title: php command path issue when running multiple xampp OR multiple php version in a single xampp
body: <p>I'm running two xampps as xampp56 and xampp72 on my windows. </p>
  
  <p><strong>The problem is</strong> when im trying to run composer commands.
  i had php's path set to <code>c:/xampp/php</code> from my previous xampp installation.</p>
  
  <p>now since that directory is no more i can't run php command from anywhere. 
  is there an elegant solution for this? a solution that would still enable to run composer. phar without having to use absolute path for each php implementation</p>