PHP is a widely used Open Source server-side general-purpose scripting language that is specially suited for Web development and can be embedded into HTML. Its syntax draws upon, Java, and Perl, and is easy to learn. PHP runs on many different platforms and can be used as a standalone executable or as a module under a variety of web servers.
It has excellent support for databases, XML, LDAP, IMAP, Java, various Internet protocols, and general data manipulation, and is extensible via its powerful API. It is actively developed and supported by a talented and energetic international team. Numerous open source and commercial PHP-based application packages are available.
Its an open source Language.
The data types and structures of PHP are easy to use and understand, because can identify PHP what you mean, and convert types automatically.
You don't have to know everything there is to know about PHP to start writing useful programs.
Knowledge of PHP can help you in learning the C language, because its syntax and constructs are similar to the later.
PHP doesnt necessarily require a program compilation, because it runs right on the web browser.
PHP operations can be done in other languages too.