fix invalid variable name at ext/spl/internal/multipleiterator.inc
fix invalid variable name at ext/spl/internal/multipleiterator.inc (key() method, too)
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  fix invalid variable name at ext/spl/internal/multipleiterator.inc (key() method, too)
  fix invalid variable name at ext/spl/internal/multipleiterator.inc