How to Efficiently Insert Multiple Checkbox and Textbox Array Values into a MySQL Database Using PHP?

Inserting Array Data into MySQL Database

In PHP, inserting multiple checkbox and textbox array values into a MySQL database can be challenging. Here are some encountered problems and their solutions:

Checkbox Selection Misalignment

The issue with displaying all checkbox values, even unmarked ones, stems from incorrect array handling. To overcome this, index the checkbox names explicitly. For example:

<input type="checkbox" name="checkbox[0]" value="17">

This ensures a direct correspondence between checkbox indexes and the corresponding item and quantity values.

Missing Database Insertion

Despite establishing a database connection, there seems to be a problem with actual data insertion. The incorrect use of MySQL functions is identified as the culprit.

MySQLi and MySQL APIs should not be intermixed. Instead of using mysql_query, use the appropriate $conn->query() method for database operations.

Code Example

$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();
}

Additional Considerations

• Store prices in the database instead of HTML to prevent potential manipulation.
• Use prepared statements to safeguard against SQL injection.
• If you happen to use MySQLi, replace $conn->query() with mysqli_query($conn, $query);.

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