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.
There are thousands.
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.
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..
something
advantages and disadvantages of transfer function?
Ultimately PHP is a programming language and MySQL is a database language. Using PHP with MySQL is a nice combination with built-in support and the simplicity of it all. However, there aren't a lot of disadvantages of using PHP with a database, it just allows for better data organization and whatnot. There are definitely advantages and disadvantages to using a database other than MySQL (such as MongoDB or PostgreSQL).
good
discuss database and field functions
Advantages: Easy to maintain and Less time wasted if you needed to change one script Disadvantages: Time-Consuming when you're converting and con't work in DW properley.
Advantages and Disadvantages of equity
advantages and disadvantages
http://www.php.net/quickref.php
There are thousands.
advantages and disadvantages of recession
what are the disadvantages and advantages of antipyretic