added missing prototype
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  added missing prototype
Merge branch 'PHP-5.6'

* PHP-5.6:
  added missing prototype
Added one more test for constant scalar expressions
Merge branch 'PHP-5.6'

* PHP-5.6:
  Added one more test for constant scalar expressions
Merge branch 'master' into str_size_and_int64