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# array_intersect

(PHP 4 )

array_intersect -- Computes the intersection of arrays

## Description

``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");`

> Note: Two elements are considered equal if and only if `(string) $elem1 === (string) $elem2`. In words: when the string representation is the same.

Warning
This was broken in PHP 4.0.4!

See also array_diff().

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