Using array_intersect_assoc() to Compute Array Intersection with Index Check in PHP

The PHP function array_intersect_assoc() returns an array containing all values from the first array that are also present in all other arrays, comparing both values and keys.

Parameters array1 – The first array to compare. array2 – The second array to compare with the first. array... – Additional arrays to compare.

Return value

An array of the intersecting values with matching keys.

Example

<?php
$array1 = array("a"=>"green","b"=>"brown","c"=>"blue","d"=>"red");
$array2 = array("a"=>"green","b"=>"yellow","c"=>"blue","red");
$result_array = array_intersect_assoc($array1, $array2);
print_r($result_array);
?>

Output

Array
(
    [a] => green
)