PHP array_key_exists() Function

PHP array_key_exists() Function is used to check if given key exists in the array. If it returns true, then key exists. If it returns false, then key does not exist. PHP array_keys() function is PHP built-in function.

Syntax :

array_key_exists(string|int $key, array $array);

Parameter,

$key : Required. It is key to be checked in array.

$array : Required. It is input array.

Return : It returns true if the given key or index exists in the array otherwise it returns false.

Let's see below example to understand php array_key_exists() Function in details.

Example :

<?php
$array=array("Samsung"=>"M30s","MI"=>"Note 8 pro","iPhone"=>"12 pro","Nokia"=>"X20");
echo "<br>It returns true or false. <br>";

if (array_key_exists("Nokia",$array))
{
echo "Key exists in array!";
}
else
{
echo "Key does not exist in array!";
}
?>