syslog

(PHP 4, PHP 5)

syslog — Genera un messaggio del system log

Descrizione

int syslog ( int $priorità , string $messaggio )

syslog() genera un messaggio di log che viene distribuito dal logger di sistema. priorità è la combinazione della facility e del livello, valori utilizzabili sono riportati nella prossima sezione. L'argomento rimanente è il messaggio da inviare, eccetto i due caratteri %m che vengono sostituiti dalla stringa del messaggio di errore (strerror) corrispondente all'attuale valore di errno.

**Priorità **syslog()** (in ordine discendente)**
Costante	Descrizione
LOG_EMERG	sistema non utilizzabile
LOG_ALERT	azione da intraprendere immediatamente
LOG_CRIT	condizioni critiche
LOG_ERR	condizioni di errore
LOG_WARNING	condizioni di attenzione
LOG_NOTICE	condizione normale, ma significativa
LOG_INFO	messaggio di informazione
LOG_DEBUG	messaggio a livello di debug

Example #1 Uso di syslog()


<?php
define_syslog_variables();
// apre il syslog, include l'ID del processo, invia il
// log anche su standard error e fa uso di un meccanismo
// di logging defiito dall'utente
openlog("IlMioLog", LOG_PID | LOG_PERROR, LOG_LOCAL0);

// un po' di codice

if (client_autorizzato()) {
    // fa qualcosa
} else {
    // client non autorizzato!
    // logga il tentativo
    $accesso = date("Y/m/d H:i:s");
    syslog(LOG_WARNING,"Client non autorizzato: $accesso $REMOTE_ADDR ($HTTP_USER_AGENT)");
}

closelog();
?>

Per informazioni su come creare un gestore di log definito dall'utente, fare riferimento alla man page syslog.conf (5) di Unix. Ulteriori informazioni sulle facility di syslog e sulle sue opzioni possono essere trovate sulle macchine Unix nelle man page di syslog (3).

Su Windows NT, il servizio syslog è emulato usando Event Log.

Vedere anche define_syslog_variables(), openlog() e closelog().

SAM

Network Funzioni

Last updated: Fri, 18 Jul 2008

add a note User Contributed Notes
syslog

james dot ellis at gmail dot com
03-Dec-2007 06:26


If anyone is wondering why their log messages are appearing in multiple log files, here is one answer applying to *nix systems:



If your syslog.conf looks like this (assuming you use LOG_LOCAL0 for web app logging) :



local0.info    /var/log/web/info.log



This will collect *all* messages of LOG_INFO level and higher, i.e everything except debug messages



Try this instead to ensure that only messages of the named log level go into the relevant log file:



local0.=info    /var/log/web/info.log



Additionally, you may like to add this to ensure your messages don't end up in generic log files like "messages"  "all" "syslog" and "debug":



local0.none    /var/log/messages

local0.none    /var/log/debug

etc



saves disk space among other things - more at "man syslog.conf"

helly at php dot net
13-Apr-2007 03:49


If you are using syslog-ng and want errors send to syslog then use ini setting "error_log = syslog" and add something like the following to your syslog-ng.conf:



destination php { file("/var/log/php.log" owner(root) group(devel) perm(0620)); };

log { source(src); filter(f_php); destination(php); };

adam _at_ lockdownnetworks _dot_ com
11-Apr-2007 04:32


Be aware when using syslog() that if you set the timezone of environment to be something other than the standard, syslog() may log the time to the log(s) with the wrong time zone information. For example:



<?php



openlog('mylog', LOG_PID | LOG_ODELAY,LOG_LOCAL4);



putenv('TZ=UTC');

syslog(LOG_INFO, 'UTC Log line');



putenv('TZ=US/Pacific');

syslog(LOG_INFO, 'US/Pacific Log line');



closelog();



?>



Viewing the /usr/log/messages log will display these two lines:



Apr 11 01:25:39 hostname mylog[1400]: UTC Log line

Apr 10 18:25:39 hostname mylog[1400]: US/Pacific Log line



Adam.

