How to disable direct access to a file

Posted on 16th Feb 2014 by admin

Suppose I've 2 Files. 1.php & 2.php

I don't want anybody to access 2.php directly from browser. Eg: http://localhost/2.php but I want 2.php show up in 1.php like:
Line number On/Off | Expand/Contract<?phpinclude("2.php");?>

My question is how can I disable direct access using php not .htaccess

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