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syslog
Generate a system log message
(PHP 4, PHP 5)
bool syslog ( int priority, string message )
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:
Table 207. syslog() Priorities (in descending order)
Constant Description LOG_EMERGsystem is unusable LOG_ALERTaction must be taken immediately LOG_CRITcritical conditions LOG_ERRerror conditions LOG_WARNINGwarning conditions LOG_NOTICEnormal, but significant, condition LOG_INFOinformational message LOG_DEBUGdebug-level message
- message
The message to send, except that the two characters
%mwill be replaced by the error message string (strerror) corresponding to the present value of errno.
Examples
Example 1612. Using syslog()
<?php
define_syslog_variables();
// open syslog, include the process ID and also send
// the log to standard error, and use a user defined
// logging mechanism
openlog("myScriptLog", LOG_PID | LOG_PERROR, LOG_LOCAL0);
// some code
if (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.
Use of LOG_LOCAL0 through
LOG_LOCAL7 for the facility
parameter of openlog() is not available
in Windows.