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    <p><a href="http://php.net/manual/en/language.pseudo-types.php" rel="nofollow noreferrer">Callbacks</a>, like the one used by usort, can be specified in 3 different ways:</p> <ul> <li><p>a string containing the name of the function: </p> <pre><code>usort($mylist, 'compare_foos'); </code></pre></li> <li><p>an actual function:</p> <pre><code>usort($mylist, create_function(/*...*/)); // php &gt;= 5.3 only: usort($mylist, function ($a, $b) { /* ... */ }); </code></pre></li> <li><p>an array to access object methods:</p> <pre><code>usort($mylist, array($myobject, 'mymethod')); </code></pre></li> </ul> <p>Using a callback the way you did is not valid and php returns an error:</p> <pre><code>PHP Notice: Use of undefined constant compare_foos - assumed 'compare_foos' in /home/lepidosteus/test.php on line 28 </code></pre> <p>To see it, remember to code with every error enabled on your development machine (but hide them on the production server), using <a href="http://php.net/manual/en/function.error-reporting.php" rel="nofollow noreferrer">error_reporting()</a>:</p> <pre><code>error_reporting(E_ALL); // display all errors including notices error_reporting(0); // hide all errors </code></pre> <p>By the way if you want to use an object as a simple store, you don't need to create a dedicated class you can use <a href="https://stackoverflow.com/questions/931407/what-is-stdclass-in-php">stdClass()</a>:</p> <pre><code>$mylist[$i] = new stdClass(); $mylist[$i]-&gt;idx = $i; $mylist[$i]-&gt;data = rand() % 20; </code></pre> <p>Also, you can use <a href="http://fr2.php.net/var_dump" rel="nofollow noreferrer">var_dump()</a> instead of print_r when you debug to get detailed information about the type of each variable, can help you quickly find out if something is wrong.</p>
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    1. COThanks, this is helpful and teaches me things I did not know. I can see from var_dump() that usort is somehow replacing an element of the array with an uninitialised one. [10]=> object(foo)#10 (2) { ["idx"]=> NULL ["data"]=> NULL }. I'll put it down to a php bug, or a bug in my php system, and work around it. Maybe getting off topic here now, but is there a test suite to verify the functionality of a php system?
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    2. COIf I copy the code from your question inside a file (fixing the callback issue and adding php opening tag) and execute it a dozen times, I can't ever reproduce this behavior. Have you tried that yourself ? (ONLY the code in the question, not a single line more, even if you think it won't affect it). It feels like your issue comes from elsewhere.
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    3. COYea the code should work. This is why I thought to seek the advice of PHP specialists. It's fine on a different PHP server. Just some local weirdness with the install I guess. Again thanks for your assistance in explaining various PHP things.
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