note 120099 added to function.array-intersect

The reason that this function is considerably slow; is because it's comparing not only the values cross wise; but it also compares the array's own elements too. For example you have two arrays like; <?php $arr1 = array('green', 'blue', 'black'); $arr2 = array('yellow', 'red', 'cyan'); array_intersect($arr1, $arr2); ?> Intersection will start to compare from the first three colors like; "blue" to "green", "black" to "blue"; that are, the elements of the first array only, and yes, comparison order is arbitrary, but always in the same order. It will do the same for the second array too. ---- Server IP: 72.52.91.14 Probable Submitter: 31.155.70.152 ---- Manual Page -- http://php.net/manual/en/function.array-intersect.php Edit -- https://master.php.net/note/edit/120099 Del: integrated -- https://master.php.net/note/delete/120099/integrated Del: useless -- https://master.php.net/note/delete/120099/useless Del: bad code -- https://master.php.net/note/delete/120099/bad+code Del: spam -- https://master.php.net/note/delete/120099/spam Del: non-english -- https://master.php.net/note/delete/120099/non-english Del: in docs -- https://master.php.net/note/delete/120099/in+docs Del: other reasons-- https://master.php.net/note/delete/120099 Reject -- https://master.php.net/note/reject/120099 Search -- https://master.php.net/manage/user-notes.php