msg_send() sends a message of type msgtype (which MUST be greater than 0) to the message queue specified by queue.
The optional serialize controls how the
message is sent. serialize
TRUE which means that the message is
serialized using the same mechanism as the session module before being
sent to the queue. This allows complex arrays and objects to be sent to
other PHP scripts, or if you are using the WDDX serializer, to any WDDX
If the message is too large to fit in the queue, your script will wait
until another process reads messages from the queue and frees enough
space for your message to be sent.
This is called blocking; you can prevent blocking by setting the
optional blocking parameter to
FALSE, in which
case msg_send() will immediately return
FALSE if the
message is too big for the queue, and set the optional
indicating that you should try to send your message again a little
TRUE on success or
FALSE on failure.
Upon successful completion the message queue data structure is updated as follows: msg_lspid is set to the process-ID of the calling process, msg_qnum is incremented by 1 and msg_stime is set to the current time.