Codeigniter中的数组到字符串的转换错误 [英] Array to string conversion error in Codeigniter

问题描述

我正在尝试从数据库向视图显示平均结果，但我不断收到此错误:

I'm trying to display an average result from the database to the view but I keep getting this error:

遇到PHP错误

严重性:通知

消息:数组到字符串的转换

Message: Array to string conversion

文件名:views/resultview.php

Filename: views/resultview.php

行号:38

这是控制器中的代码:

$average['avg'] = $this->quiz->getAverage($quizid);

$this->load->view('resultview',array('quiz' => $quiz,
                                     'score' => $score, 
                                     'average_score' => $average));

该模型的功能如下:

   function getAverage($quiz) 
    {
    //get percentage from the database 

    $this->db->select_avg('score');
    $this->db->where('id', $quiz);
    $res = $this->db->get('userScoreQuiz');

    if ($res->num_rows() != 1) {
        // there should only be one row - anything else is an error
        return false;
    }
    return $res->result_array();
}

以及从视图中看到的代码是

and the code from the view it is:

<h4> Avg. score on all previous attempts: <?php echo $average_score['avg'] ?>   %</h4> 

我无法找出原因.

谢谢您的帮助.

推荐答案

您正在进行的代码过多，这是一种优雅的解决方案:

That's too much of coding you got going on, Here is an Elegant solution:

function getAverage($quiz)
{
    //get percentage from the database
    $query = $this->db->select('AVG(score) as average_score')->from('userScoreQuiz')->where('id', $quiz)->get();
    return $query->row()->average_score;
}

您的看法

$data['quiz']          = //fill this area
$data['average_score'] = $this->quiz->getAverage($quizid);
$data['score']         = //fill this area

$this->load->view('resultview', $data);

它们将可以作为$quiz, $average_score, $score

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