Q&A Script (PHP)

Hey guys, I am looking for a php script for a new website.
It involves the following:
-User asks question
-Only admin can respond to questions
-Question must be approved by admin
-Question + answer is then archived on the website in a certain category

I haven’t been able to find a script like that, preferably free, but willing to pay some money.

If you could lead me in the right direction that would be great.
Thanks for your time.

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