How to Insert Multiple Checkbox and Textbox Arrays into a MySQL Database in PHP?

Inserting Multiple Checkbox and Textbox Arrays into MySQL Database in PHP

Inserting Multiple Checkbox Arrays

If checkbox values are not getting inserted into the database, there could be a discrepancy between the indexes of the name attribute in our HTML and the PHP array elements. To resolve this, we need to explicitly set unique indexes for each checkbox element:

<code class="html"><input tabindex="1" name="checkbox[0]" type="checkbox" value="17" />

<input tabindex="1" name="checkbox[1]" type="checkbox" value="20" /></code>

This will ensure that each checkbox has its own unique index in the $_POST['checkbox'] array.

Preventing Unchecked Checkboxes from Getting Inserted

To prevent unchecked checkboxes from being inserted into the database, we should explicitly check whether each checkbox was checked before inserting its value:

<code class="php">if(isset($_POST['checkbox'])) {
    foreach($_POST['checkbox'] as $check) {
        if(!empty($check)) {

            $check = implode(',', $_POST['checkbox']);
            $name = implode(',', $_POST['item']);
            $quantity = implode(',', $_POST['quantity']);
        }
    }</code>

Using the Prepared Statement Method for Insert Queries

Instead of using mysql_query, it's recommended to use prepared statements for insert queries to prevent SQL injection attacks. Here's how you can modify your insert method:

<code class="php">$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();
}</code>

Other Considerations

• It's good practice to retrieve prices from the database instead of hardcoding them in the HTML to prevent tampering.
• Avoid mixing MySQLi and mysql APIs for database connection and query execution.

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