abstract：$dsn="mysql:host=localhost;dbname=php_edu;charset=utf8;";$root='root';$password='123456';try { $pdo=new PDO($dsn,$root,$password);} catch (PDOException $e) {//捕获异常信息，并退出程序 ex
$dsn="mysql:host=localhost;dbname=php_edu;charset=utf8;";
$root='root';
$password='123456';
try {
$pdo=new PDO($dsn,$root,$password);
} catch (PDOException $e) {
//捕获异常信息，并退出程序
exit($e->getMessage());
}