I am doing client customizations and i have multiple files. If for example i want to show the code of page 1.php on page home.php, how can i do it by echoing it or somethin
If including the scripts won't work, then you will need the workaround over the local webserver to merge just the contents (still need to cut out the content/body part):
print(file_get_contents("http://$_SERVER[SERVER_NAME]/page1.php"));
But a saner solution is most always just using an iframe and have the page inclusion handled by the browser:
Or more newfangled with some jQuery: