pos1!==false)and($pos2!==false));
return $myarray;
}
//-----GET SUBTEXT IN ARRAY ITEMS------
function SubTextBetweenArray($s1,$s2,$myarray){
for ($i=0; $i< count($myarray); $i++)
{$myarray[$i]=TextBetween($s1,$s2,$myarray[$i]);}
return $myarray;
}
koteskie at gmail dot com
18-Dec-2006 12:31
18-Dec-2006 12:31
I've been looking at previous posts and came up with this function to find the start and end off an certain occurance or all occurances of needle within haystack.
I've made some minor tweaks to the code itself, like counting the length of needle only once and counting the result set array instead of using a count variable.
I also added a length parameter to the result set to use in a following substr_replace call etc...
<?php
function strpos_index($haystack = '',$needle = '',$offset = 0,$limit = 99,$return = null)
{
$length = strlen($needle);
$occurances = array();
while((($count = count($occurances)) < $limit) && (false !== ($offset = strpos($haystack,$needle,$offset))))
{
$occurances[$count]['length'] = $length;
$occurances[$count]['start'] = $offset;
$occurances[$count]['end'] = $offset = $offset + $length;
}
return $return === null ? $occurances : $occurances[$return];
}
?>
Charles
03-Dec-2006 10:10
03-Dec-2006 10:10
Small improvement on the efforts of others:
<?php
function strpos_all($hs_haystack, $hs_needle, $hn_offset = 0, $hn_limit = 0) {
$ha_positions = array();
$hn_count = 0;
while (false !== ($pos = strpos($hs_haystack, $hs_needle, $hn_offset)) && ($hn_limit == 0 || $hn_count < $hn_limit)) {
$ha_positions[] = $pos;
$hn_offset = $pos + strlen($hs_needle);
++$hn_count;
}
return $ha_positions;
}
function preg_pos($hs_pattern, $hs_subject, &$hs_foundstring, $hn_offset = 0) {
$hs_foundstring = NULL;
if (preg_match($hs_pattern, $hs_subject, $ha_matches, PREG_OFFSET_CAPTURE, $hn_offset)) {
$hs_foundstring = $ha_matches[0][0];
return $ha_matches[0][1];
}
else {
return FALSE;
}
}
function preg_pos_all($hs_pattern, $hs_subject, &$ha_foundstring, $hn_offset = 0, $hn_limit = 0) {
$ha_positions = array();
$ha_foundstring = array();
$hn_count = 0;
while (false !== ($pos = preg_pos($hs_pattern, $hs_subject, $hs_foundstring, $hn_offset)) && ($hn_limit == 0 || $hn_count < $hn_limit)) {
$ha_positions[] = $pos;
$ha_foundstring[] = $hs_foundstring;
$hn_offset = $pos + 1; // alternatively: '$pos + strlen($hs_foundstring)'
++$hn_count;
}
return $ha_positions;
}
print_r(preg_pos_all('/s...s/', "she sells sea shells on the sea floor", $ha_matches));
print_r($ha_matches);
?>
spinicrus at gmail dot com
14-Oct-2006 08:58
14-Oct-2006 08:58
if you want to get the position of a substring relative to a substring of your string, BUT in REVERSE way:
<?php
function strpos_reverse_way($string,$charToFind,$relativeChar) {
//
$relativePos = strpos($string,$relativeChar);
$searchPos = $relativePos;
$searchChar = '';
//
while ($searchChar != $charToFind) {
$newPos = $searchPos-1;
$searchChar = substr($string,$newPos,strlen($charToFind));
$searchPos = $newPos;
}
//
if (!empty($searchChar)) {
//
return $searchPos;
return TRUE;
}
else {
return FALSE;
}
//
}
?>
admin at xylotspace dot com
27-Sep-2006 05:33
27-Sep-2006 05:33
Yay! I came up with a very useful function. This finds a beginning marker and an ending marker (the first after the beginning marker), and returns the contents between them. You specify an initial position in order to tell it where to start looking. You can use a while() or for() loop to get all occurence of a certain string within a string (for example, taking all hyperlinks in a string of HTML code)...
function get_middle($source, $beginning, $ending, $init_pos) {
$beginning_pos = strpos($source, $beginning, $init_pos);
$middle_pos = $beginning_pos + strlen($beginning);
$ending_pos = strpos($source, $ending, $beginning_pos + 1);
$middle = substr($source, $middle_pos, $ending_pos - $middle_pos);
return $middle;
}
For example, to find the URL of the very first hyperlink in an HTML string $data, use:
$first_url = get_middle($data, '<a href="', '"', 0);
It's done wonders for scraping HTML pages with certain tools on my website.
banana dot meal at gmail dot com
25-Aug-2006 04:07
25-Aug-2006 04:07
To thepsion5 at hotmail dot com:
Please mind the warning part of the documentation!
