note 70762 added to language.operators.comparison

When you want to know if two arrays contain the same values, regardless of the values' order, you cannot use "==" or "===". In other words: <?php (array(1,2) == array(2,1)) === false; ?> To answer that question, use: <?php function array_equal($a, $b) { return (is_array($a) && is_array($b) && array_diff($a, $b) === array_diff($b, $a)); } ?> A related, but more strict problem, is if you need to ensure that two arrays contain the same key=>value pairs, regardless of the order of the pairs. In that case, use: <?php function array_identical($a, $b) { return (is_array($a) && is_array($b) && array_diff_assoc($a, $b) === array_diff_assoc($b, $a)); } ?> Example: <?php $a = array (2, 1); $b = array (1, 2); // true === array_equal($a, $b); // false === array_identical($a, $b); $a = array ('a' => 2, 'b' => 1); $b = array ('b' => 1, 'a' => 2); // true === array_identical($a, $b) // true === array_equal($a, $b) ?> (See also the solution "rshawiii at yahoo dot com" posted) ---- Server IP: 64.71.164.2 Probable Submitter: 24.148.147.65 ---- Manual Page -- http://www.php.net/manual/en/language.operators.comparison.php Edit -- https://master.php.net/note/edit/70762 Del: integrated -- https://master.php.net/note/delete/70762/integrated Del: useless -- https://master.php.net/note/delete/70762/useless Del: bad code -- https://master.php.net/note/delete/70762/bad+code Del: spam -- https://master.php.net/note/delete/70762/spam Del: non-english -- https://master.php.net/note/delete/70762/non-english Del: in docs -- https://master.php.net/note/delete/70762/in+docs Del: other reasons-- https://master.php.net/note/delete/70762 Reject -- https://master.php.net/note/reject/70762 Search -- https://master.php.net/manage/user-notes.php