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PHP | Ds\Map remove() Function

Last Updated : 30 Jul, 2019
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The Ds\Map::remove() function is an inbuilt function in PHP which is used to remove and return a value by key. Syntax: 
mixed Ds\Map::remove( $key, $default )
Parameters: This function accepts two parameters as mentioned above and described below:
  • $key: It holds the key value which need to remove.
  • $default: It is optional parameter and it returns if key not found.
Return Value: This function returns the value that was removed. Exception: This function throws OutOfRangeException if the key not exist and value of $default is not provided. Below programs illustrate the Ds\Map::remove() function in PHP: Example 1: php 
<?php 

// Declare new Map 
$map = new \Ds\Map([
    1 => "geeks",
    2 => "for", 
    3 => "geeks",
    4 => "DataStructures"
]); 

echo("Map Elements\n"); 

// Display the map elements 
print_r($map); 

echo("\nRemoved element of the map: \n"); 

// Use remove() function to remove 
// value at index 3 and return it 
var_dump($map->remove(3)); 

?>
Output: 
Map Elements
Ds\Map Object
(
    [0] => Ds\Pair Object
        (
            [key] => 1
            [value] => geeks
        )

    [1] => Ds\Pair Object
        (
            [key] => 2
            [value] => for
        )

    [2] => Ds\Pair Object
        (
            [key] => 3
            [value] => geeks
        )

    [3] => Ds\Pair Object
        (
            [key] => 4
            [value] => DataStructures
        )

)

Removed element of the map: 
string(5) "geeks"
Example: php 
<?php 

// Declare new Map 
$map = new \Ds\Map([
    "a" => "geeks",
    "b" => "for", 
    "c" => "geeks",
    "d" => "DataStructures"
]); 

echo("Map Elements\n"); 

// Display the map elements 
print_r($map); 

echo("\nRemoved element of the map: \n"); 

// Use remove() function to remove 
// value at index 3 and return it 
var_dump($map->remove("c")); 

?>
Output: 
Map Elements
Ds\Map Object
(
    [0] => Ds\Pair Object
        (
            [key] => a
            [value] => geeks
        )

    [1] => Ds\Pair Object
        (
            [key] => b
            [value] => for
        )

    [2] => Ds\Pair Object
        (
            [key] => c
            [value] => geeks
        )

    [3] => Ds\Pair Object
        (
            [key] => d
            [value] => DataStructures
        )

)

Removed element of the map: 
string(5) "geeks"
Reference: https://www.php.net/manual/en/ds-map.remove.php

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