imagestringup

imagesettile

Last updated: Fri, 30 Jan 2009

imagestring

(PHP 4, PHP 5)

imagestring — 文字列を水平に描画する

説明

bool imagestring ( resource $image , int $font , int $x , int $y , string $string , int $color )

指定した座標に文字列 string を描画します。

パラメータ

image: imagecreatetruecolor() のような画像作成関数が返す画像リソース。
font: latin2 エンコーディングの組み込みのフォントの場合は 1, 2, 3, 4, 5 のいずれか (数字が大きなほうが、より大きいフォントに対応します)、あるいは imageloadfont() で登録したフォントの識別子のいずれか。
x: 左上隅の x 座標。
y: 左上隅の y 座標。
string: 書き出す文字列。
color: imagecolorallocate() で作成した色 ID。

返り値

成功した場合に TRUE を、失敗した場合に FALSE を返します。

例

例1 imagestring() の例


<?php
// 100*30 の画像を生成します
$im = imagecreate(100, 30);

// 白色の背景と青色のテキスト
$bg = imagecolorallocate($im, 255, 255, 255);
$textcolor = imagecolorallocate($im, 0, 0, 255);

// 左上に文字列を描画します
imagestring($im, 5, 0, 0, "Hello world!", $textcolor);

// 画像を出力します
header("Content-type: image/png");

imagepng($im);
imagedestroy($im);
?>

上の例の出力は、たとえば以下のようになります。

参考

imageloadfont() - 新しいフォントを読み込む
imagettftext() - TrueType フォントを使用してテキストを画像に書き込む

imagestringup

imagesettile

Last updated: Fri, 30 Jan 2009

add a note User Contributed Notes
imagestring

mike at mike-griffiths dot co dot uk
19-Dec-2008 10:07


I created an alternative using the function imagechar to create a string of an image.  The below function below was used to create an image the same height and width of the text string.  It is used on my website (http://www.beatspot.co.uk) to mask users email addresses.



<?PHP



// Set your string somehow

$string = 'your@email.com';



// Set font size

$font_size = 4;



// Create image width dependant on width of the string

$width  = imagefontwidth($font_size)*strlen($string);

// Set height to that of the font

$height = imagefontheight($font_size);

// Create the image pallette

$img = imagecreate($width,$height);

// Grey background

$bg    = imagecolorallocate($img, 25, 25, 25);

// White font color

$color = imagecolorallocate($img, 255, 255, 255);

// Length of the string

$len = strlen($string);

// Y-coordinate of character, X changes, Y is static

$ypos = 0;

// Loop through the string

for($i=0;$i<$len;$i++){

    // Position of the character horizontally

    $xpos = $i * imagefontwidth($font_size);

    // Draw character

    imagechar($img, $font_size, $xpos, $ypos, $string, $color);

    // Remove character from string

    $string = substr($string, 1);    

    

}

// Return the image

header("Content-Type: image/gif");

imagegif($img);

// Remove image 

imagedestroy($img);



?>

keksnicoh at googlemail dot com
02-Nov-2008 08:42


Some fun with imagestring:



This function is a product of too much time..

It opens an image and create a new image with one letter instead of a pixel.



<?php

error_reporting(E_ALL);

/**

 * generates a image with chars instead of pixels

 *

 * @param string $url Filepath or url

 * @param string $chars The chars which should replace the pixels

 * @param int $shrpns Sharpness (2 = every second pixel, 1 = every pixel ... )

 * @param int $size 

 * @param int $weight font-weight/size

 * @return sesource

 * @author Nicolas 'KeksNicoh' Heimann <www.salamipla.net>

 * @date 02nov08

 */

function pixelfuck($url, $chars='ewk34543§G§$§$Tg34g4g', $shrpns=1, $size=4,$weight=2)

{

    list($w, $h, $type) = getimagesize($url);

    $resource = imagecreatefromstring(file_get_contents($url));

    $img = imagecreatetruecolor($w*$size,$h*$size);



    $cc = strlen($chars);

    for($y=0;$y <$h;$y+=$shrpns) 

        for($x=0;$x <$w;$x+=$shrpns)

            imagestring($img,$weight,$x*$size,$y*$size, $chars{@++$p%$cc}, imagecolorat($resource, $x, $y));

    return $img;

