note 100183 added to function.usort

This comment is just to help backward compatibility. I needed to have a foreach loop using reference just before using the usort function on the same array that was used in the foreach. Like this: <?php public function sortByTitle() { if(empty($this->_arrSubCat)) return false; foreach($this->_arrSubCat as &$cat) $cat->sortByTitle(); usort($this->_arrSubCat, 'strcasecmp'); } ?> I had this strange bug where the last object of the $this->_arrSubCat array before the sort was alway replaced/overwrited with his string value. On my machine (PHP 5.3), I had no problem, but when I placed the code on another server, my code crashed with a fatal error (Because I was using a string as an object later in the code) The solution I found is really simple, and avoid the array to have a reference declared in memory while running the sort function. Just add an unset($cat): <?php public function sortByTitle() { if(empty($this->_arrSubCat)) return false; foreach($this->_arrSubCat as &$cat) $cat->sortByTitle(); unset($cat); //No more problem because of the foreach &cat reference. usort($this->_arrSubCat, 'strcasecmp'); } ?> It took me an hour an a half to locate the bug, hope it will save someone some time ! ---- Server IP: 72.55.140.6 Probable Submitter: 24.37.122.45 ---- Manual Page -- http://www.php.net/manual/en/function.usort.php Edit -- https://master.php.net/note/edit/100183 Del: integrated -- https://master.php.net/note/delete/100183/integrated Del: useless -- https://master.php.net/note/delete/100183/useless Del: bad code -- https://master.php.net/note/delete/100183/bad+code Del: spam -- https://master.php.net/note/delete/100183/spam Del: non-english -- https://master.php.net/note/delete/100183/non-english Del: in docs -- https://master.php.net/note/delete/100183/in+docs Del: other reasons-- https://master.php.net/note/delete/100183 Reject -- https://master.php.net/note/reject/100183 Search -- https://master.php.net/manage/user-notes.php