The show_source() function prints out a syntax higlighted version of the code contained in filename using the colors defined in the built-in syntax highlighter for PHP. It returns TRUE on success, FALSE otherwise (PHP 4).
This function is an alias for the function highlight_file()
Note: Care should be taken when using the show_source() and highlight_file() functions to make sure that you do not inadvertently reveal sensitive information such as passwords or any other type of information that might create a potential security risk.
See also highlight_string(), highlight_file().