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syslog

(PHP 4, PHP 5, PHP 7, PHP 8)

syslogGénère un message dans l'historique système

Description

syslog(int $priority, string $message): true

syslog() génère un message qui sera inscrit dans l'historique par le système.

Pour plus d'informations sur comment mettre en place un gestionnaire d'historique, reportez-vous au manuel Unix, page 5 syslog.conf (5). D'autres informations sur les systèmes d'historique et leurs options sont aussi disponibles dans le manuel syslog (3) des machines Unix.

Liste de paramètres

priority

priority est une combinaison des valeurs d'accès et de niveau. Les valeurs possibles sont :

Priorités syslog() (en ordre décroissant)
Constante Description
LOG_EMERG système inutilisable
LOG_ALERT une décision doit être prise immédiatement
LOG_CRIT condition critique
LOG_ERR condition d'erreur
LOG_WARNING condition d'alerte
LOG_NOTICE condition normale, mais significative
LOG_INFO message d'information
LOG_DEBUG message de déboguage

message

Le message à envoyer.

Valeurs de retour

Retourne toujours true.

Exemples

Exemple #1 Exemple avec syslog()

<?php
// ouverture de syslog, ajout du PID et envoi simultané du
// message à la sortie standard et à un mécanisme
// spécifique
openlog("myScriptLog", LOG_PID | LOG_PERROR, LOG_LOCAL0);

// quelques lignes de code

if (authorized_client()) {
// faire quelquechose
} else {
// client non autorisé!
// notation de la tentative
$access = date("Y/m/d H:i:s");
syslog(LOG_WARNING, "Unauthorized client: $access {$_SERVER['REMOTE_ADDR']} ({$_SERVER['HTTP_USER_AGENT']})");
}

closelog();
?>

Notes

Sur Windows, l'historique est pris en charge par le log d'événements.

Note:

L'utilisation de LOG_LOCAL0 à LOG_LOCAL7 pour le paramètre facility de la fonction openlog() n'est pas disponible sous Windows.

Voir aussi

  • openlog() - Ouvre la connexion à l'historique système
  • closelog() - Ferme la connexion à l'historique système
  • Paramètre INI syslog.filter (à partir de PHP 7.3)

add a note

User Contributed Notes 18 notes

up
11
james dot ellis at gmail dot com
16 years ago
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"
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6
stevekamerman at gmail dot com
5 years ago
This function sends messages in BSD Syslog RFC 3164 format (https://tools.ietf.org/html/rfc3164).

To see the raw messages being sent by PHP to the logging socket, first stop your syslog/rsylsog/ng-syslog service, then listen to the logging socket with the netcat-openbsd package:

nc -U -l /dev/log

Now, log something from PHP:

<?php
syslog
(LOG_LOCAL1|LOG_INFO, "Test from PHP");
?>

You will see the rfc3164 output from netcat:

<142>Oct 24 14:32:51 php: Test from PHP
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4
OWM
3 years ago
Syslog autodetects newline control characters and therefore splits the message by multiple lines. To prevent this behavior in PHP 7.3+ you can use undocumented (at this moment) ini setting:

<?php

ini_set
('syslog.filter', 'raw');

# more info here: https://bugs.php.net/bug.php?id=77913
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8
Antonio Lobato
13 years ago
A word of warning; if you use openlog() to ready syslog() and your Apache threads accept multiple requests, you *must* call closelog() if Apache's error log is configured to write to syslog. Failure to do so will cause Apache's error log to write to whatever facility/ident was used in openlog.

Example, in httpd.conf you have:

ErrorLog syslog:local7

and in php you do:

<?php
openlog
("myprogram", 0, LOG_LOCAL0);
syslog("My syslog message");
?>

From here on out, this Apache thread will write ErrorLog to local0 and under the process name "myprogram" and not httpd! Calling closelog() will fix this.
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4
rgagnon24 at gmail dot com
5 years ago
This one had me going for a while when using LOG_ constants in another object, when developing on Windows, but deploying on Linux.

Windows evaluates some of the LOG_ constants to the same value, while LINUX does not.

The 8 constants and their differences on the platforms to be aware of:

Linux has these values as:
========================
LOG_EMERG = 0
LOG_ALERT = 1
LOG_CRIT = 2
LOG_ERR = 3
LOG_WARNING = 4
LOG_NOTICE = 5
LOG_INFO = 6
LOG_DEBUG = 7

While on Windows, you have:
==========================
LOG_EMERG = 1
LOG_ALERT = 1
LOG_CRIT = 1
LOG_ERR = 4
LOG_WARNING = 5
LOG_NOTICE = 6
LOG_INFO = 6
LOG_DEBUG = 6

So if you're setting LOG_WARNING in your code, Linux will use 4 as the priority while Windows will use 5.

This is not a bug in PHP on either platform, but a difference in the system header files that PHP compiles with. Not really anything you can do, but be aware if you're wondering why your messages log at different priorities depending on the platform, this could be why.
up
1
Anonymous
2 years ago
There's no point to manually timestamp the message (as shown in docs' example) as all sane logging systems timestamp all entries by themselves.
up
2
huangyg11 at gmail dot com
8 years ago
For those who want to simultaneously write to multiple syslog facilities :

syslog(LOG_INFO|LOG_LOCAL0, "message for local0");
syslog(LOG_INFO|LOG_LOCAL1, "message for local1");
up
1
helly at php dot net
16 years ago
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); };
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0
daniele dot patoner at biblio dot unitn dot it
20 years ago
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();
?>
up
0
mavetju at chello dot nl
23 years ago
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");
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-1
antoine dot leverve dot EXT at zodiacaerospace dot com
8 years ago
The documentation is incorrect when it says "Priorities (in descending order)", as the table that follows is actually in **ascending** order.

For example my output says:
LOG_ERR : 4
LOG_WARNING : 5
LOG_DEBUG : 6

An important difference, that caused me some pain!
up
-1
gregj at pdxperts dot com
20 years ago
The message string sent to the log file is limited to 500 characters.
up
-2
dpreece at paradise dot net dot nz
22 years ago
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
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-2
bb at lb-data dot co dot at
24 years ago
In Windows NT, use the following values of priority:
1 = error,
6 = info
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-5
Torsten
19 years ago
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.
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-4
rcgraves+php at brandeis dot edu
24 years ago
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.
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-11
adam _at_ lockdownnetworks _dot_ com
16 years ago
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.
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-14
gherson at snet dot net
23 years ago
Example of where to look for syslog's output: /var/log/httpd/access_log
(on Red Hat Linux Secure Server v6.2).
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