How to use array key exists in PHP

Posted in PHP | PHP Functions on August 22, 2019

In this article, I will explain how the array_key_exists() function can be used in PHP.

array_key_exists() function in PHP

The array_key_exists() function is used to checks an array for a specified key.
The array_key_exists() function is returns true if the key exists and false if the key does not exist.

Syntax

array_key_exists(key,array)

Parameter

key key is required parameter. Key to be searched.
array array is required parameter. The array determine whose keys will be checked.

Example

The following example show to how the array_key_exists() function can be used in PHP.

<html>

<body>

<h3 style="color: darkseagreen;">array_key_exists() function example in PHP</h3>

<?php

$a=array("a"=>"Nitin","b"=>"Ravi");

if (array_key_exists("a",$a))

{

echo "Array key exists!";

}

else

{

echo "Array key does not exist!";

}

</body>

</html>

Output

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