😕 It has a list of all the mcrypt functions available and how to use them, plus hundreds of comments and code snippets by people who have solved similar problems already.
Remember that unless you show a bit of willingness to put in some effort, and use your imagination, not many people here will be very willing to help you. And unless it's only a couple lines of code, or a something fairly trivial, even fewer people are likely to take the time to work up some code for a total stranger in return for a simple "Thank you!"