How can I efficiently insert data from multiple checkbox and textbox arrays into a MySQL database while handling unchecked checkboxes and preventing data manipulation?

Inserting Multiple Checkbox and Textbox Arrays into MySQL Database

In this scenario, the primary goal is to efficiently insert data from multiple checkbox and textbox arrays into a MySQL database. To begin, let's address the specific challenges encountered in the presented code.

Misinterpretation of Checkbox Data

The first issue pertains to the display of checkbox data. The original code failed to indicate unchecked checkboxes, resulting in all checkbox options appearing as selected. This is due to the erroneous handling of the checkbox values.

Incomplete Data Insertion

The second issue is that the data was not being properly inserted into the database. Despite the successful connection to the database, no data was being written. This is caused by incorrect usage of array indexing and the improper utilization of the MySQLi and mysql_query APIs.

Code Modifications

To resolve these issues, we propose the following code modifications:

• Modify the HTML form to explicitly index checkbox names to match corresponding item and quantity values.
• Within the PHP script, use MySQLi's prepared statements for secure and efficient data insertion.
• Remove manual price values from the HTML and fetch them from the database during processing to prevent potential data manipulation.
• Ensure consistent use of MySQLi APIs throughout the code.

Updated HTML:

<form method="POST">

<input type="hidden" name="item[]" value="cupcake">
<input type="text" name="items" value="cupcake" readonly><br>
<b>Price :</b> <span name="price" value="3.00">.00</span><br>
Quantity: <input tabindex="1" name="quantity[]" min="0" max="5" type="number" class="quantity" value="1" /><br>
<input tabindex="1" name="checkbox[0]" type="checkbox" value="17" /><span>Add to Cart</span></label></div></div></td><br>

<input type="hidden" name="item[]" value="cake">
<input type="text" name="items" value="cake" readonly><br>
<b>Price :</b> <span name="price" value="20.00">.00</span><br>
Quantity: <input tabindex="1" name="quantity[]" min="0" max="5" type="number" class="quantity" value="1" /><br>
<input tabindex="1" name="checkbox[1]" type="checkbox" value="20" /><span>Add to Cart</span></label></div></div></td><br>

<input type="submit" name = "insertBT"><br>
</form>

Revised PHP Script:

if(isset($_POST['insertBT'])) {
    $conn = new mysqli ($servername, $username, $password, $db);
    if($conn->connect_error) {
        die ("Connection Failed : " . $conn->connect_error);
    } else {
        $stmt = $conn->prepare("INSERT INTO purchases (Product, Quantity, Price) VALUES (?, ?, ?)");
        $stmt->bind_param("sis", $name, $quantity, $price);
        foreach ($_POST['checkbox'] as $i => $price) {
            $name = $_POST['name'][$i];
            $quantity = $_POST['quantity'][$i];
            $stmt->execute();
        }
    }
}

By implementing these changes, the script should now correctly handle checkbox data, perform secure data insertion, fetch dynamic price values from the database, and provide accurate results. Remember, always verify that user input is properly sanitized before executing database operations to prevent potential security vulnerabilities.

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