There are thousands.
Chat with our AI personalities
See the related links for a shortcut to the entire reference of every function in PHP. The default built-in functions differ from the categories of extensions you choose to install, and the version of PHP you're installing - therefore, it's impossible to give a stable list of built-in functions.
PHP 6 hasn't been released yet.
There are too many (hundreds) functions for there to be an answer to this. Advantages are that they can be used server side to print output that can be translated from databases etc. Disadvantages it that it can delay the loading time of all you pages.
A framework in PHP is a set of prebuilt classes and functions (like cakePHP.org or codeignitor) that let's you add basic classes and write less do more.
if i got your question right, you mean "what are php tags?" your should write PHP codes between <?php ... ?> where ... should be replaced by codes that you need. But if you mean "what are php codes?": there are some default codes that you may find them on php.net, and the other part is codes (Functions or classes) that other programmers develops..