The PHP language syntax is very similar to the C and Perl programming languages. Perl scripts are generally used to accept web page form results and generate response pages, e-mail users, etc. All Perl scripts must have the .pl extension. Perl is extremely powerful and flexible, but the language can be very difficult for users to learn. All Server Parsed HTML files must have the .shtml, .stm, or .shtm extension.
Spaces are difficult to work with when users want to type in the URL directly.
Also, spaces in links occasionally do not work. Macintosh users be careful when moving your files up to the web server. Macintosh does not provide extensions for filenames automatically. File extensions are needed on our web server. Please make sure your files end in either .htm or .html.