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PHP | Ds\Map diff() Function

Last Updated : 20 Mar, 2023
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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:

 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 
// 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 
// 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


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