What are some common pitfalls when transitioning from using MySQL functions to PDO in PHP?

One common pitfall when transitioning from using MySQL functions to PDO in PHP is not properly handling errors. With MySQL functions, errors were often displayed directly on the page, but with PDO, errors need to be explicitly caught and handled. To solve this, use try-catch blocks to catch any exceptions thrown by PDO.

try {
    $pdo = new PDO('mysql:host=localhost;dbname=my_database', 'username', 'password');
    // PDO query and fetch operations
} catch (PDOException $e) {
    echo "Connection failed: " . $e->getMessage();
}