To make something accessible you need to let people learn it one small chunk at a time. PHP lets you ease in, starting at html with some inserted php code and

To make something accessible you need to let people learn it one small chunk at a time. PHP lets you ease in, starting at html with some inserted php code and working your way up to more complex code. CGI, at least as I recall, required you to return valid HTTP responses with correct headers. That's a big jump from simple HTML.