PHP: openlog - Manual

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

openlog — Open connection to system logger

Description

function openlog(string $prefix, int $flags, int $facility): true

The use of openlog() is optional. It will automatically be called by syslog() if necessary, in which case prefix will default to the empty string.

Return Values

Always returns true.

Changelog

See Also

• syslog() - Generate a system log message
• closelog() - Close connection to system logger

To those curious; switching between different facilities is NOT an issue. There is no apparent memory overhead (nor slowdown) by calling openlog multiple(12 * 10000) times.

Shown by this example:

<?php
$facilities = array(
    LOG_AUTH,
    LOG_AUTHPRIV,
    LOG_CRON,
    LOG_DAEMON,
    LOG_KERN,
    LOG_LOCAL0,
    LOG_LPR,
    LOG_MAIL,
    LOG_NEWS,
    LOG_SYSLOG,
    LOG_USER,
    LOG_UUCP,
);

for ($i = 0; $i < 10000; $i++) {
    foreach ($facilities as $facility) {
        openlog('test', LOG_PID, $facility);
        syslog(LOG_ERR, "This is a test: " . memory_get_usage(true));
    }
}
?>