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无法在Codeigniter PHP中获取数据

php mysql database codeigniter

无法在Codeigniter PHP中获取数据,php,mysql,database,codeigniter,Php,Mysql,Database,Codeigniter,在Codeigniter PHP中开发测验，无法获取其显示为这样的数据，每个显示为这样的问题的字段名为“quizID”，“question” “quizID”？>。“问题”？> 测验模型文件代码 <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); class quizmodel extends CI_Model { public function getQuestions() {

在Codeigniter PHP中开发测验，无法获取其显示为这样的数据，每个显示为这样的问题的字段名为“quizID”，“question”

“quizID”？>。“问题”？>

测验模型文件代码

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class quizmodel extends CI_Model {

public function getQuestions()
{
    $this->db->select("quizID, question, choice1, choice2, choice3, 
answer");
    $this->db->from("QuizQuestion");

    $query = $this->db->get();

    return $query->result();

    $num_data_returned = $query->num_rows;

    if ($num_data_returned < 1) {
      echo "There is no data in the database";
      exit();   
    }
}
}

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Questions extends CI_Controller {

function __construct() {
    parent::__construct();
    $this->load->database();
}

public function quizdisplay()
{
    $this->load->model('quizmodel');
    $this->data['questions'] = $this->quizmodel->getQuestions();
    $this->load->view('play_quiz', $this->data);
 }

    public function resultdisplay()
 {
    $this->data['checks'] = array(
         'ques1' => $this->input->post('quizid1'),
         'ques2' => $this->input->post('quizid2'),
         'ques3' => $this->input->post('quizid3'),
         'ques4' => $this->input->post('quizid4'),
         'ques5' => $this->input->post('quizid5'),
         'ques6' => $this->input->post('quizid6'),
         'ques7' => $this->input->post('quizid7'),
         'ques8' => $this->input->post('quizid8'),
         'ques9' => $this->input->post('quizid9'),
         'ques10' => $this->input->post('quizid10'),
    );

    $this->load->model('quizmodel');
    $this->data['results'] = $this->quizmodel->getQuestions();
    $this->load->view('result_display', $this->data);
}
}

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Play Quiz</title>

</head>
<body>

<div id="container">
<h1>Play the Quiz!</h1>

<form method="post" action="<?php echo base_url();?
>index.php/Questions/resultdisplay">


<?php foreach($questions as $row) { ?>

<?php $ans_array = array($row->choice1, $row->choice2, $row->choice3, $row-
>answer);
shuffle($ans_array); ?>

<p><?=$row->quizID?>.<?=$row->question?></p>

<input type="radio" name="quizid<?=$row->quizID?>" value="<?=$ans_array[0]?
>" required> <?=$ans_array[0]?><br>
<input type="radio" name="quizid<?=$row->quizID?>" value="<?=$ans_array[1]?
>"> <?=$ans_array[1]?><br>
<input type="radio" name="quizid<?=$row->quizID?>" value="<?=$ans_array[2]?
>"> <?=$ans_array[2]?><br>
<input type="radio" name="quizid<?=$row->quizID?>" value="<?=$ans_array[3]?
>"> <?=$ans_array[3]?><br>

<?php } ?>

<br><br>
<input type="submit" value="Submit!">

</form>

</div>

</body>
</html>





控制器有一个错误：

而不是
$this->data['questions']=$this->quizmodel->getQuestions（）

它应该说
data['questions']=$this->quizmodel->getQuestions（）

这同样适用于：
$this->data['results']=$this->quizmodel->getQuestions（）

应该是：data['results']=
$this->quizmodel->getQuestions（）


$this
是一个singleton Codeigniter实例，请阅读更多：

模型也有一个错误，类声明必须是大写，请阅读更多

您可能还注意到，在模型中，
return$query->result（）之后剩余的代码无法访问，您可能希望将其更改为：


$num_data_returned = $query->num_rows();

if ($num_data_returned < 1) {
  echo "There is no data in the database";
  exit();   
}else{
   return $query->result();
}



$num_data_returned=$query->num_rows（）；
如果（$num\u data\u返回值<1）{
echo“数据库中没有数据”；
退出（）；
}否则{
返回$query->result（）；
}

像这样更改您的型号，然后再试一次


class quizmodel extends CI_Model {

    public function getQuestions()
    {
        $this->db->select("quizID, question, choice1, choice2, choice3, 
    answer");
        $this->db->from("QuizQuestion");

        $query = $this->db->get();

        $result = $query->result_array();

        $num_data = $query->num_rows();

         if ($num_data ==0) {
           return false;  
         }else{
           return $result;
         }
       }
    }



类quizmodel扩展了CI_模型{


public function getQuestions()
{
    $this->db->select("quizID, question, choice1, choice2, choice3, 
answer");
    $this->db->from("QuizQuestion");

    $num_data =  $this->db->get()->num_rows();

     if ($num_data == 0) {
       return false;  
     }else{
       return true;
     }
   }
}



显示错误无法修改标题信息数据['questions']=$this->quizmodel->getQuestions（）；在此行中并分析错误：语法错误，意外请参见我的编辑：类名的第一个字母必须大写，其余部分必须小写。请确保您的类扩展了基本模型类。立即在此文件上显示错误

public function getQuestions()
{
    $this->db->select("quizID, question, choice1, choice2, choice3, 
answer");
    $this->db->from("QuizQuestion");

    $num_data =  $this->db->get()->num_rows();

     if ($num_data == 0) {
       return false;  
     }else{
       return true;
     }
   }
}