(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
msg_receive — Receive a message from a message queue
msg_receive() will receive the first message from the
queue of the type specified by
The message queue.
desired_message_type is 0, the message from the front
of the queue is returned. If
greater than 0, then the first message of that type is returned.
desired_message_type is less than 0, the first
message on the queue with a type less than or equal to the
absolute value of
desired_message_type will be read.
If no messages match the criteria, your script will wait until a suitable
message arrives on the queue. You can prevent the script from blocking
MSG_IPC_NOWAIT in the
The type of the message that was received will be stored in this parameter.
The maximum size of message to be accepted is specified by the
max_message_size; if the message in the queue is larger
than this size the function will fail (unless you set
flags as described below).
The received message will be stored in
unless there were errors receiving the message.
If set to
true, the message is treated as though it was serialized using the
same mechanism as the session module. The message will be unserialized
and then returned to your script. This allows you to easily receive
arrays or complex object structures from other PHP scripts, or if you
are using the WDDX serializer, from any WDDX compatible source.
false, the message will be
returned as a binary-safe string.
flags allows you to pass flags to the
low-level msgrcv system call. It defaults to 0, but you may specify one
or more of the following values (by adding or ORing them together).
||If there are no messages of the
||Using this flag in combination with a
If the message is longer than
If the function fails, the optional
will be set to the value of the system errno variable.
Upon successful completion the message queue data structure is updated as
msg_lrpid is set to the process-ID of the
msg_qnum is decremented by 1 and
msg_rtime is set to the current time.