array_intersect

(PHP 4 >= 4.0.1, PHP 5, PHP 7)

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.

Parameters:

array1

The array with master values to check.

array2

An array to compare values against.

...

A variable list of arrays to compare.

Returns:

Returns an array containing all of the values in array1 whose values exist in all of the parameters.

Notes:

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

Examples:

array_intersect() example

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

The above example will output:

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