PHP - Function array_key_exists()

Syntax

bool array_key_exists ( $key, $array );

Definition and Usage

It returns TRUE if the given key is set in the array.

Parameters

Sr.No	Parameter & Description
1	key(Required) The key to be searched.
2	array(Required) This is an array to be searched

Parameter & Description

key(Required)

The key to be searched.

array(Required)

This is an array to be searched

Return Values

It Returns TRUE if the given key is set in the array otherwise FALSE.

Example

Try out following example −

Live Demo

<?php
   $input = array('first' => 10, 'second' => 400);
   
   if (array_key_exists('first', $input)) {
      echo "The 'first' element is in the array";
   }
?>

This will produce the following result −

The 'first' element is in the array

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