SQL PHP HTML ASP JavaScript articles and free scripts to download
PHP Declaring Variables

defined()

Before using any constants in our script we can check if it exist or not by using defined() function. We will get Ture of False as return from this function. Here is an example.
define("SITE",'plus2net');
if(defined('SITE')){
echo "Constant SITE exist";
}else { echo "Constant doesn't exist";}

While using the constant name always keep them within quotes like defined('SITE')

To check the variables we use isset()
To check the functions we use function_exists()
To check the constants we use defined()

Be the first to post comment on this article :


Google+
Post Comment This is for short comments only. Use the forum for more discussions.
Name
Email( not to be displayed)Privacy Policy
1+2=This is to prevent automatic submission by spammers. Please enter the result of the sum as asked



Join Our Email List
Email:  
For Email Newsletters you can trust
HTML . MySQL. PHP. JavaScript. ASP. Photoshop. Articles. FORUM Contact us

©2000-2014 plus2net.com All rights reserved worldwide Privacy Policy Disclaimer