Heya, Sayera. Welcome to TSDN!
If you can't code it yourself, I'm afraid you've come to the wrong place. TSDN exists to help developers fix problems and figure out solutions, but all TSDN members are expected to write their own code.
If you want someone to do your coding for you, allow me to recommend my employer.
If outsourcing is not an option, there are solutions that involve a minimum of coding. For PHP, you can integrate into Apache's authentication model pretty easily.
Check out
this article and post back anytime if you have any questions.