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:Â
php
<?php // PHP program to illustrate the diff() // function of Ds\map Â
// Creating a Map $map1 = new \Ds\Map(["1" => "10",             "3" => 30, "4" => 40]);              // Creating another Map $map2 = new \Ds\Map(["2" => "20",        "3" => 35, "5" => 50, "6" => 60]); Â
echo "Difference between two map: <br>";Â
print_r($map1 -> diff($map2));Â
?> |
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:Â
php
<?php // PHP program to illustrate the diff() // function of Ds\map Â
// Creating a Map $map1 = new \Ds\Map([    "1" => "Geeks",     "2" => "for",    "3" => "Geeks"]);             // Creating another Map $map2 = new \Ds\Map([    "2" => "for",    "3" => "Geeks",    "4" => "neveropen"]);Â
echo "Difference between two map: <br>";Â
print_r($map1 -> diff($map2));Â
?> |
Output:
Difference between two map:
Ds\Map Object
(
[0] => Ds\Pair Object
(
[key] => 1
[value] => Geeks
)
)
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