Quick question regarding debugging and PHP structure.

Short: Is it possible to see the PHP code that is going to be processed in whole? Long: I love to see things visually, and while programming i create all kinds of debugging variables i keep on the side for each page/request. I know this is possibly not possible since this has to be done from either the Zend Engine or PHP itself, but if i could see a complete output of all the code within my project that is used for a certain execution. Example: I call index.php?page=10 index.php includes functions.php and classes.php classes.php include page_classes.php if there is a $_GET["page"] variable set and product_classes.php if there is a $_GET["product"] variable set What i would like to see is the linear output of what code is included (so the data of functions.php, classes.php, then page_classes.php, and then index.php (not product_classes.php since its not included within this request) This is most likely possible with some PHP code but I'm thinking of trying to make sense of an old project i didn't create quickly and if this is possible it would help a lot.