fix unstable test
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  fix unstable test
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  fix unstable test
Merge branch 'PHP-5.6'

* PHP-5.6:
  fix unstable test
update NEWS
Merge branch 'PHP-5.6'

* PHP-5.6:
  update NEWS