note 41887 deleted from function.in-array by danbrown

Note Submitter: php at NOSPAM dot fastercat dot com ---- The description of in_array() is a little misleading. If needle is an array, in_array() and array_search() do not search in haystack for the _values_ contained in needle, but rather the array needle as a whole. $needle = array(1234, 5678, 3829); $haystack = array(3829, 20932, 1234); in_array($needle, $haystack); --> returns false because the array $needle is not present in $haystack. Often people suggest looping through the array $needle and using in_array on each element, but in many situations you can use array_intersect() to get the same effect (as noted by others on the array_intersect() page): array_intersect($needle, $haystack); --> returns array(1234). It would return an empty array if none of the values in $needle were present in $haystack. This works with associative arrays as well.