Your function won't work on $Haystack s starting with $needle.
Here's a solution for that:
<?
function findAllOccurences($Haystack, $needle, $limit=0)
{
$Positions = array();
$currentOffset = 0;
$count=0;
while(($pos = strpos($Haystack, $needle, $offset))!==false && ($count < $limit || $limit == 0))
{
$Positions[] = $pos;
$offset = $pos + strlen($needle);
$count++;
}
return $Positions;
}
?>
spam at robkohr dot com
10-Aug-2006 10:38
10-Aug-2006 10:38
Simple function to determine if a needle occurs in a haystack
function is_substr($needle, $haystack){
$pos = strpos($haystack, $needle);
if ($pos === false) {
return false;
} else {
return true;
}
}
thepsion5 at hotmail dot com
07-Aug-2006 08:57
07-Aug-2006 08:57
I created this little function based on the one posted by chasesan at gmail dot com; It find all occurences of a string within another string and returns their positions as an array:
<?PHP
function findAllOccurences($Haystack, $needle, $limit=0)
{
$Positions = array();
$currentOffset = 0;
$count=0;
while(($pos = strpos($Haystack, $needle, $offset)) && ($count < $limit || $limit == 0))
{
$Positions[] = $pos;
$offset = $pos + strlen($needle);
$count++;
}
return $Positions;
}
?>
I hope this helps someone :)
wolfeym38 at yahoo dot com
24-Jul-2006 09:24
24-Jul-2006 09:24
I finally figured out how to use this function correctly (and efficiently) if you want to test for a needle that may start at the beginning of haystack, simply use
if (strpos($haystack, $needle) === 0)) {
do stuff here..
}
someone else mentioned that you needed to assign a variable first and test to make sure that it was === true first.. That is not needed
wormss at wormss dot net
19-Jul-2006 03:26
19-Jul-2006 03:26
Im sure there are more efficient methods of this, but i use this alot when dealing with rss and was proud of it.
<?
function data_from_element($needle,$haystack,$tags=FALSE) { // Expects two Strings, returns Array
$needle_start = "<".$needle.">"; $needle_end = "</".$needle.">";
$array = array(); $pos_start = 0;
while(($pos_start = strpos($haystack,$needle_start,$pos_start)) !== false) {
$pos_end = strpos($haystack,$needle_end,$pos_start);
if($tags) $array[] = substr($haystack,$pos_start,$pos_end-$pos_start+strlen($needle_end));
else $array[] = substr($haystack,$pos_start + strlen($needle_start),$pos_end - $pos_start - strlen($needle_start));
$pos_start++;
}
return $array;
}
d
//example
$rss = '<?xml version="1.0"?> <rss version="2.0"> <channel> <title>Example RSS</title> <description>Example RSS Description</description> <link>http://example.com/rss/</link> <item> <title>Example RSS 1</title> <link>http://example.com/rss/1.html</link> <description>Example 1</description> </item> <item> <title>Example RSS 2</title> <link>http://example.com/rss/2.html</link> <description>Example 2</description> </item> </channel> </rss>';
$items = data_from_elements(link,$rss); // $rss[0] => "http://example.com/rss/"
$items = data_from_elements(link,$rss,true); // $rss[0] => "<link> http://example.com/rss/ </link>"
?>
chasesan at gmail dot com
12-Jul-2006 01:48
12-Jul-2006 01:48
You can use strpos to produce a funciton that will find the nth instance of a certain string within a string. Personally I find this function almost more useful then strpos itself.
I kinda wish they would put it stock into php but I doupt thats gonna happen any time soon. ^_^
Here is da code:
<?php
//just like strpos, but it returns the position of the nth instance of the needle (yay!)
function strpos2($haystack, $needle, $nth = 1)
{
//Fixes a null return if the position is at the beginning of input
//It also changes all input to that of a string ^.~
$haystack = ' '.$haystack;
if (!strpos($haystack, $needle))
return false;
$offset=0;
for($i = 1; $i < $nth; $i++)
$offset = strpos($haystack, $needle, $offset) + 1;
return strpos($haystack, $needle, $offset) - 1;
}
?>
steve at webcommons dot biz
05-Jul-2006 09:56
05-Jul-2006 09:56
If you're wanting a simple "strpos" using a pattern and don't need the complexity of multi_strpos below, this function (for PHP 4.3.0+) returns the regex position.
function preg_pos($sPattern, $sSubject, &$FoundString, $iOffset = 0) {
$FoundString = NULL;
if (preg_match($sPattern, $sSubject, $aMatches, PREG_OFFSET_CAPTURE, $iOffset) > 0) {
$FoundString = $aMatches[0][0];
return $aMatches[0][1];
}
else {
return FALSE;
}
}
It also returns the actual string found using the pattern, via $FoundString.
