(PHP4 >= 4.0.1)

array_intersect -- Computes the intersection of arrays


array array_intersect (array array1, array array2 [, array ...])

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

Example 1. Array_intersect() example

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

This makes $result have array ("a" => "green", "red");

See also array_diff().