PHP Manual: Computes the intersection of arrays

Description

array array_intersect(array $array, array ...$arrays)

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

Parameters

array: The array with master values to check.
arrays: Arrays to compare values against.

Return Values

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

Changelog

Version	Description
8.0.0	This function can now be called with only one parameter. Formerly, at least two parameters have been required.

Examples

Example #1 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
)

Notes

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

array_intersect