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    <p>This is intended. It returns an id that you can use in PHP to access the shared memory block. It is a shmop resource as you can see here: <a href="http://php.net/manual/en/resource.php" rel="nofollow">http://php.net/manual/en/resource.php</a></p> <p>To figure out which one it is, use your own key instead of 0. I wrote up a quick example:</p> <pre><code>&lt;?php echo "Opening shared memory!\n"; if($shm_id = shmop_open(0xdeadbeef, 'c', 0666, 1024)) { echo "Opened shared memory\n"; echo "Wrote " . shmop_write($shm_id, "Testing", 0) . " bytes.\n"; echo shmop_read($shm_id, 0, 7) . "\n"; var_dump($shm_id); echo $shm_id . "\n"; $line = `ipcs -m |grep deadbeef`; list($null, $shmid, $null) = explode(' ', $line); echo "shmid is: " . $shmid . "\n"; } ?&gt; </code></pre> <p>Output:</p> <blockquote> <p>Opening shared memory! Opened shared memory Wrote 7 bytes. Testing int(4) 4 shmid is: 1533149226</p> </blockquote> <p>And as you can see, it is easy to find:</p> <blockquote> <pre><code>[nedwidek@yule ~]$ ipcs -m |grep deadbeef 0xdeadbeef 1533149226 nedwidek 666 1024 0 </code></pre> </blockquote> <p>Just an update on what I've pursued:</p> <p>From php-src/ext/shmop/shmop.c (<a href="https://github.com/php/php-src/blob/master/ext/shmop/shmop.c" rel="nofollow">https://github.com/php/php-src/blob/master/ext/shmop/shmop.c</a>)</p> <pre><code>rsid = zend_list_insert(shmop, shm_type TSRMLS_CC); RETURN_LONG(rsid); </code></pre> <p>Two things here.... Validates that you get a resource id back and the shmop struct is persisted. This means that shmod->shmid can be obtained.</p> <p>I've also subscribed to the internals mailing list. I'll be posting a query on why they don't allow you to get the shmid, if a function were introduced to get it (or maybe the shmop details as a hash array) would they merge a patch for this.</p> <p>Let me know what your interest level is in any of this (collaborate on a patch, receive any patch I come up with, wait for PHP to officially integrate (if ever), or none). If you're not interested at all, I'll stop updating my answer. -- Regards Erik.</p>
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    1. COI added one way to get the shmid in PHP. I don't believe there is a way to get it with a pure PHP implementation (other than creating an extension). I'd love to be proved wrong.
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    2. CO+1 for the good answer. Unfortunately, I need to use 0 though. I'm recreating a legacy C program, and it uses `IPC_PRIVATE` as the key.
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    3. COAh, ok. I'm actually rather curious on why the PHP devs never saw it fit to expose the shmid into PHP. I get the whole resource abstraction that they are doing, but to not give you a way to see the underlying OS resource identifiers..... Might be a good question for the dev list.
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