message: serialize use ZEND_STRL
diff: @@ -1242,7 +1242,7 @@ static zend_class_entry* swoole_try_get_ce(zend_string *class_name)
  return NULL;
  }
  - zend_string *fname = swoole_string_init(PG(unserialize_callback_func), strlen(PG(unserialize_callback_func)));
  + zend_string *fname = swoole_string_init(ZEND_STRL(PG(unserialize_callback_func)));
  Z_STR(user_func) = fname;
  Z_TYPE_INFO(user_func) = IS_STRING_EX;
  ZVAL_STR(&args[0], class_name);
  @@ -1282,7 +1282,7 @@ static void* swoole_unserialize_object(void *buffer, zval *return_value, zend_uc
  zend_string *class_name;
  if (flag == UNSERIALIZE_OBJECT_TO_STDCLASS)
  {
  - class_name = swoole_string_init("StdClass", 9);
  + class_name = swoole_string_init(ZEND_STRL("StdClass"));
  }
  else
  {
  @@ -1368,10 +1368,10 @@ static void* swoole_unserialize_object(void *buffer, zval *return_value, zend_uc
  //call object __wakeup
  - if (zend_hash_str_exists(&ce->function_table, "__wakeup", sizeof ("__wakeup") - 1))
  + if (zend_hash_str_exists(&ce->function_table, ZEND_STRL("__wakeup")))
  {
  zval ret, wakeup;
  - zend_string *fname = swoole_string_init("__wakeup", sizeof ("__wakeup") - 1);
  + zend_string *fname = swoole_string_init(ZEND_STRL("__wakeup"));
  Z_STR(wakeup) = fname;
  Z_TYPE_INFO(wakeup) = IS_STRING_EX;
  call_user_function_ex(CG(function_table), return_value, &wakeup, &ret, 0, NULL, 1, NULL);
  