   #PHP Manual POSIX functions posix_getlogin posix_getpgrp

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                                 posix_getpgid

   (PHP 3>= 3.0.10, PHP 4 )
   posix_getpgid -- Get process group id for job control

Description

   int posix_getpgid ( int pid)

   Returns the process group identifier of the process pid.

   This is not a POSIX function, but is common on BSD and System V
   systems. If your system does not support this function at system
   level, this PHP function will always return FALSE.
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