Can be hosted nearly everywhere.
It can be run on all major operating systems like Mac OS,Linux, UNIX, and Windows.
It supports all major web servers like Netscape, personal webserver, Apache, Microsoft IIS, iPlanet server, etc.
IT supports all major databases including MySQL, dBase, IBM DB2, InterBase, FrontBase, ODBC, PostgreSQL, SQLite, etc.
It has multiple layers of security to prevent threats and malicious attacks.
PHP is open source platform that is developed &updated by a large community of developers from around the world. Therefore its all components are available at free to use