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.
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 priority parameter have the following meanings:
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
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.
proc_nice will only exist if your system has 'nice' capabilities. 'nice' conforms to: SVr4, SVID EXT, AT&T, X/OPEN, BSD 4.3.
proc_nice will change the current process priority, even if PHP was compiled using thread safety.
|7.2.0||This function is now available on Windows.|