ludvig dot ericson at gmail dot com
27-Apr-2006 11:28
27-Apr-2006 11:28
As a simplified way of doing what the poster below did:
<?php
$firstName .= '\'';
if (!preg_match('/[sx]$/', $firstName)) {
$firstName .= 's';
}
?>
If you feel using a regular expression is too much, try it - I've not tested yet, but I'd say preg_match() is faster then two strpos() calls.
leibwaechter at web dot de
23-Mar-2006 11:26
23-Mar-2006 11:26
If you only want to look, if a string appears in another string - even at position 0 - , you can also use substr_count():
<?php
$mystring = "Hello Chris";
if (substr_count($mystring, "Hello") == 0)
echo "no";
// same as:
if (strpos($mystring, "Hello") === false)
echo "no";
?>
arachnion at gmail dot com
04-Mar-2006 08:17
04-Mar-2006 08:17
<?php
//use a string as needle, even in PHP 4
//works the same like strrpos()
function stringrpos( $sHaystack, $sNeedle )
{
$i = strlen( $sHaystack );
while ( substr( $sHaystack, $i, strlen( $sNeedle ) ) != $sNeedle )
{
$i--;
if ( $i < 0 )
{
return false;
}
}
return $i;
}
?>
18-Feb-2006 01:48
this works fine:
function getCurrentBrowser() {
$browser = $_SERVER['HTTP_USER_AGENT'];
if (strpos(strtoupper($browser), 'MSIE') !== false) {
return "Internet Explorer";
} else if (strpos(strtoupper($browser), 'FIREFOX') !== false) {
return "Firefox";
} else if (strpos(strtoupper($browser), 'KONQUEROR') !== false) {
return "Konqueror";
} else if (strpos(strtoupper($browser), "LYNX") !== false) {
return "Lynx";
} else {
return $browser;
}
}
if $browser ist
"Lynx/2.8.5rel.2 libwww-FM/2.14 SSL-MM/1.4.1 OpenSSL/0.9.7g"
its work fine, too.
php /at/ da.mcbf.net
15-Feb-2006 05:49
15-Feb-2006 05:49
"fox_galih at yahoo dot co dot uk" example below is absolutely not needed. As the example on this page shows, you can differentiate between position 0 and false by doing a strict comparison (===):
$newsbody = "<p>This is paragraph</p>";
if( strpos( $newsbody, "<p>" ) === 0 ) {
// will only get executed if string starts with <p>
// (false === 0) evaluates to false
}
fox_galih at yahoo dot co dot uk
11-Feb-2006 11:42
11-Feb-2006 11:42
Be carefull when your searching position is in first index. For example:
$newsbody = "<p>This is paragraph</p>";
if( strpos( $newsbody, "<p>" ) == 0 ) {
// do something
}
when strpos returns FALSE, this "if block" will be executed by PHP, because FALSE also has 0 value. So, you have to make it a little bit longer of code:
$pos = strpos( $newsbody, "<p>" );
if ( $pos != FALSE ) {
$pos = strpos( $newsbody, "<p>" );
if( $pos == 0 )
$newsbody = substr( $newsbody, 3 );
}
luko1 at centrum dot cz
03-Feb-2006 02:11
03-Feb-2006 02:11
<?php //prepocet velikosti souboru
function format($soubor) {
$velikost = filesize($soubor);
if($velikost < 1048576):
return number_format(($velikost / 1024), 2, ',', ' ')." kB";
else:
return number_format(($velikost / 1024 / 1024), 2, ',', ' ')." MB";
endif;
}
?>
<?php
function read_dir($dir)
{
$path = opendir($dir);
while (false !== ($file = readdir($path))):
if ($file!="." && $file!=".."):
if (is_file($dir."/".$file)):
$items[] = $file;
else:
$items[] = $dir."/".$file;
endif;
endif;
endwhile;
closedir($path);
if ($items):
natcasesort($items);
foreach ($items as $item){
if (is_dir($item)):
$dir1 = $item;
$item1 = substr($item, strrpos($item, '/') + 1).'/';
echo "<b>$item1</b><table border=1 style='margin-left: 60px; position: static; border: blue'><tr><td>";
read_dir($dir1);
echo "</table>";
else:
$cesta_file = "\"".$dir."/".$item."\"";
$cesta_size = $dir."/".$item;
echo "<span class=pop> <a href=$cesta_file title=$item>$item</a> <span> - ".format($cesta_size)."</span> </span><br>";
endif;
} //endforeach
endif;
}
?>
...
<table><tr><td>
<?php
$dir = ".";
read_dir($dir);
?>
</table>
anonymous at example dot com
02-Feb-2006 05:58
02-Feb-2006 05:58
Beware of following the examples too closely...
