note 73505 added to function.is-array

The is_associative_array() and is_sequential_array() functions posted by 'rjg4013 at rit dot edu' are not accurate. The functions fail to recognize indexes that are not in sequence or in order. For example, array(0=>'a', 2=>'b', 1=>'c') and array(0=>'a', 3=>'b', 5=>'c') would be considered as sequential arrays. A true sequential array would be in consecutive order with no gaps in the indices. The following solution utilizes the array_merge properties. If only one array is given and the array is numerically indexed, the keys get re-indexed in a continuous way. The result must match the array passed to it in order to truly be a numerically indexed (sequential) array. Otherwise it can be assumed to be an associative array (something unobtainable in languages such as C). The following functions will work for PHP >= 4. <?php function is_sequential_array($var) { return (array_merge($var) === $var && is_numeric( implode( array_keys( $var ) ) ) ); } function is_assoc_array($var) { return (array_merge($var) !== $var || !is_numeric( implode( array_keys( $var ) ) ) ); } ?> If you are not concerned about the actual order of the indices, you can change the comparison to == and != respectively. ---- Server IP: 64.71.164.2 Probable Submitter: 64.179.48.194 ---- Manual Page -- http://www.php.net/manual/en/function.is-array.php Edit -- https://master.php.net/note/edit/73505 Del: integrated -- https://master.php.net/note/delete/73505/integrated Del: useless -- https://master.php.net/note/delete/73505/useless Del: bad code -- https://master.php.net/note/delete/73505/bad+code Del: spam -- https://master.php.net/note/delete/73505/spam Del: non-english -- https://master.php.net/note/delete/73505/non-english Del: in docs -- https://master.php.net/note/delete/73505/in+docs Del: other reasons-- https://master.php.net/note/delete/73505 Reject -- https://master.php.net/note/reject/73505 Search -- https://master.php.net/manage/user-notes.php