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Use $pages['PAGE_KEY']

like $pages['home']

What do you mean by 'read'? This value is from $_POST['path']

You can find the code for saving page URL (in edit mode) in admin > controllers > pages.inc.php > below the line } elseif ($_GET['action'] == 'edit') { (almost at the bottom)

modify $f_path in...

Do you need the controller which saves the url value or mysql table where it's stored?