msg_remove_queue
When sending non-complex (serialize = false) messages to a program in C, you need to add the null character to the string (\0). Otherwise the previous message will be partially visible if it is longer than the current message. Took some kind help from comp.lang.php for me to figure that out. While it seems so obvious now, I thought I'd share it here.
msg_send
(PHP 4 >= 4.3.0, PHP 5)
msg_send — Send a message to a message queue
Description
bool msg_send
( resource
$queue
, int $msgtype
, mixed $message
[, bool $serialize = true
[, bool $blocking = true
[, int &$errorcode
]]] )
msg_send() sends a message of type
msgtype (which MUST be greater than 0) to
the message queue specified by queue.
Parameters
-
queue -
-
msgtype -
-
message -
-
serialize -
The optional
serializecontrols how themessageis sent.serializedefaults toTRUEwhich means that themessageis 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 compatible client. -
blocking -
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
blockingparameter toFALSE, in which case msg_send() will immediately returnFALSEif the message is too big for the queue, and set the optionalerrorcodetoMSG_EAGAIN, indicating that you should try to send your message again a little later on. -
errorcode -
Return Values
Returns 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.
See Also
- msg_remove_queue() - Destroy a message queue
- msg_receive() - Receive a message from a message queue
- msg_stat_queue() - Returns information from the message queue data structure
- msg_set_queue() - Set information in the message queue data structure
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User Contributed Notes
msg_send - [5 notes]
Muffinman ¶
7 months ago
michael dot NO dot SP dot AM dot cordover+php at gmail dot com ¶
3 years ago
After about an hour of debugging I've discovered the meaning of the undocumented "PHP Warning: msg_send(): msgsnd failed: Invalid argument" ($errorcode = 13).
This occurred when the size of $message was larger than msg_qbytes (see msg_stat_queue() for how to determine and change msg_qbytes).
shepik at yandex dot ru ¶
4 years ago
$msgtype used in msg_send function can be any positive integer.
bryan-boone at msn dot com ¶
5 years ago
I think it is kinda lame why I cannot find out (easily) explicitly which types of messages are allowed and which ones are not. Maybe we can start our own little list. I know that strings work, and arrays do not.
webmaster at toolshed51 dot com ¶
10 years ago
Sample sending webpage, see msg_receive for matching service
<?php
$MSGKEY = 519051;
$msg_id = msg_get_queue ($MSGKEY, 0600);
if (!msg_send ($msg_id, 1, 'Hi', true, true, $msg_err))
echo "Msg not sent because $msg_err\n";
?>