(PHP 4 >= 4.3.0, PHP 5)
msg_get_queue — Create or attach to a message queue
$key
   [, int $perms = 0666
  ] )
   msg_get_queue() returns an id that can be used to
   access the System V message queue with the given
   key. The first call creates the message queue with
   the optional perms.
   A second call to msg_get_queue() for the same
   key will return a different message queue
   identifier, but both identifiers access the same underlying message
   queue.
  
keyMessage queue numeric ID
perms
       Queue permissions. Default to 0666. If the message queue already
       exists, the perms will be ignored.
      
Returns a resource handle that can be used to access the System V message queue.