PHP Programing language

Introduction to PHP

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Syntax In PHP

Variable Types In PHP

Constants In PHP

Operator In PHP

Decision Making In PHP

Loop Types In PHP

Arrays In PHP

Arrays function

Strings In PHP

string function

GET & POST

File Inclusion In PHP

Files & I/O In PHP

Functions In PHP

Cookies In PHP

Sessions In PHP

Sending Emails In PHP

Echo / Print In PHP

Form Handling In PHP

Forms In PHP

File Handling In PHP

Error Handling In PHP

Object Oriented In PHP

Exception In PHP

Filters In PHP

References In PHP

PHP Zip

PHP Calendar

Arrays function

String function

SQL In PHP

XML in php

Ajax In PHP

PHP Magic-Quotes

PHP HTML-Entities

PHP Basic Tutorials With MySQL

PHP subjective question

PHP Interview question

PHP Objective question

PHP FAQS

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: