What is PHP?

PHP (Hypertext Preprocessor) is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML.

here I would use bullet points rather than long long paras!

• PHP is a server side scripting language, in contrast to client side scripting language e.g. javaScript. Its means it execute on server generating HTML which is then send to client.You can also use server side technologies with PHP.
• PHP is belong to LAMP (Linux, Apache, MySQL, PHP,Perl or Python) family. they all are open source and free to use, have very strong community.
• PHP is used to build rich dynamic web sites from basic to enterprise level.  Facebook is also based on it.
• PHP suppose to be a very fast executing language.
• Easy to learn and understand.
• Very big and strong community, You will find almost anything you want.
• PHP 5 and greater has much improved OOP facilities.
• There are number of good php frameworks which can be used to build extensive dynamic applications.  Some famous frameworks are Codeigniter, CakePHP, Zend, Symfony.