note 57368 added to ref.image

I was looking for a function to determine whether a variable is a valid image ressource. After a bit of thinking I came up with this pretty fast solution: <?php function is_gd_handle($var) { ob_start(); imagecolorallocate($var, 255, 255, 255); $error = ob_get_contents(); ob_end_clean(); if(preg_match('/not a valid Image resource/',$error)) { return false; } else { return true; } } ?> Hope it saved somebody some time! ---- Manual Page -- http://www.php.net/manual/en/ref.image.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+57368 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+57368&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+57368&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+57368&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+57368&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+57368&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+57368&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+57368&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+57368&report=yes Search -- http://master.php.net/manage/user-notes.php