Php programmer needed to update my script

I'm running an article friendly script based on php and mysql, I need someone who has experience with such script to add some features in the admin section The additional features are as follows: 1-delete all articles that contain any of the keywords specified by the admin, for example I'll set bunch of keywords where the system should reject any article that contains any of those keywords 2-auto approve all articles that don't contain any of those keywords in an interval of time, for example, the admin will set the interval of auto approve to be 3 hrs, the system will approve all the articles that don't include any of the forbidden keywords I set before every 3 hrs 3-ability to stop the auto approve at any time 4-creating xml sitemap automatically after each day and also the admin will be able to stop the automatic creation at any time and set the interval of time to create the xml sitemap 5-deleting all articles after a certain period, this period will be set by the admin *the budget for those features shouldn't be more than $50 *You should have experience with article friendly script