php使用PDO，并连接SQL

try {

//$dbh = new PDO ($dsn,$username,$pwd);
$dbh = new PDO('sqlsrv:Server=127.0.0.1,1433;Database=SQLtest',"sa", "zhengfeng79");
foreach( $dbh -> query ( 'SELECT * from [user]' ) as  $row ) {
print_r ( $row );
}
$dbh  =  null ;
} catch ( PDOException $e ) {
print  "Error!: "  .  $e -> getMessage () .  "<br/>" ;
die();
}