PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML
PHP has been created in 1994 by Rasmus Lerdorf(named 'Personal Home Page Tools' then). He has made it aviable as Open Source.
The community furtherdevelopped the language. In the meantime PHP is a script language very common in the WEB.(PHP now stands for 'PHP HyperTextPreprocessor')
It's benefits are:
See http://www.php.net for more information