Functions in strings with PHP as templates

Although you can use variables within strings in PHP, you can’t do functions. Well, not quite. If your function name begins with a dollar sign ($), it works fine. You can exploit this to call non-object functions such as htmlspecialchars.

It’s still not as clean as if you had separated application logic and presentation code like you should have. I really don’t recommend doing this, but it’s an interesting approach.