hhvm/hphp/test/quick/regalloc-fun.php

<?php

function main($a, $b, $c, $d, $e, $f) {
  $arr = array(1,2,3,4,5,6,7,8);
  var_dump($a, $b, $c, $d, $arr[2]);
}
main(1,2,3,4,5,6);