I am essentially trying to combine to PHP statements.
<?php echo ROOT_PATH; ?>
<?php echo file_get_contents( "../css/themes/subtitle.php"); ?>
I want to achieve something like this:
<?php echo file_get_contents( "ROOT_PATH/css/themes/subtitle.php"); ?>
Its pretty simple you can change it to following
//full path of the file
$file_name = ROOT_PATH."/css/themes/subtitle.php";
echo file_get_contents($file_name);
it should work