1)PHP is a server-side interpreter which is Open Source and free;
2)So is a growing number of PHP web applications - start at PHP Resources;
3)PHP provides familiar syntax to C, Perl and Java developers;
4)PHP has fast connections to popular databases;
5)PHP has fast native connections to the Open Source MySQL database;
6)PHP runs reliably on Windows, Linux and Mac servers and clients;
7)PHP web pages run reliably on all the popular browsers;
8)PHP’s associative arrays are very useful for UI and database apps;
9)PHP’s object oriented classes are easy to understand;
10)PHP has been very promiscuous-linking to PDF, SWF, XML, Java, etc.