Question

问题

我有这个表单，管理员可以输入领导者的ID和最多6个学生ID。当管理员点击提交按钮时，我的PHP文件应验证输入中的信息，然后输入领导者的ID和数据库中的学生ID。但是当我测试程序时，程序会为学生ID插入NULL。

小组表（从空白开始）

id | leaderID | studentID

PHP代码

<?php 

require '../connect.php';

$leaderID = $_POST['leader-id'];
$students = array(
    $_POST['student-id-1'],
    $_POST['student-id-2'],
    $_POST['student-id-3'],
    $_POST['student-id-4'],
    $_POST['student-id-5'],
    $_POST['student-id-6'],
);

$studentSave = array();

// check if inputs are not empty
if(!empty($leaderID)) {

    // loop through all students
    foreach ($students as $student) {

        // check if student is not empty
        if(!empty($student)) {
            // add student to new array
            array_push($studentSave, $student);
        }

    }

    // loop through all students
    foreach ($studentSave as $student) {
        // check if students exist
        $getStudent = $link->prepare("SELECT * FROM students
                                    WHERE studentID = ':student'");
        $getStudent->execute(array(
            "student" => $student
        ));
        $getStudent->fetch();

        // if student exist
        if($getStudent) {

            // insert them into the database
            $insert = $link->prepare("INSERT INTO teams (leaderID, studentID)
                                    VALUES (:leaderID, :studentID)");
            $insert->execute(array(
                "leaderID" => $leaderID,
                "studentID" => $studentID,
            ));

            if(!$insert) {
                header("Location: ../../admin.php?msg=Sorry, we ran into an error");
            } else {
                header("Location: ../../admin.php?msgSuccess=Success");
            }

        } else {

            header("Location: ../../admin.php?msg=A student doesn't exist");

        }
    }

} else if(empty($leaderID)){
    header("Location: ../../admin.php?msg=There must be a leader");
}
?>

HTML表单

<div class="add_team">
                <h1>Add Team</h1>

                <form action="server/add/add_team.php" method="post">
                    <input type="text" name="leader_id" placeholder="* Leader ID">
                    <input type="text" name="student_id_1" placeholder="Student ID">
                    <input type="text" name="student_id_2" placeholder="Student ID">
                    <input type="text" name="student_id_3" placeholder="Student ID">
                    <input type="text" name="student_id_4" placeholder="Student ID">
                    <input type="text" name="student_id_5" placeholder="Student ID">
                    <input type="text" name="student_id_6" placeholder="Student ID">

                    <center>
                        <button type="submit" name="Add"><i class="fa fa-plus-circle fa-lg" aria-hidden="true"></i>Add</button>
                    </center>
                </form>
            </div> <!-- END OF .ADD_TEAM -->

所以我的程序循环遍历所有输入值并检查是否有任何输入不为空。然后程序将非空输入的值存储到新数组中。程序检查数据库中是否已存在值，最后将数据查询到数据库中。

Answer 1

我的问题是变量$studentID未定义，所以我应该使用$student

<强>代码

// insert them into the database
            $insert = $link->prepare("INSERT INTO teams (leaderID, studentID)
                                    VALUES (:leaderID, :studentID)");
            $insert->execute(array(
                "leaderID" => $leaderID,
                "studentID" => $student,
            ));

查询为studentID插入NULL

1 个答案: