PHP array_intersect() – Compute the Intersection of Arrays

The array_intersect() function returns an array containing all the values that are present in the first array and also appear in all other arrays passed as arguments, preserving the original keys.

Signature:

array_intersect(array $array1, array $array2, array ...$arrays): array

Parameters:

$array1 – The first array to compare.

$array2 – An array to compare against the first array.

...$arrays – Additional arrays to compare.

Return value: An array containing the values that exist in $array1 and in every other array supplied.

Example:

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

Output:

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