Fast Text Replace PHP Program

I need someone to develop a php program/function that does the following. 1) Given a content, the progrm should go thru each word and replace with similar word using thesaurus. (The user will enter content into a textarea form and push a button) 2) Display the original content and the modified content on the same page and hightlight or bold all words that have been replaced from the modified content. Here are the detailed requirements 1) I have a thesaurus data in a text file, which you will have to put into MYSQL database appropriately for easy and fast "search and replace" algorithm. You can provide a better thesaurus than the one I'm going to provide. 2) Optmize the SQL query so the the program executes as fast as possible. This is the most important part. The speed. 3) The program should IGNORE the "stopwords" and the ones that is not found in thesaurus. The list of stopwords can be found in <[login to view URL]> 4) If the word is not found in thesaurus, ignore the word. 5) The program should have an "aggression level" of 1 through 10. 1 means that every single word (excluding stopwords) found in thesaurus should be replaced. 10 means that one out of 10 words found in thesaurus should be replaced. 6) The user should be able to add, delete, and change words into the already built-in thesaurus. The program shouldn't be too difficult for an experienced php and MYSQL programmer. I probably could do this myself but I'm looking for a FAST and a reliable solution. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform PHP, Linux