proc_nice

Description

proc_nice() changes the priority of the current process by the amount specified in priority. A positive priority will lower the priority of the current process, whereas a negative priority will raise the priority.

proc_nice() is not related to proc_open() and its associated functions in any way.

Parameters

priority

The new priority value, the value of this may differ on platforms.

On Unix, a low value, such as -20 means high priority whereas positive values have a lower priority.

For Windows the priority parameter has the following meaning:

Priority class	Possible values
High priority	priority< -9
Above normal priority	priority< -4
Normal priority	priority< 5 & priority > -5
Below normal priority	priority> 5
Idle priority	priority> 9

Return Values

Success If an error occurs, like the user lacks permission to change the priority, an error of level E_WARNING is also generated.

Changelog

Examples

Using proc_nice() to set the process priority to high

<?php
// Highest priority
proc_nice(-20);
?>

Notes

See Also

• pcntl_setpriority()