PHP/SQL多重插入不起作用

我不能一次插入两个标签。 它只插入其中的1个（在本例中，它插入第一个）

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问题是因为您

返回了第一个
mysql\u查询
，其余的将不会执行。请尝试这样删除它

function addNewUser($username, $password, $email){
      $time = time();
      /* If admin sign up, give admin user level */
      if(strcasecmp($username, ADMIN_NAME) == 0){
         $ulevel = ADMIN_LEVEL;
      }else{
         $ulevel = USER_LEVEL;
      }
    $datumregistrationbla = date("d.m.Y");
      $q = "INSERT INTO ".TBL_USERS." (username, password, email, userlevel, register_date) VALUES ('$username', '$password', '$email', '$ulevel', '$datumregistrationbla')";
      mysql_query($q, $this->connection);
      $q = "INSERT INTO `post` (`post_id`, `from`, `to`, `betreff`, `text`, `datum`, `active`) VALUES ('', 'Fuchsfeuer', '$username', 'Test', 'Test2', '$datumregistrationbla', '0')";
      mysql_query($q, $this->connection);
   }

请忘记使用mysql，因为它已被弃用，并且在PHP7中已被删除

尝试使用或

function addNewUser($username, $password, $email){
      $time = time();
      /* If admin sign up, give admin user level */
      if(strcasecmp($username, ADMIN_NAME) == 0){
         $ulevel = ADMIN_LEVEL;
      }else{
         $ulevel = USER_LEVEL;
      }
    $datumregistrationbla = date("d.m.Y");
      $q = "INSERT INTO ".TBL_USERS." (username, password, email, userlevel, register_date) VALUES ('$username', '$password', '$email', '$ulevel', '$datumregistrationbla')";
      mysql_query($q, $this->connection);
      $q = "INSERT INTO `post` (`post_id`, `from`, `to`, `betreff`, `text`, `datum`, `active`) VALUES ('', 'Fuchsfeuer', '$username', 'Test', 'Test2', '$datumregistrationbla', '0')";
      mysql_query($q, $this->connection);
   }