Fixed bug #65915 (Inconsistent results with require return value)
Fixed compatibility with old PHP versions
Fixed bug #65559 (Opcache: cache not cleared if changes occur while running)
Merge branch 'opcache' of ../php5.5

* 'opcache' of ../php5.5:
  Fixed bug #65559 (Opcache: cache not cleared if changes occur while running)
  Fixed compatibility with old PHP versions
  Fixed bug #65915 (Inconsistent results with require return value)