502862 PHP script bug fixes and upgrades

I've had a PHP script developed which is working well and sold commercially. However, I'd like to continue developing it and my own PHP is not great. So what I need is a programmer who can quote me a per bug fix or upgrade price on an ongoing basis. A few hours a week and can fit in around your other work. The bug fixes and upgrades are things like fixing some compatibility issues for different servers. And adding new features to my PHP script. I know a bit of PHP but need to work with someone who is an expert. You need to be fast, friendly and a good communicator. The project could continue over several weeks or months. I'd like you to quote for each bug fix or upgrade and I say yes or no and you complete that item. Simple. If you'd like to see the php script to understand it more fully and then PM me. Thanks. Michael.