Use memcmp here is better
Merge branch 'PHP-5.6'
fixed possibly uninitialized value usage
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  fixed possibly uninitialized value usage
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  fixed possibly uninitialized value usage
Merge branch 'PHP-5.6'

* PHP-5.6:
  fixed possibly uninitialized value usage