PHP sys_getloadavg() Function

The PHP sys_getloadavg() function is used to get system load average. It returns three samples representing the average system load (the number of processes in the system run queue) over the last 1, 5 and 15 minutes, respectively. It returns false on failure.

Syntax

sys_getloadavg()

Parameters

No parameter is required.

Return Value

Returns an array with three samples (last 1, 5 and 15 minutes).

Example: sys_getloadavg() example

The example below shows the usage of sys_getloadavg() function.

<?php
$load = sys_getloadavg();

//displaying the system load average
print_r($load);

//taking action when the load average in 
//last 1 minute is greater than 0.8
if ($load[0] > 0.80) {
  header('HTTP/1.1 503 Too busy, try again later');
  die('Server too busy. Please try again later.');
}
?>

The output of the above code will be similar to:

Array
(
    [0] => 0.01
    [1] => 0.04
    [2] => 0.01
)