你如何将数组与许多元素比较到PHP中的数据库？

Posted 2021-03-27

我已经建立了一个在线考试门户网站，其中用户选择的不同无线电选项存储在一个数组中，然后我将该数组发送到一个php文件中以检查数据库，这就是我面临的问题。答案在数据库中，在我获取它们之后我将它们与数组进行比较，但它没有得到解决。请帮忙 。

这是答案来自的表格问题： -

qid     questions       opa    opb    opc   opd   ans
1      what is that?    car    dog   john   star   4
2   .  what is that?    car    dog   john   star   4
3      what is that?    car    dog   john   star   4
4      what is that?    car    dog   john   star   4
5      what is that?    car    dog   john   star   4
6      what is that?    car    dog   john   star   4

这是我发送它的javascript代码： -

function Checkanswers(){
        var Selected = document.querySelectorAll('[name="op"]:checked');
        if (Selected != null) {
        Selected.forEach(function(radio) {
        arr.push(radio.value);
        });

        }
        alert(JSON.stringify(arr));
        $.ajax({
            type: "POST",
            url:"check.php",
            data: {"myJSarray" : JSON.stringify(arr)},
            success: function(data)
            {
                alert(data);
            }
        });

    }

这是完成所有这些的PHP代码： -

<?php

session_start();
require 'includes/dbh.inc.php';

$array = array();

$arr =$_POST["myJSarray"];

$arr1=substr($arr,1,strlen($arr)-1);

$array=explode(',',$arr1);



$result = 0;
$i= 1;
$sql = " SELECT * FROM questionpaper ";
$query = mysqli_query($conn,$sql);
while($rows = mysqli_fetch_array($query)){

    $checked = ($rows['ans'] ==  (int)$array[$i]) ;

    if($checked){

        $result++;

    }
    $i++;

}

echo "<br> Your total score is".$result;

?>

错误：-

Notice: Undefined index: myarray in D:XAMPPhtdocsassignmentscheck.php on line 8

Notice: Undefined offset: 1 in D:XAMPPhtdocsassignmentscheck.php on line 20

Notice: Undefined offset: 2 in D:XAMPPhtdocsassignmentscheck.php on line 20

Notice: Undefined offset: 3 in D:XAMPPhtdocsassignmentscheck.php on line 20

Notice: Undefined offset: 4 in D:XAMPPhtdocsassignmentscheck.php on line 20

Notice: Undefined offset: 5 in D:XAMPPhtdocsassignmentscheck.php on line 20

Notice: Undefined offset: 6 in D:XAMPPhtdocsassignmentscheck.php on line 20

Notice: Undefined offset: 7 in D:XAMPPhtdocsassignmentscheck.php on line 20

Notice: Undefined offset: 8 in D:XAMPPhtdocsassignmentscheck.php on line 20

Notice: Undefined offset: 9 in D:XAMPPhtdocsassignmentscheck.php on line 20

Notice: Undefined offset: 10 in D:XAMPPhtdocsassignmentscheck.php on line 20

Notice: Undefined offset: 11 in D:XAMPPhtdocsassignmentscheck.php on line 20

Notice: Undefined offset: 12 in D:XAMPPhtdocsassignmentscheck.php on line 20

Notice: Undefined offset: 13 in D:XAMPPhtdocsassignmentscheck.php on line 20

Notice: Undefined offset: 14 in D:XAMPPhtdocsassignmentscheck.php on line 20

Notice: Undefined offset: 15 in D:XAMPPhtdocsassignmentscheck.php on line 20

Your total score is0

答案

改变这一点

var arr = [];
 var Selected = document.querySelector('[name="op"]:checked');
 if (Selected!= null) {
 arr.push(Selected.value);
 } 
console.log(arr);

将php更改为此我假设答案与您在阵列中发送的顺序相同。

   $count = 0;
   $sql = " SELECT * FROM questionpaper ";
   $query = mysqli_query($conn,$sql);
   $i=0;
   while($row=mysqli_fetch_array($query)){
   if ($array1[$i]==$row['answer']) {
    $count++;
    $i++;

    }
   echo $count;

如果你能展示数据库结构是多么容易，你会很容易给出确切的答案。