}



$url = 'http://upload.wikimedia.org/wikipedia/commons/b/be/Manga_Icon.png';

$text = 'I-dont-like-manga-...-Why-do-they-have-such-big-eyes? Strange-...-WHAT-WANT-YOU-DO?';



Header('Content-Type: image/png');

imagepng(pixelfuck($url, $text, 1, 6));

?>



Have fun  :)

Abubaker dot shamlan at gmail dot com
20-Aug-2008 01:02


this is a function that is based on imagestring but it produces text in the center of an image i hope it helps :D





<?php


function ImageStringCenter($image_resource, $font_size, $line_number, $total_lines, $text, $color ) {





    $center_x = ceil( ( imagesx($image_resource) - ( ImageFontWidth($font_size) * strlen($text) ) ) / 2 );





    $center_y = ceil( ( ( imagesy($image_resource) - ( ImageFontHeight($font_size) * $total_lines ) ) / 2)  + ( ($line_number-1) * ImageFontHeight($font_size) ) );





ImageString($image_resource, $font_size, $center_x, $center_y, $text, $color );





}


?>

mustafa at hafunny dot info
14-Aug-2008 12:42


If you have any problem with CentralEurope's words, for example : ľščťžýáíéúäňôď, I am try this problem by iconv() function.



<?php

// create example image

$im = imagecreate(200, 20);

$bg = imagecolorallocate($im, 255, 255, 255);

$textcolor = imagecolorallocate($im, 0, 0, 255);

$text = "ľščťžýáíéúäňôď...";



//simple convert string

$string = iconv("Windows-1250", "Latin2", $text);



// write converted string at the top left

imagestring($im, 4, 0, 0, $string, $textcolor);



// output the image

header("Content-type: image/png");

imagepng($im);

?>

sk89q
15-Mar-2008 12:10


Creates a box of text. Has horizontal and vertical alignment, box arguments, and custom leading. I submitted this to the manual in 2003 actually, but it disappeared after a year or so (not sure why). Here it is again.



<?php

define("ALIGN_LEFT", "left");

define("ALIGN_CENTER", "center");

define("ALIGN_RIGHT", "right");

define("VALIGN_TOP", "top");

define("VALIGN_MIDDLE", "middle");

define("VALIGN_BOTTOM", "bottom");



function imagestringbox(&$image, $font, $left, $top, $right, $bottom, $align, $valign, $leading, $text, $color)

{

   // Get size of box

   $height = $bottom - $top;

   $width = $right - $left;

  

   // Break the text into lines, and into an array

   $lines = wordwrap($text, floor($width / imagefontwidth($font)), "\n", true);

   $lines = explode("\n", $lines);

  

   // Other important numbers

   $line_height = imagefontheight($font) + $leading;

   $line_count = floor($height / $line_height);

   $line_count = ($line_count > count($lines)) ? (count($lines)) : ($line_count);

  

   // Loop through lines

   for ($i = 0; $i < $line_count; $i++)

   {

       // Vertical Align

       switch($valign)

       {

           case VALIGN_TOP: // Top

               $y = $top + ($i * $line_height);

               break;

           case VALIGN_MIDDLE: // Middle

               $y = $top + (($height - ($line_count * $line_height)) / 2) + ($i * $line_height);

               break;

           case VALIGN_BOTTOM: // Bottom

               $y = ($top + $height) - ($line_count * $line_height) + ($i * $line_height);

               break;

           default:

               return false;

       }

      

       // Horizontal Align

       $line_width = strlen($lines[$i]) * imagefontwidth($font);

       switch($align)

       {

           case ALIGN_LEFT: // Left

               $x = $left;

               break;

           case ALIGN_CENTER: // Center

               $x = $left + (($width - $line_width) / 2);

               break;

           case ALIGN_RIGHT: // Right

               $x = $left + ($width - $line_width);

               break;

           default:

               return false;

       }

      

       // Draw

       imagestring($image, $font, $x, $y, $lines[$i], $color);

   }

  

   return true;

}

?>

Anonymous
30-Jan-2008 07:31


<?php



header("Content-type: image/png");

$string = $_GET['text'];

$im     = imagecreatefrompng("button1.png");

$color = imagecolorallocate($im, 0, 0, 0);

$px     = (imagesx($im) - 7.5 * strlen($string)) / 2;

imagestring($im, 3, $px, 9, $string, $color);

imagepng($im);

imagedestroy($im);



?> 



this code you can write the string within the url by a $_get function

Tobias
17-Jan-2008 11:40


I've taken the code of Epidemiah and improved the code so that the function now can handle generic position commands (as e.g. left / bottom) or int-values as left/top position of the text to write (with positive values used as left/top position and negative from right/bottom).



So e.g. imageWriteString($img, $font, $text, $color, -10,-10); writes the text so that there is 10 px space to right and bottom border of image.



Hope this is useful. Could be optimized and checked in detail, but works fine for me.



Tobias



<?php



/**

 * write text at a specified position of the image

 * @source: http://de.php.net/manual/en/function.imagestring.php#80186

 *

 * @param &$img; reference to image

 * @param $font font to use

 * @param $text text to write

 * @param $color color to use

 * @param $position_x var if numeric: write starting at position x (if x >= 0), otherwise from right border; possible string values: left(5px from left border), right(5px from right border), center(default)

 * @param $position_y var if numeric: write starting at position y (if y >= 0), otherwise from bottom; possible string values: top(5px from top border), bottom(5px from bottom border), center(default)

 * @return void

 */

function imageWriteString(&$img, $font, $text, $color, $position_x = 'center', $position_y = 'center') {

    // initialize internal variables

    $x = null;

    $y = null;



    if($font < 0 || $font > 5){ $font = 0; }

    $num = array(array(4.6, 6),

                 array(4.6, 6),

                 array(5.6, 12),

                 array(6.5, 12),

                 array(7.6, 16),

                 array(8.5, 16));



    $width = ceil(strlen($text) * $num[$font][0]);

    $height = $num[$font][1] + 2;



    // handle position x

    if (is_string($position_x)) {

        switch($position_x) {

            case 'left':

                $position_x = 5;

                break;

            case 'right':

                $position_x = -5;

                break;

            default:

            case 'center':

                $x     = (imagesx($img) - $width - 8) / 2;

                break;

        }

    }

    if (!isset($x)) {

        if(is_numeric($position_x)) {

            if ($position_x >= 0) {

                $x = $position_x; // left

            } else {

                $x = imagesx($img) - $width + $position_x - 8; // right

            }

        } else {

            $x     = (imagesx($img) - $width - 8) / 2; // default / error value: center

        }

    }



    // handle position y

    if (is_string($position_y)) {

        switch($position_y) {

            case 'top':

                $position_y = 5;

                break;

            case 'bottom':

                $position_y = -5;

                break;

            default:

            case 'center':

                $y     = (Imagesy($img) - ($num[$font][1] + 2))/2;

                break;

        }

    }

    if (!isset($y)) {

        if (is_numeric($position_y)) {

            if ($position_y >= 0) {

                $y = $position_y; // top

            } else {

                $y = Imagesy($img) - $height + $position_y; // bottom

            }

        } else {

            $y     = (Imagesy($img) - ($num[$font][1] + 2))/2; // default / error value: center

        }

    }

    imagestring($img, $font, $x, $y, $text, $color);

}

?>

eviloverlord+php at gmail dot com
04-Jan-2008 01:28


Simple script to convert a string (such as an email addresses) to a transparent image.



Usage: 

<img src="stringtoimg.php?string=<?= urlencode(base64_encode($email)) ?>">



From a spambot's point of view, they see:

<img src="stringtoimg.php?string=ZpbXZG92ZXJsb3JkQGdtYWlsLmNvbQ%3D%3D">



Optional parameters:

    font_size: 1 to 5, with the default at 3

    R/G/B: the font color, in hex.



Usage:

<img src="stringtoimg.php?string=<?= urlencode(base64_encode($email)) ?>&font_size=4&R=FF&G=FF&B=00">



<?php

/*

Filename: stringtoimg.php



Parameters:

        string: the string to print

        font_size (optional): the size of the font from 1-5

        R/G/B (optional): the RGB colors of the font in hex       

*/



header ("Content-type: image/png");



//Get string info

$font_size = isset($_GET['font_size']) ? $_GET['font_size'] : 3;

$string = urldecode(base64_decode($_GET['string']));



//Get the size of the string

$width = imagefontwidth($font_size) * strlen($string);

