PHP is fast, stable, secure, easy to use and open source (free)..                                          
70% Website made in PHP Language.                       
Use Wamp as Server.Use Dreamviewer as Editor.

The world’s most popular open source database.
It is a  free, fast, reliable open source relational database.
MySql has a good power these days

ASP is Scripting Language.
ASP.NET is arguably one of the most sophisticated website programming languages in the marketplace today, and a great technology to build web application.
It is Easy Programming Model .

SQL Server is RDBMS software from Microsoft.
(It provides data backend for the web application).
Microsoft SQL Server is a computer application used to create desktop, enterprise, and web-based database systems.
Sql Server is recently use with asp