Hmm, not completly correct, you can use include witouth the (), but the correct way is like:
Code:
<?php
include("includes/header.php");
?>
And i dont recommend to use the full path for includes, just do it like above. If you want to use the full path, use the variable $_SERVER["DOCUMENT_ROOT"], where the /home/username/public_html is already stored in like:
Code:
<?php
include($_SERVER["DOCUMENT_ROOT"] . "/includes/header.php");
?>
And remember if you do that, use superglobals, in this case the super global $_SERVER, although $DOCUMENT_ROOT will also work, but thats for older versions of php.
Another nice thing about php is that you can configure the auto_append_file and auto_prepend_file, with a htaccess file.
This way, php will automatically add at the beginning/end of the php file the header and footer configured by these.