$height = imagefontheight($font_size);



//Create the image

$img = @imagecreatetruecolor($width, $height)

      or die("Cannot Initialize new GD image stream");



//Make it transparent

imagesavealpha($img, true);

$trans_colour = imagecolorallocatealpha($img, 0, 0, 0, 127);

imagefill($img, 0, 0, $trans_colour);



//Get the text color

$text_color = isset($_GET['R'], $_GET['G'], $_GET['B']) ?

        imagecolorallocate($img, hexdec($_GET['R']), hexdec($_GET['G']), hexdec($_GET['B'])) :

        imagecolorallocate($img, 0, 0, 0);



//Draw the string

imagestring($img, $font_size, 0, 0,  $string, $text_color);



//Output the image

imagepng($img);

imagedestroy($img);

?>

Epidemiah
03-Jan-2008 03:06


Its just an easy function to write an string in the middle of a picture.



<?php



function imageCenterString(&$img, $font, $text, $color)

{

    if($font < 0 || $font > 5){ $font = 0; }

    $num = array(array(4.6, 6),

                 array(4.6, 6),

                 array(5.6, 12),

                 array(6.5, 12),

                 array(7.6, 16),

                 array(8.5, 16));

    $width = ceil(strlen($text) * $num[$font][0]);

    $x     = imagesx($img) - $width - 8;

    $y     = Imagesy($img) - ($num[$font][1] + 2);

    imagestring($img, $font, $x/2, $y/2, $text, $color);

}



?>

jlamer
19-Feb-2007 04:00


//  Example of use...



//  This is a simple function to output text to an image

//  which is centered (as much as I want to do by eye)

//  and wrapped

//    Just remember that all the sizes are guessed

// doesn't cut on the space (only on number of characters)

//  or change color of text, but this isn't for that...

function imageCenterString( $imgw, $imgh,

   $image_text = '', $text_size=5 )

{

   $im = imagecreate( $imgw, $imgh );

    

   // white background and blue text

   $bg = imagecolorallocate($im, 255, 255, 255);

   $textcolor = imagecolorallocate($im, 0, 0, 0);

    

   $t_h = $t_w = $t_x = $t_y = 0;

   $base_w =9; $base_h = 16;

   $m = 0.88;

   switch ( $text_size )

   {

      case 1: $t_w = $base_w*pow(($m*.98),4);

         $t_h = $base_h*pow(($m*.98),4);

         break;

      case 2: $t_w = $base_w*pow($m,3);

         $t_h = $base_h*pow($m,3);

         break;

      case 3: $t_w = $base_w*pow($m,2);

         $t_h = $base_h*pow($m,2);

         break;

      case 4: $t_w = $base_w*$m;

         $t_h = $base_h*$m;

         break;

      case 5: $t_w = $base_w;

         $t_h = $base_h;

         break;

      default:

         if ( $text_size >= 5 ) // set to 5

         {   $t_w = $base_w; $t_h = $base_h; }

         if ( $text_size < 5 ) // set to 1

         {

            $t_w = $base_w*pow(($m*.98),4);

            $t_h = $base_h*pow(($m*.98),4);

         }

         break;

   }

    

   $text_array = array();

    

   $max = floor($imgw/$t_w);

    

   for( $i=0; strlen($image_text) > 0; $i += $max)

   {

      array_push($text_array, substr($image_text,0,$max));

      if ( strlen($image_text) >= $max )

      {   $image_text = substr($image_text,$max); }

      else

      {   $image_text = ''; }

   }

    

   $t_y = ($imgh/2) - ($t_h*count($text_array)/2);



   foreach ( $text_array as $text )

   {

      $t_x = ($imgw/2)-($t_w*strlen($text)/2);

      imagestring($im, $text_size, $t_x, $t_y,

         $text, $textcolor);

      $t_y += $t_h;

   }



   // output the image

   header("Content-type: image/gpeg");

   imagejpeg($im);

}

gannon (at) portablesofdoom (dot) org
28-Dec-2006 04:53


I like this better than "tjpoe at cableaz dot com"'s function for wrapping text to fit width (auto-adjusts height as needed) since it doesn't only do 1 word per line.



function make_wrapped_txt($txt, $color=000000, $space=4, $font=4, $w=300) {

  if (strlen($color) != 6) $color = 000000;