$str = "abcdef";
echo strpos($str, 'b'); // outputs 1
however
$str = "abc\nef";
echo strpos($str, '\n'); // output nothing (FALSE)
Not a great way to try to stop PHP email injection attacks (as I found out).
Instead use
strpos($str, "\n")
because the escapes are processed only when using double quotes.
adispam at uid0 dot sk
09-Jan-2006 04:30
09-Jan-2006 04:30
$a="nice string 1234 with number";
$b=sprintf("nice string %d", 1234);
var_dump(strpos($a,$b));
returns FALSE.
substitute : $b=sprintf("nice string %d", 1234);
with: $b = "nice string "; $b.=(string)1234;
and you 'll get correct result (0)
msandersen at t tpg dot com dot au
09-Jan-2006 04:15
09-Jan-2006 04:15
<?PHP
$txt = preg_replace("|(<script.+</script>)|Usi", "", $txt);
?>
No point in keeping empty script tags. Ungreedy will prevent overzealous content removal where there are more than one set of script tags on the page. Multiline has no use here.
Otherwise, if you absolutely must have the empty tags:
<?PHP
$txt = preg_replace("|<script[^>]*>(.+)</script>|Usi", "", $txt);
?>
Martin
samuraj at xmail dot cz
24-Dec-2005 11:38
24-Dec-2005 11:38
there was a code (from wodzuY2k at interia dot pl) removing all between <script> tags..
but it didn't work if the tag begins like <SCRIPT language=javascript type=text/javascript>
here is function removing all between "<script" and "/script>"
<?php
function remove_js($contents)
{
while(true)
{
$begPos = strpos($contents,"<script");
if ($begPos===false) break; //all tags were found & replaced.
$endPos = strpos($contents,"/script>",$begPos+strlen("<script"));
$tmp = substr($contents,0,$begPos);
$tmp .= substr($contents,$endPos+strlen("script>"));
$contents = $tmp;
if ($loopcontrol++>100) break; //loop infinity control
continue; //search again
}
return $contents;
}
?>
Virtual Hunter root(at)autocrash(dot)ru
23-Dec-2005 05:44
23-Dec-2005 05:44
If you want to find positions of all needle's in haystack,
you can use this one:
while (($pos=strpos($haystack,$needle,$pos+1))!==false) $pos_array[$i++]=$pos;
But mind, that it will find from second char. You must use $pos=-1; before you want search from first char.
{
$haystack="one two three one two three one two three one two three one";
$needle="one";
$pos=-1;
while (($pos=strpos($haystack,$needle,$pos+1))!==false) $pos_array[$i++]=$pos;
}
RESULT:
$pos_array[0] = 0
$pos_array[1] = 14
$pos_array[2] = 28
$pos_array[3] = 42
$pos_array[4] = 56
rycardo74 at gmail dot com
22-Nov-2005 07:19
22-Nov-2005 07:19
this function return all src properties from a html text
in array you can filter the specifics html tags with strip_tags
$HTML=strip_tags ( $HTML, '<img>' );
$tag = trip_tag_prop("src=\"" , "\"" , $HTML);
function trip_tag_prop($ini,$end,$HTML ){
$ini_len= strlen($ini);
$end_len= strlen($end);
$inizio_pos=0;
while($inizio_pos = strpos ( $HTML, $ini, $inizio_pos)){
$fine_pos = strpos ( $HTML, $end,($inizio_pos + $ini_len));
$tag[] = substr ( $HTML, $inizio_pos + $ini_len ,($fine_pos - $inizio_pos - $ini_len) );
$inizio_pos=$fine_pos;
}
return $tag;
}
by :Auayama , cabrera rycardo74 (a) gmail (dot) com
csaba at alum dot mit dot edu
21-Nov-2005 04:00
21-Nov-2005 04:00
function nthPos ($str, $needles, $n=1) {
// finds the nth occurrence of any of $needles' characters in $str
// returns -1 if not found; $n<0 => count backwards from end
// e.g. $str = "c:\\winapps\\morph\\photos\\Party\\Phoebe.jpg";
// substr($str, nthPos($str, "/\\:", -2)) => \Party\Phoebe.jpg
// substr($str, nthPos($str, "/\\:", 4)) => \photos\Party\Phoebe.jpg
$pos = -1;
$size = strlen($str);
if ($reverse=($n<0)) { $n=-$n; $str = strrev($str); }
while ($n--) {
$bestNewPos = $size;
for ($i=strlen($needles)-1;$i>=0;$i--) {
$newPos = strpos($str, $needles[$i], $pos+1);
if ($newPos===false) $needles = substr($needles,0,$i) . substr($needles,$i+1);
else $bestNewPos = min($bestNewPos,$newPos); }
if (($pos=$bestNewPos)==$size) return -1; }
return $reverse ? $size-1-$pos : $pos;
}
Csaba Gabor from Vienna
dale at ucsc dot edu
12-Nov-2005 12:28
12-Nov-2005 12:28
if you want need a fast function to find the first occurrence of any ch element of an needle array this function might be of use:
<?php
$eurl = strpos_needle_array($text, array('"'=>0,'\''=>0,'>'=>0, ' '=>0, "\n"=>0), $surl);
function strpos_needle_array(& $text, $needle_ary, $offset=0){
for($ch_pos=$offset;$ch_pos<strlen($text);$ch_pos++){
if(isset($needle_ary[$text[$ch_pos]])){
return $ch_pos;
}
}
return false;
}
?>
johnjc-phpdocs at publicinfo dot net
01-Nov-2005 08:37
01-Nov-2005 08:37
The === and !== are not fully documented in either the Comparison Operator, Booleans type sections. They are talked about a bit more in the sections on strpos() and array_search() but they refer you to the section on Booleans for further information.
