PHP Challenges

Please check the challenges at [login to view URL] I need someone to code all of them for me, expect the last 7 Realistic challenges. You will need to write functions which would take input and return a true or false to indicate if the input is correct and the user has cleared the challenge. Make sure you know how to code in a secure manner as I dont want exec or anything running on my server and all the code should run in such a manner that it does not question the security of the server it self.