  $int = hexdec($color);

  $h = imagefontheight($font);

  $fw = imagefontwidth($font);

  $txt = explode("\n", wordwrap($txt, ($w / $fw), "\n"));

  $lines = count($txt);

  $im = imagecreate($w, (($h * $lines) + ($lines * $space)));

  $bg = imagecolorallocate($im, 255, 255, 255);

  $color = imagecolorallocate($im, 0xFF & ($int >> 0x10), 0xFF & ($int >> 0x8), 0xFF & $int);

  $y = 0;

  foreach ($txt as $text) {

    $x = (($w - ($fw * strlen($text))) / 2);

    imagestring($im, $font, $x, $y, $text, $color);

    $y += ($h + $space);

  }

  header('Content-type: image/jpeg');

  die(imagejpeg($im));

}

iibm at free dot fr
14-Dec-2006 12:21


I've made a little modification of the (quite usefull) imagestringcutted function (when align=center, it doesn't work well for me if x1!=0) so juste replace the last line with :



<?php

   [...]

   else imagestring($img,$font,$x1+($x2-$x1)/ 2 - strlen($text) * $fontwidth / 2,$y,$text,$color);

}

?>

Piotr dot Sulecki at traxelektronik dot pl
09-Nov-2006 01:18


The built-in fonts used to be in latin-2 (iso8859-2) encoding. For some time, they are in latin-1 (iso8859-1) encoding. There is no way to change the encoding at all. If you need to use any other encoding, you have to use TrueType fonts.

god at in-heaven dot org
19-Oct-2006 12:47


Here's a simple function for creating an aligned string which is cutted to match the space between $x1 and $x2

<?php

function imagestringcutted($img,$font,$y,$x1,$x2,$text,$color,$align="center") {

    $fontwidth = imagefontwidth($font);

    $fullwidth = strlen($text) * $fontwidth;

    $maxwidth = $x2-$x1;

    $targetwidth = $fullwidth-(4*$fontwidth);

    if($fullwidth > $maxwidth) {

        for($i = 0; $i < strlen($text) AND ((strlen($text)-($i-4))*$fontwidth) > $targetwidth ;$i++) { }

        $text = substr($text,0,(strlen($text)-$i)-4)."...";

    }

    if($align == "left") imagestring($img,$font,$x1,$y,$text,$color);

    elseif($align == "right") imagestring($img,$font,$x2 - ((strlen($text) * $fontwidth)),$y,$text,$color);

    else imagestring($img,$font,($x2-$x1)/ 2 - strlen($text) * $fontwidth / 2,$y,$text,$color);

}

?>

Usage:

<?php

imagestringcutted($img,$font,$y,$x1,$x2,$text,$color,$align);

?>

Will create a string $text, which is cutted if it's too long to match between  $x1 and $2, on $img with font $font and color $color at height $y and with align to $align.

Hope it will help some people.

Sorry for my bad English.

rush at 507magazine dot com
28-Feb-2006 09:54


hello, I noticed that if you put a rand(3,5) it will put random sizes of font to each character put on the image. this is very useful when programming captchas for anti-spam form verification.

julien / at / theoconcept.com
02-Feb-2006 01:21


If you are looking for a way to generate a "CAPTCHA" image for a form verification (to verify it is not a robot), have a look at this : http://blog.theoconcept.com/static/distortion/



It gives an animated image with the parameter string, with distortion, here is an example :

http://blog.theoconcept.com/static/distortion/distortion.php



(*)  You'll need GD + Freetype support

(**) You'll need ImageMagick on the machine

m dot onderwater at esperantoxl dot nl
05-Dec-2005 08:55


There is a small error in the function for horizontal and vertical centering by "jurgen dot vanoosterwijck at pandora dot be"



the line 



 $cy = (imagesy($img)/2) - (imagefontwidth($font)/2);



should be



 $cy = (imagesy($img)/2) - (imagefontheight($font)/2);

aly at slo-igre dot net
11-Jun-2005 11:12


There is an error in "tjpoe at cableaz dot com" 's function ImageStringWrap. Instead of 



    else

           $string = $text;



there should be



     else

           $string = array($text);



for function to work for strings with only one word. Otherwise it works like a charm, thanks.

