How can PHP include files be restricted server-side to prevent access to a website?

To restrict access to PHP include files server-side, you can use the `exit()` function to stop the script execution if the file is accessed directly. This prevents users from accessing the file directly and only allows it to be included within other PHP files. 

<?php
if(basename(__FILE__) == basename($_SERVER["SCRIPT_FILENAME"])){
    exit("Access denied!");
}
// Rest of the code goes here

Keywords

PHP include files server-side access restriction website

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