php_nub

i know. i just wanted to make one like this. i will database it eventually. i figured an encrypted string could be a partial fix. is there an encryption that can do something like this?

well to be honest it is to mask urls. im trying to make a tinyurl clone... so basically the longest url you can think of.

Hello, Im looking to encrypt any sting no matter how long (well to an extent) so it is only like 16 or so characters long. I was trying to use the crypt function wish a hash... but I found out that you can not decrypt that.... Anyone know of a encryption that is able to be decrypted that will leave a encrypted value around 16 characters?

I am trying to offer some hosting of websites for little to no cost, but i want the people who use my hosting to have my service advertised on their sites. is there a way to make a php script that checks all the html and php documents in a directory to see if my service is mentioned and if not add it in at the bottom of the page?