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Allowing to post links after some good forum posts only

I run a forum and I would like to limit the function to post links at my website. Only users who already posted some good forum posts should be able to post links or a link signature. I realized my forum with Drupal 7 cms. I also have some voting system installed so that people can vote the answers. So I already have a number which can judge the process.  

I am relatively new in building custom modules with PHP. Can anybody show me a solution in PHP for this? I will get it implemented into a custom module there.

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