Torsten
23-Apr-2004 04:27


I had a problem trying to issue a syslog message with IIS 5.1 under Windows XP. The function call seemed to succeed, but the event viewer showed that no entry was made.

Finally I found out that the user account used for the webserver (IUSR_<Computername>) did not have enough permissions to issue syslog alerts. I changed this by adding this user to the Users group instead of only Guest.

daniele dot patoner at biblio dot unitn dot it
06-Nov-2003 09:00


This work for me, to redirect  logs to a separate syslog file



put this line in your /etc/syslog.conf :



local0.debug   /var/log/php.log



Then restart syslogd:



/etc/init.d/syslog restart



php example:



<?php

define_syslog_variables();

openlog("TextLog", LOG_PID, LOG_LOCAL0);



$data = date("Y/m/d H:i:s");

syslog(LOG_DEBUG,"Messagge: $data");



closelog();

?>

gregj at pdxperts dot com
29-Jul-2003 03:05


The message string sent to the log file is limited to 500 characters.

monte at ispi dot net
03-Jul-2003 09:05


If you have php.ini setup to send PHP errors to syslog, they will all get dumped into /var/log/messages (at least it does with RedHat 9 by default). I wanted to figure out how to get PHP errors to go to their own syslog file.



After some trial and error, I figured out what facility and priority PHP uses, which is "user.notice". So, to get your PHP errors going to a separate syslog file, put this line in your /etc/syslog.conf :



user.notice   /var/log/php.log



Then restart syslogd:



/etc/init.d/syslog restart



Why PHP uses "user" as the facility I'm not sure, probably because it's the only one that works under Windows?



Monte

nospam \100 jraxis com (that's right!)
31-Mar-2002 07:32


This *does* actually goto the system log as configured in /etc/syslog.conf (such as /var/log/messages), it doesn't goto Apache's ErrorLog (such as /var/log/httpd/error_log). At least under my Debian Potato with Apache 1.3.23.



Use error_log() to be sure it gets into Apache's ErrorLog.

dpreece at paradise dot net dot nz
30-Jan-2002 02:08


To set up a custom log file via the syslog daemon (FreeBSD in this case)...



Add to /etc/syslog.conf a line that says all errors from the httpd process are to go to a file called (for example) /var/log/httpd-php.log



!httpd

*.*   {tab}   /var/log/httpd-php.log



Note the tab, being a tab character! Next create a blank file to be written to. I'm sure there are 1e+6 ways to do this, but I choose



# cat > httpd-php.log << EOF

? EOF



Finally find your syslog daemon and send it a sighup to inform it of the change:



# ps ax | grep syslogd

  133  ??  Ss     0:07.23 syslogd -s

# kill -1 133



Et voila! Php syslog calls will now arrive in /var/log/httpd-php.log

mavetju at chello dot nl
22-Jan-2001 04:11


With FreeBSD I can use: syslog(LOG_INFO,"test");





BSD/OS does not support this, I had to use the literal values for the priority (158: local3.info):


syslog(158,"test");

gherson at snet dot net
20-Dec-2000 11:09


Example of where to look for syslog's output:   /var/log/httpd/access_log


(on Red Hat Linux Secure Server v6.2).

rcgraves+php at brandeis dot edu
17-Feb-2000 10:51


For the-header-file-enabled:





man 3 syslog defines the priorities, but not the integer values. For that you'll need to read your system header file.





Let's suppose I want to log an informational message in the mail log (which happens to be true). The man page tells me I want LOG_MAIL|LOG_INFO. So I look in /usr/include/sys/syslog.h and find (this happens to be Linux, your system could be different):





#define LOG_INFO        6       /* informational */


#define LOG_MAIL        (2<<3)  /* mail system */





2<<3 means shift 3 bits left, which means multiply by 8. So I want 2*8 + 6 = 22. syslog(22,"this message will appear in the mail log"); And indeed it does.

bb at lb-data dot co dot at
08-Sep-1999 01:54


In Windows NT, use the following values of priority:


1 = error,


6 = info

add a note

SAM

Network Funzioni

Last updated: Fri, 18 Jul 2008