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 (default: 0666). 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. If the message queue already
exists, the perms will be
ignored.
See also: msg_remove_queue(),
msg_receive(), msg_send(),
msg_stat_queue() and
msg_set_queue().
This function was introduced in PHP 4.3.0 (not yet
released).