PHP Programing language

array_key_exists()

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

array_key_exists(key,array)

In above syntax,"key" specifies the key and "array" specifies an array

Example:

<?php
$a=array("Apple"=>"fruit","Mango");
if (array_key_exists("Mango",$a))
   {
   echo "Key exists!";
   }
else
   {
   echo "Key does not exist!";
   }
?>

Output: