The behaviour of these functions is affected by settings in php.ini.
Network Configuration Options
||Deprecated in PHP 5.3.0. Removed in PHP 5.4.0.
For further details and definitions of the
PHP_INI_* modes, see the Where a configuration setting may be set
Here's a short explanation of
the configuration directives.
Whether or not to define the various syslog variables (e.g. $LOG_PID,
$LOG_CRON, etc.). Turning it off is a good idea performance-wise. At
runtime, you can define these variables by calling