As opposed to ASP, PHP needs no special software to program with.
ASP is the Microsoft product, which will assure that there are upgrades to buy (they will see to it).
PHP is open source free software with more than three million websites using it. Upgrades are performed for you by others.
The bottom line is we chose PHP because it is relatively easy to learn and modify.
It has a large open source following, which means people are constantly improving on it for you.
It is FREE! this cuts overhead and eliminates forced upgrades. There is no software company with a vested interest in you buying upgrades.
Because it is open source, PHP will keep moving forward, and being improved upon.
There are many pre-written PHP scripts. Many free some for a nominal charge. These cover the basic functioning needed for almost any application.
Offers quicker and cheaper deployment and troubleshooting when starting with pre-written scripts.
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