Is this php/mysql expression (which sets the timezone of connection) safe enough?

Question

Is this expression is safe or does this approach has vulnerabilities?

$pdo = new PDO('mysql:host=localhost;dbname=test', 'user', 'password');
$pdo->exec('SET time_zone = "' . date_default_timezone_get() . '"');

Answer 1

I would check first if date_default_timezone_get() returns a valid value, to avoid a query like: SET time_zone = "".