为什么我无法通过PHP脚本将值插入子表中？

Question

I am new to PHP and MySQL. I simply want to register users to my site ( which I did successfully ) and once they login, they can donate clothes. I have two tables-

---

Users-

• id (int) PRIMARY KEY and AUTO INCREMENT.
• Name (varchar)
• E-mail (varchar)
• Password (varchar)

---

Clothes-

• id (int) PRIMARY KEY and AUTO INCREMENT.
• user_id (int) FOREIGN KEY
• Decription (varchar)
• Image (varchar)

---

What I want is that, when the user logs in and clicks on the donate button, it will take the user to this page-

Fill The Clothes Details

    <form action="clothes.php" method="post" enctype="multipart/form-data">
        <table align="center" width="760px" border="2">

            <td>Clothes Details</td>
            <td><textarea cols="60" rows="10" name="description" ></textarea></td>
            </tr>
            <tr>
                <td>Image</td>
                <td><input type="file" name="image" /></td>
            </tr>
            <tr>
                <td><input type="submit" name="register" value="Submit" ></td>
            </tr>
        </table>
    </form>
</body>
</html>

---

When the user enters the description and uploads the image, I want it to be stored in my PhpMyAdmin table, but with the respective id of the user. Here is my PHP script-

<?php
session_start();
include ("includes/db.php");
if (isset($_POST['register'])) {

    $description = $_POST['description'];
    $image = $_FILES['image']['name'];
    $temp = $_FILES['image']['tmp_name'];
    move_uploaded_file($temp, "clothes/$image");
    $insert = "insert into clothes (description, image) values ( '$description', '$image')";
    $run = mysqli_query($con, $insert);
    if ($run) {
        echo "<script>alert('Clothes Successfully Donated')</script>";
    }
}

?>

And as obvious it may seem, the data is not inserted into the table. When I echo the insert query, I am getting the query insert into clothes (user_id, description, image) values ( 'Jeans', 'HUMBLE. - Single.jpg') , which means my query is working. But I just cannot figure out what the problem is as this is my first experience with foreign keys. What am I doing wrong?

Answer 1

first of all, you need to correct the code.

<?php
session_start();
include ("includes/db.php");
if (isset($_POST['register'])) {
    $user_id = $_SESSION['user_id'];
    $description = $_POST['description'];
    $image = $_FILES['image']['name'];
    $temp = $_FILES['image']['tmp_name'];
    move_uploaded_file($temp, "clothes/$image");
    $insert = "insert into clothes (user_id, description, image) values ( $user_id, '$description', '$image')";
    $run = mysqli_query($con, $insert);
    if ($run) {
        echo "<script>alert('Clothes Successfully Donated')</script>";
    }
}
?>

First you need to verify, whether you have set the logged in user's id in session, If not then set first then this code will work fine. If you have not set then please set $_SESSION['user_id']=[id of loggedin user].

Hope this will help you.