note 55432 added to function.in-array

Beware of type conversion! This snippet will unset every 0 key element form the array, when cycling an array which contains at least one _num value. This is because php tries to convert every element of $forbidden_elements to integer when encountering a numeric index into array. So $array[0] it's considered equal to (int)'_num'. <?php $forbidden_elements=array('_num'); foreach ($array as $key=>$value){ if (in_array($key,$forbidden_elements)){ unset ($array[$key]); } } ?> The following example works, anway you can use strict comparison as well. <?php $forbidden_elements=array('_num'); foreach ($array as $key=>$value){ if (in_array($key,$forbidden_elements) && is_string($key)){ unset ($array[$key]); } } ?> ---- Manual Page -- http://www.php.net/manual/en/function.in-array.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+55432 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+55432&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+55432&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+55432&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+55432&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+55432&report=yes&reason=non-english Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+55432&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+55432&report=yes Search -- http://master.php.net/manage/user-notes.php