I am putting my contribution on === and !== in the Booleans section with pointers to it from the comment areas of other sections.
http://uk.php.net/manual/en/language.types.boolean.php
info at quantummechanic dot com
06-Oct-2005 03:42
06-Oct-2005 03:42
this function takes a space-deliminted string as a list of potential needles and runs it against another string as a haystack.
the number of positive matches of needles within the haystack is returned as a rounded percentile.
function keyMatch($needles,$haystack) {
$nArray=split(" ",$needles);
$found=0;
$best=count($nArray);
for($i=0;$i<count($nArray);$i++) {
$pzn=strpos(strtoupper($haystack),strtoupper($nArray[$i]));
if ($pzn>-1) { $found++; }
}
$pct=($found*100)/$best;
return round($pct);
}
$test = keyMatch("the quick wolf","the quick brown fox jumps over the lazy dog");
echo($test);
RESULT:
67
(because "the" and "quick" were found but "wolf" was not)
paul at goldenbakery dot nl
28-Sep-2005 11:51
28-Sep-2005 11:51
@talthen at wp dot pl
Or you could just have typed:
if (strpos($string,$searchfor)===0)) ....
All you needed was en extra = instead of a whole function.
talthen at wp dot pl
31-Aug-2005 01:48
31-Aug-2005 01:48
Because I like the way pascal functions work, so I created this little function:
function paspos($base,$findme)
{
$result=strpos($base,$findme);
if ($result===false) $result=-1;
return $result;
}
It returns -1 if the $findme may not be found in $base, or position where $findme was found in $base.
Now when you want to check if $base starts from $findme you can just type:
if (paspos($string,$searchfor)==0)) ....
Hope you'll like it :)
lindbeer at gmail dot com
26-Jul-2005 11:29
26-Jul-2005 11:29
He he. I've got an updated version of the multiStrposArray function:
<?php
function multiStrposArray($haystack, $needle) {
return explode($needle, $haystack);
}
?>
vig0
11-Jul-2005 04:03
11-Jul-2005 04:03
This function takes in a string and a delimiter. It then builds an array of the data in between the delimiter then returns the array. I needed this function for something that I'm doing and thought it was somewhat useful.
function multiStrposArray($haystack, $needle){
$array = array();
$row = 0;
$var = "";
for ($i=0; $i<strlen($haystack); $i++) {
if (substr($haystack, $i, 1)==$needle) {
$array[$row] = $var;
$row++;
$var = "";
} else {
$var .= substr($haystack, $i, 1);
}
}
if ($var) $array[$row] = $var;
return $array;
}
Ed Lecky-Thompson
26-Apr-2005 07:02
26-Apr-2005 07:02
Here's a quick function which can replace strtotime, and will work fine on dates pre-1970 (i.e. it will return a negative number as expected).
This negative time stamp seems to be supported as an input parameter by methods like date() up to a point, but if you get crazy and start talking about dates in the 1700s (everybody was using PHP3 back then, of course) it gets upset.
For those of you doing staff databases and so forth, of course, this is probably fine - it's definitely OK for any dates post 1900, and this value has been hard coded into the function below.
