(PHP 5 >= 5.3.0, PHP 7)
msg_queue_exists — Check whether a message queue exists
$key
) : bool
Checks whether the message queue key exists.
keyQueue key.
成功时返回 TRUE， 或者在失败时返回 FALSE。
This function is creating new queue (and returning true) if you set NULL into $key variable.
<?php
$isQueueCreated = msg_queue_exists(NULL);
print $isQueueCreated ? "WTF??!" : "ok, everything is fine..";
?>
WTF??!
# ipcs -q
0x00000000 173047808 root 0 0 0
Following code will do the job:
<?php
$key = 0;
while (true) {
echo $key,"...\r";
if (msg_queue_exists($key))
echo "\r",$key,'::Exists',"\n";
$key++;
}
?>
A simple script for checking what message queues are in use on a [presumably new] server environment.
Run with php-cli
<?php
$k = 0;
while (true) {
echo $key,"...\r";
if (msg_queue_exists($key))
echo "\r",$key,'::Exists',"\n";
$key++;
}
?>
A workaround for those not yet running 5.3 on *nix:
<?php
function queue_exists($key) {
if(function_exists("msg_queue_exists")) {
return msg_queue_exists($key);
} else {
$aQueues = array();
exec("ipcs -q | grep \"^[0-9]\" | cut -d \" \" -f 1", $aQueues);
if(in_array($key,$aQueues)) return true;
else return false;
}
}
?>
Maybe a bit slow and kludgey, but it works.