syslog

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

syslog — Generate a system log message

Description

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

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

One of the LOG_EMERG, LOG_ALERT, LOG_CRIT, LOG_ERR, LOG_WARNING, LOG_NOTICE, LOG_INFO, LOG_DEBUG constants.

message

The message to send.

Return Values

Always returns true.

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 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, the syslog service is emulated using the Event Log.

Note:

Use of LOG_LOCAL0 through LOG_LOCAL7 for the facility parameter of openlog() is not available in Windows.

See Also