If you want to use WordPress functionality in a PHP file that exists outside of your WordPress installation then you need to include
wp-load.php. Perhaps you could call this “hooking into WordPress”.
Maybe you’re already using some sort of relative path method, like:
<?php include '../../../wp-load.php'; ?>
But this can create problems if directories change. You need a clean, dynamic way to get
wp-load.php. So here is the simplest way to do it, with just two lines of code (place it at the very top of your file):
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<?php $parse_uri = explode( 'wp-content', $_SERVER['SCRIPT_FILENAME'] ); require_once( $parse_uri . 'wp-load.php' ); ?>
Short and sweet
Disclaimer: This is intended for experimental and development purposes only. It is not advised to redundantly load WordPress on live production environments. But, why?