array_intersect

Description

array_intersect() returns an array containing all the values of array1 that are present in all the arguments. Note that keys are preserved.

<?php
$array1 = array("a" => "green", "red", "blue");
$array2 = array("b" => "green", "yellow", "red");
$result = array_intersect($array1, $array2);
?>

Array
(
    [a] => green
    [0] => red
)

See also array_intersect_assoc(), array_diff(), and array_diff_assoc().