How to use array_diff_key() function In PHP

This function is used to get the difference between one or more arrays. This function compares the keys between one or more arrays and returns the difference between them.

Syntax:

array array_diff_key( $array_name, array_flip((array) ['keys_to_be_removed'] )

Program:

PHP

<?php

// Declare an associative array
$arr = array( 
    "1" => "a",
    "2" => "b",
    "3" => "c"
);

// Remove the key 1 and its value
// from associative array
$result = array_diff_key($arr, 
            array_flip((array) ['1']));

// Display the result
print_r($result);

?>

Output

Array
(
    [2] => b
    [3] => c
)

How to remove a key and its value from an associative array in PHP ?

Given an associative array containing array elements the task is to remove a key and its value from the associative array.

Examples:

Input : array( "name" => "Anand", "roll"=> "1")
Output : Array (
    [roll] => 1
)

Input : array( "1" => "Add", "2" => "Multiply", "3" => "Divide")
Output : Array (
    [2] => Multiply
    [3] => Divide
)