How can the selected ID from a predefined field be retrieved for use in an INSERT INTO statement in PHP?

To retrieve the selected ID from a predefined field for use in an INSERT INTO statement in PHP, you can use the $_POST superglobal to access the value submitted via a form. You can then sanitize the input to prevent SQL injection attacks and use it in your SQL query.

// Retrieve the selected ID from a predefined field
$selected_id = $_POST['selected_id'];

// Sanitize the input to prevent SQL injection
$selected_id = filter_var($selected_id, FILTER_SANITIZE_NUMBER_INT);

// Use the selected ID in your INSERT INTO statement
$sql = "INSERT INTO your_table_name (selected_id) VALUES ('$selected_id')";