function safestrtotime($strInput) {
$iVal = -1;
for ($i=1900; $i<=1969; $i++) {
# Check for this year string in date
$strYear = (string)$i;
if (!(strpos($strInput, $strYear)===false)) {
$replYear = $strYear;
$yearSkew = 1970 - $i;
$strInput = str_replace($strYear, "1970", $strInput);
};
};
$iVal = strtotime($strInput);
if ($yearSkew > 0) {
$numSecs = (60 * 60 * 24 * 365 * $yearSkew);
$iVal = $iVal - $numSecs;
$numLeapYears = 0; # Work out number of leap years in period
for ($j=$replYear; $j<=1969; $j++) {
$thisYear = $j;
$isLeapYear = false;
# Is div by 4?
if (($thisYear % 4) == 0) {
$isLeapYear = true;
};
# Is div by 100?
if (($thisYear % 100) == 0) {
$isLeapYear = false;
};
# Is div by 1000?
if (($thisYear % 1000) == 0) {
$isLeapYear = true;
};
if ($isLeapYear == true) {
$numLeapYears++;
};
};
$iVal = $iVal - (60 * 60 * 24 * $numLeapYears);
};
return($iVal);
};
yess at eleethal dot com
24-Apr-2005 06:18
24-Apr-2005 06:18
Regarding James Perlman's findStr(), it's very nice although doesnt always return true when it should. I found fnmatch() to be a more accurate function for 'wildcard matching'. I'm building an IRCd and require wildmatching for many different commands. Hope this helps somone.
<?
findStr("12.12.12.*","12.12.12.12"); //returns null, should return true
fnmatch("12.12.12.*","12.12.12.12"); //returns 1.
?>
webKami [at] akdomains.com
01-Apr-2005 11:37
01-Apr-2005 11:37
You can easily skip these two meaningless comment lines in my last function.These comments are for old version of the function, I was not using length of needle in that version. Code is fine itself, I suppose ;)
<?
...
//start $pos from -1, cause we are adding 1 into it while searchig
//so the very first iteration will be 0
...
?>
webKami [at] akdomains.com
31-Mar-2005 06:06
31-Mar-2005 06:06
Str Pos Nth (Position of nth occurance of a string)
A handy function to get the position of nth occurance of a substring in a string, with an optional param to make it case insenstive. I am calling it strposnth, suggestions welcome.
Third optional parameter gets the value of n, e.g puting in 2 will return position of second occurance of needle in haystack: Valid inputs (1 = default) 2,3,4.....
Fourth optional parameter can be used to specify the function as case insenstive: Valid inputs (0 = case senstive = default) 1 = case insenstive.
Code:
<?
function strposnth($haystack, $needle, $nth=1, $insenstive=0)
{
//if its case insenstive, convert strings into lower case
if ($insenstive) {
$haystack=strtolower($haystack);
$needle=strtolower($needle);
}
//count number of occurances
$count=substr_count($haystack,$needle);
//first check if the needle exists in the haystack, return false if it does not
//also check if asked nth is within the count, return false if it doesnt
if ($count<1 || $nth > $count) return false;
//run a loop to nth number of accurance
//start $pos from -1, cause we are adding 1 into it while searchig
//so the very first iteration will be 0
for($i=0,$pos=0,$len=0;$i<$nth;$i++)
{
//get the position of needle in haystack
//provide starting point 0 for first time ($pos=0, $len=0)
//provide starting point as position + length of needle for next time
$pos=strpos($haystack,$needle,$pos+$len);
//check the length of needle to specify in strpos
//do this only first time
if ($i==0) $len=strlen($needle);
}
//return the number
return $pos;
}
?>
I just construct this function after trying to search a similar one to use in a shopping cart. I am using this to display a limited number of lines or text for featured products. My aim is to limit the product description to 100 characters or 3 lines / 3 list items whichever is less.
Example code goes like this
<?
//get the product description from recordset
$text=$row['product_desc'];
//strip off text if its longer than 100 characters
if (strlen($text)>100) $text=substr($text,0,100)." ...";
//get ending of the third line
$pos=strposnth($text,"\n",3,1);
//if found, strip off text after that
if($pos) $text=substr($text,0,$pos);
//nl2li (new line 2 list) this function converts the \n seprated lines of text into sorted or unsorted lists
//I have posted this function in nl2br
//http://uk2.php.net/manual/en/function.nl2br.php
$text=nl2li($text);
echo $text;
?>
Examples:
strposnth("I am trying to go now.","o"); // returns 13 (strpos behavior)
strposnth("I am trying to go now.","O"); // returns false (strpos behavior)
strposnth("I am trying to go now.","o",2); // returns 16 (second occurance)
strposnth("I am trying to go now.","o",7); // returns false (occurance count is less than 7)
strposnth("I am trying to go now.","O",1,1); // returns 13 (stripos behavior)
strposnth("I am trying to go now.","O",3,1); // returns 19 (stripos behavior + nth occurance)
Suggestions and corrections are welcome.
Regards,
webKami [at] akdomains.com
edykory at bluebottle dot com
23-Mar-2005 02:49
23-Mar-2005 02:49
a shorter version of "admin at bwongar dot com" searching function:
function strpos_array($haystack, $needle){
while (($pos = strpos($haystack, $needle, $pos)) !== FALSE)
$array[] = $pos++;
return $array;
}
I like "arias" version, but I guess strlen(aguja) can be cached in a local variable.
damy_belthazor86 at yahoo dot it
09-Mar-2005 10:10
09-Mar-2005 10:10
Aw.. I forgot to post the usage of my function :)
Here's an example in which an array is filled of all the values of the attribute src of the tag img.
