php - 将html表单发送到php文件时出错

Question

我正在尝试制作一个 GPA 计算器，允许用户根据需要输入更多字段。我将所有字段命名为“grades[]”，将所有字段命名为“units[]”。当数据被提交时，php 文件扫描每个字段并将数据分别输入到名为 $GradeArray 和 $UnitsArray 的变量中，然后对这两个变量进行所需的所有计算。

我让计算器正常工作，但随后我测试了是否存在任何错误。当我跳过任何字段并将数据输入下一个字段时，结果为 0，或者只是一个错误的答案。

这是导致错误发生的原因的照片：

在此处输入图像描述

但是当我按顺序输入字段时，没有遗漏任何字段，答案就出来了。

我猜我的 foreach() 语句有问题。无论如何这里是代码......希望你能帮忙！

Jquery 动态添加额外的输入字段（我为可读性添加了空格）：

$('#add').click(function() {
$('<div>
    <select  name = "grades[]">
        <option value = "0"> SELECT </option>
        <option value = "A"> A</option>
        <option value = "AMINUS"> A- </option>
        <option value = "BPLUS"> B+ </option>
        <option value = "B"> B </option> 
        <option value = "BMINUS"> B- </option> 
        <option value = "CPLUS"> C+ </option>
        <option value = "C"> C </option> 
        <option value = "CMINUS"> C- </option> 
        <option value = "DPLUS"> D+ </option> 
        <option value ="D"> D </option> 
        <option value = "DMINUS"> D-</option>
        <option value = "F"> F </option> 
   </select> <input name = "units[]"  />
 </div>  ').fadeIn('slow').appendTo('.inputs');
i++;
});

的HTML：

<form method = "post" action = "process.php" name = "myform" id = "myform">
            <div class = "inputs">
                <select name = "grades[]">
                    <div><option value = "0"> SELECT </option></div>
                    <div><option value = "A" > A </option></div>
                    <div><option value = "AMINUS"> A-</option></div>
                    <div><option value = "BPLUS" > B+ </option></div>
                    <div><option value = "B"> B </option></div>
                    <div><option value = "BMINUS" > B- </option></div>
                    <div><option value = "CPLUS"> C+ </option></div>
                    <div><option value = "C" > C </option></div>
                    <div><option value = "CMINUS"> C- </option></div>
                    <div><option value = "DPLUS" > D+ </option></div>
                    <div><option value = "D"> D </option></div>
                    <div><option value = "DMINUS" > D- </option></div>
                    <div><option value = "F"> F </option> </div>
                </select>
                <input name = "units[]" type = "text"/>
                <br>
                <select name = "grades[]">
                    <div><option value = "0"> SELECT </option></div>
                    <div><option value = "A" > A </option></div>
                    <div><option value = "AMINUS"> A-</option></div>
                    <div><option value = "BPLUS" > B+ </option></div>
                    <div><option value = "B"> B </option></div>
                    <div><option value = "BMINUS" > B- </option></div>
                    <div><option value = "CPLUS"> C+ </option></div>
                    <div><option value = "C" > C </option></div>
                    <div><option value = "CMINUS"> C- </option></div>
                    <div><option value = "DPLUS" > D+ </option></div>
                    <div><option value = "D"> D </option></div>
                    <div><option value = "DMINUS" > D- </option></div>
                    <div><option value = "F"> F </option> </div>
                </select>
                <input name = "units[]" type = "text" />
                <br>
                <select name = "grades[]">
                    <div><option value = "0"> SELECT </option></div>
                    <div><option value = "A" > A </option></div>
                    <div><option value = "AMINUS"> A-</option></div>
                    <div><option value = "BPLUS" > B+ </option></div>
                    <div><option value = "B"> B </option></div>
                    <div><option value = "BMINUS" > B- </option></div>
                    <div><option value = "CPLUS"> C+ </option></div>
                    <div><option value = "C" > C </option></div>
                    <div><option value = "CMINUS"> C- </option></div>
                    <div><option value = "DPLUS" > D+ </option></div>
                    <div><option value = "D"> D </option></div>
                    <div><option value = "DMINUS" > D- </option></div>
                    <div><option value = "F"> F </option> </div>
                </select>
                <input name = "units[]" type = "text" />
                <br>
                <select name = "grades[]">
                    <div><option value = "0"> SELECT </option></div>
                    <div><option value = "A" > A </option></div>
                    <div><option value = "AMINUS"> A-</option></div>
                    <div><option value = "BPLUS" > B+ </option></div>
                    <div><option value = "B"> B </option></div>
                    <div><option value = "BMINUS" > B- </option></div>
                    <div><option value = "CPLUS"> C+ </option></div>
                    <div><option value = "C" > C </option></div>
                    <div><option value = "CMINUS"> C- </option></div>
                    <div><option value = "DPLUS" > D+ </option></div>
                    <div><option value = "D"> D </option></div>
                    <div><option value = "DMINUS" > D- </option></div>
                    <div><option value = "F"> F </option> </div>
                </select>
                <input name = "units[]" type = "text"/>

