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I think this best way to prevent direct access..

<?php if (!defined('ABSPATH')) { exit; }?>

i have used this on all my php files..can it create problems? any files on WordPress theme i should not use it?

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The point of that code is to prevent any PHP inside the file from being executed if the file is accessed directly outside a WordPress context. ABSPATH is defined by WordPress, so if it's missing when the file is accessed you can tell that it's not running in a WordPress context.

So the only place you wouldn't use it is in any file that you did need to access directly. There probably shouldn't be any such files in a WordPress theme or plugin. The most common example might be a file for handling AJAX requests, but in WordPress you should be using admin-ajax.php or the REST API for that sort of thing.

  • hi, What about the class files with namespace it's not possible to put this code ? am i required to put this code there – Latheesh V M Villa Nov 16 '18 at 12:44
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    It just needs to go after the namespace declaration, but before the class. – Jacob Peattie Nov 16 '18 at 12:49

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