How can the PDO error mode be enabled to troubleshoot registration form issues in PHP?

To troubleshoot registration form issues in PHP, the PDO error mode can be enabled to catch any exceptions thrown by the database queries. This can help identify any errors in the SQL statements or database connections that may be causing issues with the registration process.

// Enable PDO error mode
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);