php translation

very fun kata, i spend a great time doing it.

but i had a bug when i tried to do sample tests,
when my function return the list of moves i have this message (it doesn't occur for full test data and i dit it on javascript Node v8.3.1):

TypeError: pos is not iterable
    at vf
    at _
    at example_tests.forEach
    at Array.forEach
    at describe
    at /runner/frameworks/javascript/cw-2.js:152:11
    at Promise._execute
    at Promise._resolveFromExecutor
    at new Promise
    at describe
    at /home/codewarrior/index.js:225:5
    at /home/codewarrior/index.js:271:5
    at Object.handleError