How to use array_key_exists() Function In PHP

If you want to search for a key in an associative array, array_key_exists() is the right function to use. It checks if the given key or index exists in the array. The array_key_exists() function checks if the key “C” exists in the associative array.

Example: This example shows the use of array-key_exists() function for searching an item in an array.

PHP

<?php

$arr = array(
    'A' => 10, 
    'B' => 20, 
    'C' => 30, 
    'D' => 40, 
    'E' => 50
);

$itemKey = 'C';

if (array_key_exists($itemKey, $arr)) {
    echo "$itemKey exist in array.";
} else {
    echo "$itemKey not exist in array.";
}

?>