Question

在第二个foreach循环中，此行上出现非法偏移类型错误。

$userlist[$user]->addPeriod($period);

根据过去线程中提供的过去信息进行了一些更改，这是代码的新版本。还有一个警告但我认为如果错误得到解决可能会解决：

在非对象
上调用成员函数addPeriod（）

$periods_arr = array(1, 2, 3, 4, 5);
$subPeriods_arr = array(1, 2);
$questionslist = array("q_1_1", "q_1_2", "q_2_1", "q_2_2", "q_3_1", "q_4_1", "q_5_1");

class User {
    public $userId;
    public $periods = array();

    public function __construct($number)
    {
        $this->userId = $number;
    }

    public function addPeriod($pno)
    {
        $this->periods[] = new Period($pno);
    }
}

class Period {
    public $periodNo;
    public $subPeriods = array();

    public function __construct($number)
    {
        $this->periodNo = $number;
    }

    public function addSubPeriod($spno)
    {
        $this->subPeriods[] = new SubPeriod($spno);
    }
}

class SubPeriod {
    public $SubPeriodNo;
    public $answers = array();

    public function __construct($number)
    {
        $this->SubPeriodNo = $number;
    }

    public function addAnswer($answer)
    {
        $this->answers[] = new Question($answer);
    }
}

class Question {
    public $answer;

    public function __construct($ans)
    {
        $this->answer = $ans;
    }

    public function getAnswer()
    {
        echo $answer;   
    }
}        

$userlist = array();

$sql = 'SELECT user_ref FROM _survey_1_as GROUP BY user_ref ORDER BY user_ref ASC';
$result = mysql_query($sql);

while ($row = mysql_fetch_array($result))
{
    $userlist[] = new User($row['user_ref']);
}

foreach ($userlist as &$user)
{
    foreach ($periods_arr as &$period)
    {
        $userlist[$user]->addPeriod($period);

        foreach ($subPeriods_arr as &$subPeriod)
        {

            $userlist[$user]->periods[$period]->addSubPeriod($subPeriod);

            foreach($questionslist as &$aquestion)
            {
                $sql = 'SELECT ' . $aquestion . ' FROM _survey_1_as WHERE user_ref = ' .
                     $user . ' AND answer_sub_period = ' . $subPeriod . ' AND answer_period = ' . $period .''; 

                $result = mysql_query($sql);

                while ($row = mysql_fetch_array($result))
                {
                    $userlist[$user]->periods[$period]->subPeriods[$subPeriod]->addAnswer($row[$questionNumber]);
                }
            }
        }
    }   
}

$userlist[3]->periods[3]->subPeriods[1]->getAnswer();

Answer 1

您使用$user作为$userlist数组的键，但您将其作为值获取。尝试这样的事情：

foreach ($userlist as $user => $userVal)
{
    ...
    $userlist[$user]->addPeriod($period);
}

这会使$user成为$userlist数组的密钥。

做这样的事情会更清楚：

foreach ($userlist as $user)
{
}

然后不要将$user用作数组中的键，而只需使用$user作为值。例如：

$user->addPeriod($period);
...
$user->periods[$period]->addSubPeriod($subPeriod);

PHP非法偏移类型错误

1 个答案: