How to determine if a PHP function is available

Determining if a PHP function is available

You can determine whether or not a PHP function is enabled for your web site by using the function_exists() function.

To determine if a function is available:

1. Create a file that contains the following code. This sample code checks to see if the fsockopen() function is available. To check for another function, change the $function_name variable’s value:<?php $function_name = “fsockopen”; if ( function_exists($function_name) ) { echo “$function_name is enabled”; } else { echo “$function_name is not enabled”; } ?>
2. Save the file as function.php or something similar.
3. Upload the file to your public_html directory.
4. Use your browser to go to http://example.com/function.php, where example.com represents your web site’s domain name. The page displays whether or not the function is enabled for your web site.