array_intersect_key_recursive¶

Recursively computes the intersection of arrays using keys for comparison.

Description¶

array_intersect_key_recursive ( array $array1, array $array2 ) : array

Returns an array containing all the entries of array1 which have keys that are present in $filter, recursively. See array_intersect_key().

Parameters¶

array1¶

The array with master keys to check.

array2¶

An array to compare keys against.

Return Values¶

Returns an associative array containing all the entries of array1 which have keys that are present in array2.

Examples¶

<?php
$array1 = array(
    'a' => [
        'blue'  => 1,
        'red'  => 2,
        'green'  => 3,
        'purple' => 4,
    ],
    'b' => [
        'c' => [
            'blue'  => 1,
            'red'  => 2,
            'green'  => 3,
            'purple' => 4,
        ],
    ],
);
$array2 = array(
    'a' => [
        'green' => 5,
        'blue' => 6,
        'yellow' => 7,
        'cyan'   => 8,
    ],
    'b' => [
        'c' => [
            'red' => 5,
            'purple' => 6,
            'yellow' => 7,
            'cyan'   => 8,
        ],
    ],
);
print_r ( array_intersect_key_recursive ( $array1, $array2 ) );
?>

The above example will output:

Array
(
    [a] => Array
        (
            [blue] => 1
            [green] => 3
        )

    [b] => Array
        (
            [c] => Array
                (
                    [red] => 2
                    [purple] => 4
                )

        )

)