PHP | Ds\Map diff() Function

The Ds\Map::diff() function is an inbuilt function in PHP which is used to create a map using the key which contains the elements of the first map which are not present in another map.

Syntax:

Ds\Map public Ds\Map::diff( $map )

Parameters: This function accepts a single parameter $map which is used to hold the map elements whose value need to be excluded.

Return value: It returns a new map containing the elements of the first map which are not present in another map.

Below programs illustrate the Ds\Map::diff() function in PHP:

Program 1:

<?php
// PHP program to illustrate the diff()
// function of Ds\map

// Creating a Map
$map1 = new \Ds\Map(["1" => "10",
            "3" => 30, "4" => 40]);

// Creating another Map
$map2 = new \Ds\Map(["2" => "20",
        "3" => 35, "5" => 50, "6" => 60]);

echo "Difference between two map: <br>";

print_r($map1 -> diff($map2));

?>

Output:

Difference between two map: 
Ds\Map Object
(
    [0] => Ds\Pair Object
        (
            [key] => 1
            [value] => 10
        )

    [1] => Ds\Pair Object
        (
            [key] => 4
            [value] => 40
        )

)

Program 2:

<?php
// PHP program to illustrate the diff()
// function of Ds\map

// Creating a Map
$map1 = new \Ds\Map([
    "1" => "Geeks",
    "2" => "for",
    "3" => "Geeks"]);

// Creating another Map
$map2 = new \Ds\Map([
    "2" => "for",
    "3" => "Geeks",
    "4" => "GeeksforGeeks"]);

echo "Difference between two map: <br>";

print_r($map1 -> diff($map2));

?>

Output:

Difference between two map: 
Ds\Map Object
(
    [0] => Ds\Pair Object
        (
            [key] => 1
            [value] => Geeks
        )

)

Reference: https://www.php.net/manual/en/ds-map.diff.php