比较两个数组以找到评估结果

Question

我想比较以下两个数组：

Array
(
    [0] => stdClass Object
        (
            [question_id] => 1
            [answer_id] => 21
        )

    [1] => stdClass Object
        (
            [question_id] => 3
            [answer_id] => 33
        )

    [2] => stdClass Object
        (
            [question_id] => 3
            [answer_id] => 36
        )

    [3] => stdClass Object
        (
            [question_id] => 3
            [answer_id] => 38
        )

    [4] => stdClass Object
        (
            [question_id] => 6
            [answer_id] => 49
        )

)
Array
(
    [0] => stdClass Object
        (
            [question_id] => 3
            [answer_id] => 38
        )

    [1] => stdClass Object
        (
            [question_id] => 3
            [answer_id] => 37
        )

    [2] => stdClass Object
        (
            [question_id] => 3
            [answer_id] => 33
        )

    [3] => stdClass Object
        (
            [question_id] => 1
            [answer_id] => 22
        )

    [4] => stdClass Object
        (
            [question_id] => 6
            [answer_id] => 49
        )

)

一个数组是评估的正确答案，另一个是用户输入的内容。

我如何将这两个数组与另一个显示 question_id 以及布尔值的产品进行比较，以确定它们是否正确？

我目前遇到以下问题：

• 有些问题有多个答案。
• question_id 顺序不一样，正确的顺序是第二个数组，它并不总是按数字顺序。

Answer 1

这是一个我希望对你有用的解决方案。

首先，我从上面重新创建了您的对象：

class AnswerObject {
    public $question_id=0;
    public $answer_id=0;

    function __construct($q,$a){
        $this->question_id=$q;
        $this->answer_id=$a;
    }
}

$obj_student_vals = array(new AnswerObject(1,21), new AnswerObject(3,33), new AnswerObject(3,36), new AnswerObject(3,38), new AnswerObject(6,49));
$obj_answer_key   = array(new AnswerObject(1,22), new AnswerObject(3,33), new AnswerObject(3,37), new AnswerObject(3,38), new AnswerObject(6,49));

现在，我提供的解决方案如下，并继续上面的代码：

$flat_student_vals = array();
$flat_answer_key   = array();

// flatten student vals to multi-dimensional array
// e.g. array('3'=>array(33,36,38),'6'=>array(49),'1'=>array(21))
foreach($obj_student_vals as $obj){
    if(!array_key_exists($obj->question_id,$flat_student_vals))
        $flat_student_vals[$obj->question_id]=array();
    $flat_student_vals[$obj->question_id][]=$obj->answer_id;
}

// flatten answer key to multi-dimensional array
// e.g. array('1'=>array(22),'3'=>array(33,37,38),'6'=>array(49))
foreach($obj_answer_key as $obj){
    if(!array_key_exists($obj->question_id,$flat_answer_key))
        $flat_answer_key[$obj->question_id]=array();
    $flat_answer_key[$obj->question_id][]=$obj->answer_id;
}

// the results for this student
$student_results = array();

// when we compare arrays between student vals and answer key,
// the order doesn't matter.  the array operator `==` is only concerned
// with equality (same keys/value pairs), not identity (in same order and of same type)
foreach($flat_student_vals as $qid=>$vals){
    $student_results[$qid]=($vals == $flat_answer_key[$qid]);
}

print_r($student_results);

我的代码中的 cmets 是不言自明的。最重要的是，为了有效地比较学生对答案键的回答，您需要将两个原始对象数组扁平化为简单的多维数组。