title: Code encryption - encryption of a single file in a PHP script without extensions
body: <p>Is it possible to encrypt a PHP code file without installing php.in extensions? </p>
  
  <p>I have a script of 5 php file and I want to create a copy to give away with the code protected. So they can access the script from the front-end but the back-end (code) is encrypted. I have found alot of software that allow encryption of php be but they all require installation of php.in extensions.</p>
  
  <p>Is there anything embedded into Php 5.5 that would work similar to MD5 password encryption?</p>