msg_receive() will receive the first message from the specified queue of the type specified by desiredmsgtype.
If desiredmsgtype is 0, the message from the front
of the queue is returned. If desiredmsgtype is
greater than 0, then the first message of that type is returned.
If desiredmsgtype is less than 0, the first
message on the queue with the lowest type less than or equal to the
absolute value of desiredmsgtype 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 maxsize; 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 message, unless there were errors receiving the message.
unserialize defaults to
TRUE; if it is 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.
If unserialize is
FALSE, the message will be
returned as a binary-safe string.
The optional 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
desiredmsgtype, return immediately and do not
wait. The function will fail and return an integer value
corresponding to |
|Using this flag in combination with a desiredmsgtype greater than 0 will cause the function to receive the first message that is not equal to desiredmsgtype.|
|If the message is longer than maxsize, setting this flag will truncate the message to maxsize and will not signal an error.|
If the function fails, the optional errorcode will be set to the value of the system errno variable.
TRUE on success or
FALSE on failure.
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.