使用一个关联数组中的值来测试另一个关联数组中的值

Question

我需要帮助，尝试了几天都没有成功，PHP 的新手所以请原谅我，我有一个下面的关联数组 return 来自数据库 table 评分系统，我想要实现的是尝试 "scores" 来自另一个关联数组，遍历评分系统，直到我找到一个分数介于评分系统中连续的值之间然后 return 字母等级和备注，请参阅下面的尝试，我已经筋疲力尽了，我们将不胜感激。 我试过的代码

while ($row = $grade->fetch(PDO::FETCH_ASSOC)) {
        $data = $row;
        var_export($data);
    } //fetches the grading system whose array is seen below

while($row = $stmt->fetch(PDO::FETCH_ASSOC)){
    $scores = $row;
    var_export($scores);
}// fetches scores of students in test
foreach($data as $key=> $grading) {
    foreach($scores as $key =>$values){


    if($values["marks"]>=$grading["grade_min"] && $values["marks"]<=$grading["grade_max"])
    print_r($values["marks"]);
    print_r($grading["grade"]);
    print_r($grading["remarks"]);
}
} Am trying to iterate each scores against the grading system but not successful, please help.

Array
(
    [0] => Array
        (
            [id] => 2
            [grade_min] => 1
            [grade_max] => 39
            [grade] => E
            [remarks] => Fail
        )

    [1] => Array
        (
            [id] => 3
            [grade_min] => 40
            [grade_max] => 49
            [grade] => D
            [remarks] => Pass
        )

    [2] => Array
        (
            [id] => 4
            [grade_min] => 50
            [grade_max] => 59
            [grade] => C
            [remarks] => Credit
        )

    [3] => Array
        (
            [id] => 5
            [grade_min] => 60
            [grade_max] => 69
            [grade] => B
            [remarks] => Good
        )

    [4] => Array
        (
            [id] => 6
            [grade_min] => 70
            [grade_max] => 79
            [grade] => A
            [remarks] => Very Good
        )

    [5] => Array
        (
            [id] => 7
            [grade_min] => 80
            [grade_max] => 100
            [grade] => A+
            [remarks] => Excellent
        )

)
Array
(
    [0] => Array
        (
            [id] => 2
            [grade_min] => 1
            [grade_max] => 39
            [grade] => E
            [remarks] => Fail
        )

    [1] => Array
        (
            [id] => 3
            [grade_min] => 40
            [grade_max] => 49
            [grade] => D
            [remarks] => Pass
        )

    [2] => Array
        (
            [id] => 4
            [grade_min] => 50
            [grade_max] => 59
            [grade] => C
            [remarks] => Credit
        )

    [3] => Array
        (
            [id] => 5
            [grade_min] => 60
            [grade_max] => 69
            [grade] => B
            [remarks] => Good
        )

    [4] => Array
        (
            [id] => 6
            [grade_min] => 70
            [grade_max] => 79
            [grade] => A
            [remarks] => Very Good
        )

    [5] => Array
        (
            [id] => 7
            [grade_min] => 80
            [grade_max] => 100
            [grade] => A+
            [remarks] => Excellent
        )

)

分数数组如下所示：

Array
(
    [0] => 35
    [1] => 48
    [2] => 57
    [3] => 78
    [4] => 75
    [5] => 89
)

我想针对评分系统数组迭代这些分数数组，return 只有 "grade" 和 "remarks" 匹配分数在 "grade_min" 和 "grade_max"

Answer 1

最好先遍历scores再遍历grading找到那个scores所属的那个。

另外，你的if没有大括号，所以只会执行后面的第一句。

// fetches the grading system whose array is seen below
while ($row = $grade->fetch(PDO::FETCH_ASSOC)) {
    $data = $row;
    // var_export($data); // No need to se this anymore
}

// fetches scores of students in test
while($row = $stmt->fetch(PDO::FETCH_ASSOC)){
    $scores = $row;
    // var_export($scores); // No need to see this anymore
}

// Iterate scores first (I don't know if you need the index or not)
foreach($scores as $scoreIndex => $score) {
    // Search grading for this score (Index not needed here, just values)
    foreach($data as $grading) {
        if($score['marks'] >= $grading['grade_min'] && $score['marks'] <= $grading['grade_max']) {
            // Score is inside this grading
            // Echo, print or assign what you need here

            // Then exit the loop for grading
            break;
        }
    }
}

根据 $scores 的输出，该数组只是单个值，没有关联数组，因此循环应该是：

// Iterate scores first (I don't know if you need the index or not)
foreach($scores as $scoreIndex => $score) {
    // Search grading for this score (Index not needed here, just values)
    foreach($data as $grading) {
        // $score is an integer, not an array
        if($score >= $grading['grade_min'] && $score <= $grading['grade_max']) {
            // Score is inside this grading
            // Echo here what you need

            // Then exit the loop for grading
            break;
        }
    }
}