Php/docs/function.syslog
syslog
(PHP 4, PHP 5, PHP 7)
syslog — Generate a system log message
Description
syslog
( int $priority
, string $message
) : bool
syslog() generates a log message that will be distributed by the system logger.
For information on setting up a user defined log handler, see the syslog.conf (5) Unix manual page. More information on the syslog facilities and option can be found in the man pages for syslog (3) on Unix machines.
Parameters
priority
priority
is a combination of the facility and the level. Possible values are:syslog() Priorities (in descending order) Constant Description LOG_EMERG
system is unusable LOG_ALERT
action must be taken immediately LOG_CRIT
critical conditions LOG_ERR
error conditions LOG_WARNING
warning conditions LOG_NOTICE
normal, but significant, condition LOG_INFO
informational message LOG_DEBUG
debug-level message message
The message to send, except that the two characters
%m
will be replaced by the error message string (strerror) corresponding to the present value of errno.
Return Values
Returns TRUE
on success or FALSE
on failure.
Examples
Example #1 Using syslog()
<?php// open syslog, include the process ID and also send// the log to standard error, and use a user defined// logging mechanismopenlog("myScriptLog", LOG_PID | LOG_PERROR, LOG_LOCAL0);// some codeif (authorized_client()) { // do something} else { // unauthorized client! // log the attempt $access = date("Y/m/d H:i:s"); syslog(LOG_WARNING, "Unauthorized client: $access {$_SERVER['REMOTE_ADDR']} ({$_SERVER['HTTP_USER_AGENT']})");}closelog();?>
Notes
On Windows NT, the syslog service is emulated using the Event Log.
Note:
Use of
LOG_LOCAL0
throughLOG_LOCAL7
for thefacility
parameter of openlog() is not available in Windows.
See Also
- openlog() - Open connection to system logger
- closelog() - Close connection to system logger