Is There A Website That Can Help Me Figure Out What Version is Necessary?

[yortzec]

I have a simple login form I have made in php, and I think I want to distribute it so others can use it. But, I want to tell the people who will use it what the minimum version of PHP is necessary for them to have in order for the login form to work. It might be a slow process to go through all my functions and look up the minimum necessary version. Is there a website anybody knows of that can do this for me?

[Mchl]

I don't think there is, and I don't really think it's an issue. There were just a few functions added since PHP 5.0 and for your own sake you shouldn't encourage anyone to use anything lower than 5.0.