posix_setsid

(PHP 4, PHP 5, PHP 7)

posix_setsid — Make the current process a session leader

说明

posix_setsid ( void ) : int

Make the current process a session leader.

返回值

Returns the session id, or -1 on errors.

参见

  • The POSIX.1 and the setsid(2) manual page on the POSIX system for more information on process groups and job control.

User Contributed Notes

karlsson dot nicklas at gmail dot com 22-Jan-2008 08:32
Very useful when making daemons, for example:

<?php
    $pid = pcntl_fork(); // fork
    if ($pid < 0)
        exit;
    else if ($pid) // parent
        exit;
    else { // child
   
        $sid = posix_setsid();
       
        if ($sid < 0)
            exit;
           
        for($i = 0; $i <= 60; $i++) { // do something for 5 minutes
            sleep(5);
        }
    }
?>