tjpoe at cableaz dot com
28-May-2005 05:48


i modified the centering functions and created this which centers each word on it's own line. You can adjust the spacing with the $valign var. currently no implimentation if text is too large for image. strings are tokenized by space, but can obviously be changed. 



function ImageStringWrap($image, $font, $text, $color)

{

  $fontwidth = ImageFontWidth($font);

  $fontheight = ImageFontHeight($font);

  $words= str_word_count($text);

  if ($words > 1){

    $string=array(strtok($text,' '));

    for ($i = 1 ; $i <= $words ; $i++){

      $string=array_merge($string,array($i=>strtok(' ')));

    }

  }

  else

    $string=$text;

  $vspace=4;

  $y=((imagesy($image)-($fontheight*$words)-($words*$vspace))/2);

  foreach($string as $st){

    $x=((imagesx($image)-($fontwidth * strlen($st)))/2);

    ImageString($image,$font,$x,$y,$st,$color);

    $y+=($fontheight+$vspace);

  }

}

hope this is helpful

bpgordon at gmail dot com
24-May-2005 02:04


This code produces a png image of the text within the query. It autofits to the length of the string. 

Usage: http://yoursite.com/text.php?abcdefg+hijk



Use + to produce a space in the image. The + can be excaped with a carat (^). Most other symbols work fine in the query string, like the ?.



<?php

header ("Content-type: image/png");

$string = $_ENV["QUERY_STRING"];

$md5 = md5($string); //just so we don't convert valid text into a +

$string = str_replace("^+", $md5, $string); //replaces ^+ with long, unnatural string

$string = str_replace("+", " ", $string); //replaces + with space

$string = str_replace($md5, "+", $string); //replaces the long, unnatural string with +

$width  = imagefontwidth($font) * strlen($string);

$height = imagefontheight($font);

$image = @imagecreate($width+2, $height+2);

$black = imagecolorallocate($image, 0, 0, 0); //background

$white = imagecolorallocate($image, 255, 255, 255);

imagestring($image, 2, 1, 1,  $string, $white);

imagepng($image);

imagedestroy($image);

?>

jurgen dot vanoosterwijck at pandora dot be
12-May-2005 08:52


Based on the previous example, here's how to center a string both horizontally and vertically...



<?php

function imagestringcentered ($img,$font,$text,$color) {

 while (strlen($text) * imagefontwidth($font) > imagesx($img)) {

  if ($font > 1) { $font--; }

  else { break; }

 } 

 $cy = (imagesy($img)/2) - (imagefontwidth($font)/2);

 imagestring($img,$font,imagesx($img) / 2 - strlen($text) * imagefontwidth($font) / 2,$cy,$text,$color);

}

?>

shadikka at gmail dot com
26-Mar-2005 09:49


My version of the centered string, it decreases the font number (since I've noticed smaller numbers are smaller fonts) until 1 if the string won't fit. Then it will give up.



<?php

function imagestringcentered ($img,$font,$cy,$text,$color) {

 while (strlen($text) * imagefontwidth($font) > imagesx($img)) {

  if ($font > 1) { $font--; }

  else { break; }

 }  

 imagestring($img,$font,imagesx($img) / 2 - strlen($text) * imagefontwidth($font) / 2,$cy,$text,$color);

}

?>

webmaster at acdrifter dot com
01-Mar-2005 06:08


If you are looking to center the text, use the following function; I'm not promising perfection...



function imagecenteredstring ( &$img, $font, $xMin, $xMax, $y, $str, $col ) {

    $textWidth = imagefontwidth( $font ) * strlen( $str );

    $xLoc = ( $xMax - $xMin - $textWidth ) / 2 + $xMin + $font;

    imagestring( $img, $font, $xLoc, $y, $str, $col );

}

cesargus at yahoo dot com
17-Nov-2004 08:27


//simple hello world



<?

header ("Content-type: image/png");



$img_handle = ImageCreate (200, 20) or die ("Cannot Create image");

$back_color = ImageColorAllocate ($img_handle, 0, 10, 10);

$txt_color = ImageColorAllocate ($img_handle, 235, 235, 51);

ImageString ($img_handle, 10, 25, 5,  "Hello world!", $txt_color);

ImagePng ($img_handle); 

