What are common pitfalls when passing checkbox values to a database in PHP?

One common pitfall when passing checkbox values to a database in PHP is not properly handling unchecked checkboxes, as their values may not be sent in the form submission. To solve this, you can check if the checkbox value is set using the isset() function before inserting it into the database. Another pitfall is not sanitizing the input data, leaving the application vulnerable to SQL injection attacks. To prevent this, always use prepared statements or sanitize input data before executing SQL queries.

// Example code snippet to handle checkbox values when inserting into a database

// Assuming 'checkbox' is the name attribute of the checkbox input field in the form
$checkboxValue = isset($_POST['checkbox']) ? 1 : 0;

// Sanitize input data before using in SQL query
$checkboxValue = mysqli_real_escape_string($connection, $checkboxValue);

// Insert checkbox value into the database
$query = "INSERT INTO table_name (checkbox_column) VALUES ('$checkboxValue')";
mysqli_query($connection, $query);