<?php
$imgSrcValues = getTagAttributeValues($rteHtml,"<IMG","src=");
?>
bye!
08-Mar-2005 02:32
<?
// You can use this to get the real path...
$include_path = getenv("PATH_TRANSLATED");
echo $include_path = substr($include_path, strpos($include_path, "/"), strrpos($include_path, "/"));
?>
arias at elleondeoro dot com
07-Feb-2005 04:33
07-Feb-2005 04:33
If you want to get all positions in an array, you can use this function. If the optional parameter count is especified, the function will put there the number of matches.
function strallpos($pajar, $aguja, $offset=0, &$count=null) {
if ($offset > strlen($pajar)) trigger_error("strallpos(): Offset not contained in string.", E_USER_WARNING);
$match = array();
for ($count=0; (($pos = strpos($pajar, $aguja, $offset)) !== false); $count++) {
$match[] = $pos;
$offset = $pos + strlen($aguja);
}
return $match;
}
admin at bwongar dot com
21-Jan-2005 04:17
21-Jan-2005 04:17
I created a useful function that returns an array with the positions within a string. For more info, read the comments:
<?php
// Returns an array in this fashion:
// array(count => position)
function strpos_array($haystack, $needle){
$kill = 0; // Kills while loop when changed
$offset = 0; // Offset for strpos()
$i = 0; // Counter, not iterator
while ($kill === 0) {
$i++;
$result = strpos($haystack, $needle, $offset);
if ($result === FALSE) { // If result is false (no more instances found), kill the while loop
$kill = 1;
} else {
$array[$i] = $result; // Set array
$offset = $result + 1; // Offset is set 1 character after previous occurence
}
}
return $array;
}
?>
takapz at flor dot it
03-Dec-2004 07:28
03-Dec-2004 07:28
here a little function for tag parsing
function parsing($tag,$string) {
$start=strpos($string,"<" . $tag . ">" );
$start=$start + strlen("<" . $tag . ">");
$end=(strpos($string, "</" . $tag . ">"));
$num= ($end - $start);
$valore=substr($string,$start,$num);
return $valore;
}
ygrange at science dt uva dt nl
14-Sep-2004 02:15
14-Sep-2004 02:15
Hmm. I think the maker of multi_strpos forgot to add that it allowed a negative position (if $n=0, $position[($n-1)] = $position[-1]. I just changed a slightly bit of the code to make it really correct.
I just replace
$position[$n] = (strlen($fragment[0]) + $position[($n-1)]);
by
$position[$n] = (strlen($fragment[0]) + $positione[$n]);
$positione[$n+1]=$position[$n];
philip
26-Aug-2004 01:52
26-Aug-2004 01:52
Many people look for in_string which does not exist in PHP, so, here's the most efficient form of in_string() (that works in both PHP 4/5) that I can think of:
<?php
function in_string($needle, $haystack, $insensitive = 0) {
if ($insensitive) {
return (false !== stristr($haystack, $needle)) ? true : false;
} else {
return (false !== strpos($haystack, $needle)) ? true : false;
}
}
?>
php .at. wwwcrm .dot. com
19-Aug-2004 08:33
19-Aug-2004 08:33
Watch out for type!
The following code will return "not matched", which is a little counter-intuitive.
<?php
$val1=123;
$val2="123,456,789";
if (strpos($val2, $val1)!==false) echo "matched";
else echo "not matched";
?>
When $val1 is cast to string, it behaves as you might expect:
<?php
$val1=(string)123;
$val2="123,456,789";
if (strpos($val2, $val1)!==false) echo "matched";
else echo "not matched";
?>
Hope this saves someone the couple of hours that it took me to spot it :-)
Regards,
Alex Poole
bishop
22-Apr-2004 01:38
22-Apr-2004 01:38
Code like this:
<?php
if (strpos('this is a test', 'is') !== false) {
echo "found it";
}
?>
gets repetitive, is not very self-explanatory, and most people handle it incorrectly anyway. Make your life easier:
<?php
function str_contains($haystack, $needle, $ignoreCase = false) {
if ($ignoreCase) {
$haystack = strtolower($haystack);
$needle = strtolower($needle);
}
$needlePos = strpos($haystack, $needle);
return ($needlePos === false ? false : ($needlePos+1));
}
?>
Then, you may do:
<?php
// simplest use
if (str_contains('this is a test', 'is')) {
echo "Found it";
}
// when you need the position, as well whether it's present
$needlePos = str_contains('this is a test', 'is');
if ($needlePos) {
echo 'Found it at position ' . ($needlePos-1);
}
// you may also ignore case
$needlePos = str_contains('this is a test', 'IS', true);
if ($needlePos) {
echo 'Found it at position ' . ($needlePos-1);
}
?>
amy_w at gmx dot de
02-Apr-2004 08:41
02-Apr-2004 08:41
You can use this function to find ANY occurence of a string in an array - no matter if it is just part of one of the array elements.
