proc_nice
(PHP 5, PHP 7)
proc_nice — Change the priority of the current process
Description
bool proc_nice ( int $increment ) proc_nice() changes the priority of the current process by the amount specified in increment. A positive increment will lower the priority of the current process, whereas a negative increment will raise the priority.
proc_nice() is not related to proc_open() and its associated functions in any way.
Parameters
increment
The new priority value, the value of this may differ on platforms.
on Unix, a low value, such as -20 means high priority wheras a positive value have a lower priority.
For Windows the increment parameter have the following meanings:
Priority class | Possible values |
|---|---|
High priority | increment < -9 |
Above normal priority | increment < -4 |
Normal priority | increment < 5 & increment > -5 |
Below normal priority | increment > 5 |
Idle priority | increment > 9 |
Return Values
Returns TRUE on success or FALSE on failure. If an error occurs, like the user lacks permission to change the priority, an error of level E_WARNING is also generated.
Examples
Example #1 Using proc_nice() to set the process priority to high
<?php
// Highest priority
proc_nice(-20);
?>Changelog
Version | Description |
|---|---|
7.2.0 | This function is now available on Windows. |
Notes
Note: Availability proc_nice() will only exist if your system has 'nice' capabilities. 'nice' conforms to: SVr4, SVID EXT, AT&T, X/OPEN, BSD 4.3.
Note: Windows only proc_nice() will change the current process priority, even if PHP was compiled using thread safety.
← proc_get_status
proc_open →
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