Question

When being saved to database, it iterates like this foreach（$ ac）根据点击的复选框继续迭代，有人可以帮助我，这是我的项目。我认为我对foreach的逻辑有些错误，但我不知道它的确切位置。请调试这个人。：））））））））））））））））））））））））））））））

 <html>

<body>
    <div class="image">
            <img src="PLM1.png" alt="plmbackground" height="650" width="1351"/>
            </div><br><br><br><br>  
    <form method = "post" class="content">
    <font size= '5px'>Student ID <input type="text" name = "student_id"> <br>
        OR NO <input type = "text" name = "or_no"> <br>
        </font>
        <table align="center">
        <tr valign="middle" align="center">
            <td><font color="red"><b>REQUESTS</b></font>
            <td><font color="red"><b>QUANTITY</b></font>   
        </tr>
        <tr>
            <td><input type = "checkbox"name = "ac_description[]" value = "Replacement_of_Registration"><b>Replacement of Registration</b>
            <td><center><input type="number" name="quantity[]" style="width:60px;"></center>
        </tr>
            <tr>
            <td><input type = "checkbox"name = "ac_description[]" value = "Good Moral Certificate"><b>Good Moral Certificate</b>
            <td><center><input type="number" name="quantity[]" style="width:60px;"></center>
        </tr>
        </tr>
            <tr>
            <td><input type = "checkbox" name = "ac_description[]" value = "Honorable Dismissal "><b>Honorable Dismissal</b>
            <td><center><input type="number" name="quantity[]" style="width:60px;"></center>
        </tr>
        </tr>
            <tr>
            <td><input type = "checkbox" name = "ac_description[]" value = "Transcript of Record"><b>Transcript of Record</b>
            <td><center><input type="number" name="quantity[]" style="width:60px;"></center>
        </tr>
        <tr>
            <td><input type = "checkbox" name = "ac_description[]" value = "Diploma"><b>Diploma</b>
            <td><center><input type="number" name="quantity[]" style="width:60px;"></center>
        </tr>
        <tr>
            <td><input type = "checkbox" name = "ac_description[]" value = "CUE Request"><b>CUE Request</b>
            <td><center><input type="number" name="quantity[]" style="width:60px;"></center>
        </tr>
        <tr>
            <td><input type = "checkbox" name = "ac_description[]" value = "CMI Request"><b>CMI Request</b>
            <td><center><input type="number" name="quantity[]" style="width:60px;"></center>
        </tr>
        <tr>
            <td><input type = "checkbox"  name = "ac_description[]" value = "Entrance Exam"><b>Entrance Exam</b>
            <td><center><input type="number" name="quantity[]" style="width:60px;"></center>
        </tr>
        <tr>
            <td><input type = "checkbox" name = "ac_description[]" value = "School fees-Medical/Dental Laboratory "><b>School fees-Medical/Dental Laboratory</b>
            <td><center><input type="number" name="quantity[]" style="width:60px;"></center>
        </tr>
        <tr>
            <td><input type = "checkbox" name = "ac_description[]" value = "School fees-Transcript/Honorable"><b>School fees-Transcript/Honorable</b>
            <td><center><input type="number" name="quantity[]" style="width:60px;"></center>
        </tr>
        <tr>
            <td><input type = "checkbox" name = "ac_description[]" value = "School fees-Library"><b>School fees-Library</b>
            <td><center><input type="number" name="quantity[]" style="width:60px;"></center>
        </tr>
        <tr>
            <td><input type = "checkbox" name = "ac_description[]" value = "Affiliation Fees"><b>Affiliation Fees</b>
            <td><center><input type="number" name="quantity[]" style="width:60px;"></center>
        </tr>
    </table>
    <br>

        <input type = "submit" name = "send" value = "Add" class="btn-5" > 
    </form>


<?php
//the database connection
$db = mysqli_connect ("localhost", "root", "turtledove", "accounting");

        if (!$db)
        {
            die ("ERROR!!!!!!>>>");
        }
        $student_id = $_POST["student_id"];
        $or_no = $_POST["or_no"];


        $status1="processing";
        $qty=1;
        $col_credit = 80;
        $dep_credit = 80;
        $col_debit = 0;
        $dep_debit = 0;
        $quantity = $_POST["quantity"];
        $ac_description = $_POST["ac_description"];
        if (($quantity)&&($ac_description)  )
        {
                foreach ($quantity as $quantity)
                { 
                foreach ($ac_description as $ac)
                {
                mysqli_query($db, "insert into or_header (or_no, ac_description, student_id, date1, status1, qty, 
                col_credit, col_debit, dep_credit, dep_debit)
                values (".$or_no.",'".mysqli_real_escape_string($db,$ac)."',
'".$student_id."',curdate(),'processing',".$quantity.",80,0,80,0)");
                }
                }


        }

?>
<form action="cashiermainpage.php">
            <input type="submit" method="POST" value="Mainpage" class="mainpage" alt="Submit">
            </form>
</body>
</html>

Answer 1

您的问题是由嵌套的foreach循环引起的。因为quantity和ac_description是两个数组，所以嵌套循环会为您提供每个组合，这意味着同一个项目会多次出现。

例如：if $a = [1,2]和$b = [3,4]，嵌套循环会给你

foreach($a as $first){
  foreach($b as $second){
    echo "$first, $second"; // 1,3  1,4  2,3   2,4
  }
}

你应该做的是有一个循环从两个数组中选取相应的术语

for($i=0, $limit=count($a); $i < $limit; $i++){
  echo $a[$i] . ', ' . $b[$i]; // 1,3   2,4
}

因此，为了回到你的问题，你可以通过以下方式解决问题：

for($i=0, $limit=count($quantity); $i < $limit; $i++){
  $qty = $quantity[$i];
  $ac = $ac_description[$i];

  // now you can run your query with the $qty and its matching $ac
}

注1：虽然这会有效，但请注意，您应该始终避免在循环中进行数据库查询，因为它们会大大减慢脚本速度。相反，请学习如何做multiple inserts in one query。

注2：您的代码非常容易受到SQL注入攻击，这意味着某人可以轻松修改，窃取，删除等数据库。了解prepared statements。

foreach根据点击的复选框数继续迭代

1 个答案: