Question

问题

所以我的问题是我有一些PHP代码进入数据库并获取学生数据。然后程序将学生信息输出到屏幕上。信息放在input内，因为用户可以编辑信息。当用户编辑信息并单击Update时，我需要在数据库上更新信息。我的问题是我不知道如何遍历所有输入。

PHP代码 - 当用户点击Update

时

foreach ($_POST as $data) {
    echo $data . "<br>";
}

PHP代码 - 允许用户编辑

<form action="server/edit/students.php" method="post">

                    <table>
                        <tr>
                            <th>Student ID</th>
                            <th>Firstname</th>
                            <th>Lastname</th>
                            <th>Teacher's Firstname</th>
                            <th>Teacher's Lastname</th>
                        </tr>

                        <?php

                            // get student info
                            $getStudent = $link->prepare("SELECT * FROM students");
                            $getStudent->execute();
                            $getStudent = $getStudent->fetchAll(PDO::FETCH_ASSOC);

                            foreach ($getStudent as $student) {
                                $studentID = $student['studentID'];
                                $firstname = $student['firstname'];
                                $lastname = $student['lastname'];
                                $teacherID = $student['teacherID'];
                                $getTeacher = $link->prepare("SELECT * FROM teachers
                                                            WHERE teacherID = :teacherID");

                                $getTeacher->execute(array(
                                    "teacherID" => $teacherID
                                ));

                                $getTeacher = $getTeacher->fetchAll();

                                foreach ($getTeacher as $teacher) {
                                    $teacherFirstname = $teacher['firstname'];
                                    $teacherLastname = $teacher['lastname'];

                                    echo "
                                        <tr>
                                            <td><input type='text' value='$studentID'></td>
                                            <td><input type='text' value='$firstname'></td>
                                            <td><input type='text' value='$lastname'></td>
                                            <td><input type='text' value='$teacherFirstname'></td>
                                            <td><input type='text' value='$teacherLastname'></td>
                                        </tr>
                                    ";
                                }

                            }

                         ?>
                    </table>

                    <button type="submit" name="update">Update</button>

                </form>

Answer 1

所以，我所做的是我使用一个变量来跟踪数据的行。

代码

<?php

                            // get student info
                            $getStudent = $link->prepare("SELECT * FROM students ORDER BY studentID");
                            $getStudent->execute();
                            $getStudent = $getStudent->fetchAll(PDO::FETCH_ASSOC);

                            $value = 0; // counts rows

                            // loop through each student
                            foreach ($getStudent as $student) {
                                $studentID = $student['studentID'];
                                $firstname = $student['firstname'];
                                $lastname = $student['lastname'];
                                $teacherID = $student['teacherID'];

                                // get teacher
                                $getTeacher = $link->prepare("SELECT * FROM teachers
                                                            WHERE teacherID = :teacherID");

                                $getTeacher->execute(array(
                                    "teacherID" => $teacherID
                                ));

                                $getTeacher = $getTeacher->fetchAll();

                                // loop through each teacher
                                foreach ($getTeacher as $teacher) {
                                    $teacherFirstname = $teacher['firstname'];
                                    $teacherLastname = $teacher['lastname'];

                                    // output data
                                    echo "
                                        <tr>
                                            <td><input type='text' name='studentID-$value' value='$studentID'></td>
                                            <td><input type='text' name='firstname-$value' value='$firstname'></td>
                                            <td><input type='text' name='lastname-$value' value='$lastname'></td>
                                            <td><input type='text' name='teacherFirst-$value' value='$teacherFirstname'></td>
                                            <td><input type='text' name='teacherLast-$value' value='$teacherLastname'></td>
                                        </tr>
                                    ";
                                }

                                // add to row
                                $value += 1;

                            }

                         ?>

遍历所有输入值

1 个答案: