PHP - the workhorse of scripting languages
The question on which medium or large site, the PHP scripting language is not actually used is difficult to answer - PHP is used on over 80% of all sites. Even our preferred Content Management System (TYPO3) is like so many other open source frameworks also based on PHP.
When we talk about PHP, just about all current approaches to programming such as object-oriented programming or MVC Patterns can be discussed.
But better don’t ask about the meaning of the term PHP. Or would you like to have terms like 'Recursive_Acronym' explained to you?