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array_intersect — Returns an array containing elements that are present in all array arguments.


array array_intersect(array_1, array_2[, . . .]);
array array_1: First array to intersect
array array_2: Second array to intersect
array . . . (optional): Further arrays to intersect


Array on success; NULL on failure


This function accepts at least two arrays as arguments, and returns an array containing all elements that appear in all given array arguments. The keys of the resultant array are those of the matching elements from the first array argument.


PHP 4 since 4.0.1


Example 20. Calculate the intersection of three arrays

$array_1 = array('brown bat', 'fruit bat', 'wombat', 'baseball bat');
$array_2 = array('goatsucker', 'wombat', 'mongoose', 'mon ami');
$array_3 = array('wombat', 'goatsucker', 'mongoose', 'baseball bat');

$intersection = array_intersect($array_1, $array_2, $array_3);

/* Expected output:
 * Array
 * (
 *    [2] => wombat
 * )
 * Note that the key is '2', which is the matching key from the first array.

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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