I tried to install this PHP 5.4 by manually and follow exactly all steps based on this site http://www.php-tutorials.info/installPHP.php.
But I encounter a problem when comes to Editing Apache Configuration (refer to
5.2. Apache 2.2.x
based on the link attached) where I cannot save my editing. Whenever I tried to save it, an error message will appear saying that "Access is denied".