            </div>


                <input type = "submit" value = 'Submit' id = "Submit" style = "font-family:'HelveticaNeue-Light', 'Helvetica Neue Light', 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; width: 80px;background-color: #c5Da37; border: none; color: white;"/>
                <input type ="reset" style = "background-color: #0499ff; width: 90px; color: white;">
   </form>

PHP：

//ARRAYS
$GradeArray = array();
$UnitArray = array();
$GradePoints = array();


//INPUT GRADES (NUMERICAL) INTO GRADE ARRAY
foreach($_POST['grades'] as $grades)
{

    if ($grades == "A"){
        $GradeArray[] = 4.0;
    }
    else if ($grades == "AMINUS"){
        $GradeArray[] = 3.7;
    }
    else if ($grades == "BPLUS"){
        $GradeArray[] = 3.3;
    }
    else if ($grades == "B"){
        $GradeArray[] = 3.0;
    }
    else if ($grades == "BMINUS"){
        $GradeArray[] = 2.7;
    }
    else if ($grades == "CPLUS"){
        $GradeArray[] = 2.3;
    }
    else if ($grades == "C"){
        $GradeArray[] = 3.0;
    }
    else if ($grades == "CMINUS"){
        $GradeArray[] = 2.7;
    }
    else if ($grades == "DPLUS"){
        $GradeArray[] = 2.3;
    }
    else if ($grades == "D"){
        $GradeArray[] = 2.0;
    }
    else if ($grades == "DMINUS"){
        $GradeArray[] = 1.7;
    }
    else if ($grades == "F"){
        $GradeArray[] = 0;
    }
}

//INSERT VALUES FROM UNITS INTO UNITS ARRAY
foreach($_POST['units'] as $units)
{
    if ($units == NULL)
    {
        $UnitArray[] = 0;
    }

    $UnitArray[] = $units;
}

//CALCULATE GP
for ($i = 0; $i <= count($GradeArray); $i++)
{
    $GradePoints[$i] = $GradeArray[$i] * $UnitArray[$i];
}



//SUM UP GRADE POINTS
$sumGradePoints= 0; 
for($i = 0; $i != count($GradeArray); $i++)
{
    $currentItem = $GradePoints[$i];

    $sum = $sumGradePoints+$currentItem;

    $sumGradePoints = $sum;
}

//SUM UP CREDIT HOURS
$sumUnitPoints = 0;
for ($i = 0; $i <= count($UnitArray); $i++)
{
    $currentItem = $UnitArray[$i];

    $sum = $sumUnitPoints+$currentItem;

    $sumUnitPoints = $sum;
}

$result = $sumGradePoints/$sumUnitPoints;

echo $result;



?>

php - 将html表单发送到php文件时出错

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