message: Added php high version requirements.
diff: @@ -138,6 +138,10 @@ extern swoole_object_array swoole_objects;
  #endif
  #endif
  +#if PHP_MAJOR_VERSION == 5 && PHP_MINOR_VERSION < 5
  +#error "require PHP version 5.5 or later."
  +#endif
  +
  #include "php7_wrapper.h"
  #define PHP_CLIENT_CALLBACK_NUM 4
  