it returns the key of the first found occurence or false
<?php
function search_array($needle,$haystacks) {
$found=false;
foreach ($haystacks as $key => $haystack) {
if (!(strpos($haystack,$needle)===false)) {
$found=$key;
break;
}
}
return ($found);
}
?>
ebypdx at comcast dot net
10-Mar-2004 03:26
10-Mar-2004 03:26
counting the occurrences of a substring, recursive-style instead of looping.
<?
function countSubstrs($haystack, $needle)
{
return (($p = strpos($haystack, $needle)) === false) ? 0 : (1 + countSubstrs(substr($haystack, $p+1), $needle));
}
?>
kingbusiness at hotmail dot com
18-Dec-2003 08:34
18-Dec-2003 08:34
A simple function to find the number of occurances in a string within a string
<?php
function StringCount($searchstring, $findstring)
{
return (strpos($searchstring, $findstring) === false ? 0 : count(split($findstring, $searchstring)) - 1);
}
?>
justin at visunet dot ie
01-Oct-2003 07:20
01-Oct-2003 07:20
Function:
stripos_words($haystack,'words in string')
This function finds and reports positions of all words in supplied haystack. It returns the results as an array. The array has the following structure.
Array
(
[69] => Array
(
[start] => 69
[end] => 74
[word] => honey
)
[226] => Array
(
[start] => 226
[end] => 232
[word] => cobweb
)
}
Where, for convenience, the main key also contains the positions of each found word occurrence.
If you want the main key to be 0,1,2,3,etc then set the third parameter ($pos_as_key) to false;
Hope this is of help to someone.
Cheers,
Justin :)
<?php
function stripos_words($haystack,$needles='',$pos_as_key=true)
{
$idx=0; // Used if pos_as_key is false
// Convert full text to lower case to make this case insensitive
$haystack = strtolower($haystack);
// Split keywords and lowercase them
foreach ( preg_split('/[^\w]/',strtolower($needles)) as $needle )
{
// Get all occurences of this keyword
$i=0; $pos_cur=0; $pos_found=0;
while ( $pos_found !== false && $needles !== '')
{
// Get the strpos of this keyword (if thereis one)
$pos_found = strpos(substr($haystack,$pos_cur),$needle);
if ( $pos_found !== false )
{
// Set up key for main array
$index = $pos_as_key ? $pos_found+$pos_cur : $idx++;
// Populate main array with this keywords positional data
$positions[$index]['start'] = $pos_found+$pos_cur;
$pos_cur += ($pos_found+strlen($needle));
$positions[$index]['end'] = $pos_cur;
$positions[$index]['word'] = $needle;
$i++;
}
}
}
// If we found anything then sort the array and return it
if ( isset($positions) )
{
ksort($positions);
return $positions;
}
// If nothign was found then return false
return false;
}
?>
arduenn at hotpop dot com
18-Jan-2003 02:45
18-Jan-2003 02:45
Hi all,
This function returns an array of positions (as integers) of a regular expression pattern that could occur several times within a string (or FALSE if the pattern does not occur). Note that the function is able to determine the positions of overlapping patterns. There may be shorter ways of determining multiple pattern positions (such as by using 'explode') but likely these won't find the overlapping patterns.
The multi_strpos function has one restriction (for the sake of snippet economy): if you use a pattern starting with '\*' (backslash asterisk) a hit within the string will invoke an infinite loop.
This function was initially written to create restriction maps of DNA sequences but you may find other uses.
<?
function multi_strpos($pattern, $sequence) {
$n = -1;
while (ereg($pattern, $sequence)) {
$n++;
$fragment = split($pattern, $sequence);
$trimsize = (strlen($fragment[0]))+1;
$sequence = "*".substr($sequence, $trimsize);
$position[$n] = (strlen($fragment[0]) + $position[($n-1)]);}
return $position;}
// Below some code to demonstrate the function.
$testsequence = "She sells sea shells at the see shore.";
echo "Test sequence = '$testsequence'\n\n";
$testpattern = "s...s";
echo "Regular expression pattern = '$testpattern'\n\n";
$position = multi_strpos($testpattern, $testsequence);
if ($position) {
echo "Pattern match found at:\n";
while (list($index, $pos) = each($position)) {
echo "$pos\n";}}
?>