php mysql add content on fly

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PHP

hi im building a website for a friend and i need help on being able for him to add entries on the fly. basically its a beauty products showcase in different categories which will display different product information including picture and prices. i want him to add or edit an entry while keeping the layout of the website.

can someone point me in the right direction. if there is a ready made script for this type of stuff i'd really appreciate if someone can link me to it otherwise maybe a tutorial with easy to follow directions.

appreciate any help i get