posix_setsid()

(PHP 4, PHP 5, PHP 7)

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.

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);
    }
  }
?>