?>

brooks dot boyd at gmail dot com
13-Oct-2004 10:35


Drawing a string as an image is a handy way to disguise an eMail address so spam sniffers can't get it as easily. The only catch to creating a dynamic image with your eMail in it is the eMail to be displayed must be passed via the query string to enable static HTML to use it. So, the eMail must be encrypted slightly in order to not defeat the purpose of not typing your eMail address outright. I wrote the following script to do so:



Save the following as email.php

<?php

    if ($_GET['addr'] != "") {

        $msg = $_GET['addr'];

        $msg = preg_replace("/\[dot]/",".",$msg);

        $msg = preg_replace("/\[at]/","@",$msg);

        $final = "";

        for ($i=0; $i<=strlen($msg); $i++) {

            $final .= substr($msg, strlen($msg)-$i, 1);

        }

        $msg = $final;



        $char_width = 8;

        $char_height = 17;

        $padding = 3;

        $width = $padding*2+strlen($msg)*$char_width;

        $height = +$padding*2+$char_height;

        $im = imagecreatetruecolor($width,$height);

        imagealphablending($im, FALSE);

        imagesavealpha($im, TRUE);

        $bg = imagecolorallocatealpha($im, 255, 255, 0, 100);

        $text = imagecolorallocatealpha($im, 0, 0, 0, 0);

        imagefilledrectangle ($im, 0, 0, $width, $height, $bg); # Make transparent

        imagestring($im, 4, $padding, $padding, $msg, $text);

    } else {

        $im = imagecreatetruecolor(1,1);

        imagealphablending($im, FALSE);

        imagesavealpha($im, TRUE);

        $bg = imagecolorallocatealpha($im, 255, 0, 0, 125);

        imagefilledrectangle ($im, 0, 0, 1, 1, $bg); # Make transparent

    }

    header('Content-type: image/jpg');

    imagepng($im);

    imagedestroy($im);



?>



If the script is called without an eMail address, it outputs a 2x2 transparent image.



To call the script to generate the eMail "user@home.com", the HTML tag would be:



<img src="email.php?addr=moc[dot]emoh[at]resu">



To 'encrypt' the eMail address to pass to the script, write the address backwards and replace "." with "[dot]" and "@" with "[at]". It's not the most ironclad protection, but it thwarts most casual eMail sniffers.

php dot net at mvoncken dot nl
15-Feb-2003 12:18


A simple example:

To make one line of text fit in the image.



<?php

header ("Content-type: image/png");

$string = "spam@mvoncken.nl";                                              

$font   = 4;

$width  = ImageFontWidth($font) * strlen($string);

$height = ImageFontHeight($font);



$im = @imagecreate ($width,$height);

$background_color = imagecolorallocate ($im, 255, 255, 255); //white background

$text_color = imagecolorallocate ($im, 0, 0,0);//black text

imagestring ($im, $font, 0, 0,  $string, $text_color);

imagepng ($im);

?>



I use something like this for spamprotection of my visitors (pass userid as an url-parameter for this php)

aholmes84 at hotmail dot com
08-Nov-2002 09:25


When setting the font, any integer less than 1 defaults to 1, and any integer greater than 5 defaults to 5.

deejay_world at yahoo dot com
11-Jun-2002 05:25


Width ImageString, the strings you draw are not automatically wrapped width the edge of the image. You may use this function to automatically wrap them:



function ImageStringWrap($image, $font, $x, $y, $text, $color, $maxwidth)

{

    $fontwidth = ImageFontWidth($font);

    $fontheight = ImageFontHeight($font);



    if ($maxwidth != NULL) {

        $maxcharsperline = floor($maxwidth / $fontwidth);

        $text = wordwrap($text, $maxcharsperline, "\n", 1);

      }



    $lines = explode("\n", $text);

    while (list($numl, $line) = each($lines)) {

        ImageString($image, $font, $x, $y, $line, $color);

        $y += $fontheight;

      }

}



So, in particular, if you want to wrap a text with the edge of the Image, you may do:

ImageStringWrap($img, $font, 0, $y, $text, $color, ImageSX($img) );

bob dot brown at opus dot co dot nz
03-Apr-2002 02:59


If you find that you are getting two characters on the end of your imageString that look like a Y and an upside down L then they're probably representations of CR/LF.  Try trim()ing the string before outputting it.  (I was sooo sure this was a bug <g>)

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Last updated: Fri, 30 Jan 2009