note 126981 added to function.usort

I'm reporting a strange behavior of usort while trying to sort array (with number index in string format) by subarray item value (see example): $example = array( "1" => array("tit" => "title 1", "val" => 2), "2" => array("tit" => "title 2", "val" => 10), "3" => array("tit" => "title 3", "val" => 5) ); usort( $example, function ($a, $b) { if ( $a["val"] == $b["val"] ) { return 0; } if ( $a["val"] < $b["val"] ) { return 1; }else{ return -1; } } In this case usort will mess up all the values of "val" items (!), and in some cases it creates a new item (with just the "val" field in the new subarray). ---- Server IP: 45.112.84.4 Probable Submitter: 80.90.5.135 (proxied: 185.5.245.234) ---- Manual Page -- https://php.net/manual/en/function.usort.php Edit -- https://main.php.net/note/edit/126981 Del: integrated -- https://main.php.net/note/delete/126981/integrated Del: useless -- https://main.php.net/note/delete/126981/useless Del: bad code -- https://main.php.net/note/delete/126981/bad+code Del: spam -- https://main.php.net/note/delete/126981/spam Del: non-english -- https://main.php.net/note/delete/126981/non-english Del: in docs -- https://main.php.net/note/delete/126981/in+docs Del: other reasons-- https://main.php.net/note/delete/126981 Reject -- https://main.php.net/note/reject/126981 Search -- https://main.php.net/manage/user-notes.php