title: Need a safe way to execute external code
body: <p>I was wondering if it was possible to allow people to write and execute PHP code from my website without the use of "eval" due to risks.
  I have googled around and I did find some answers, just not the answers I was looking for (call_user_func).
  This is not what I am looking for as it does not allow people to run a full PHP script.</p>
  
  <p>It's a small group of people executing it so server load will not be an issue.</p>
  
  <p>edit 1: Users should not be able to corrup/delete files;
  Users should be able to create complete scripts.;
  Users should be able to run html code but trigger php as soon as php tags are used.</p>