通常是用mysql还是mysqli

	$mysqli=new mysqli("localhost","root","123456","test");
	if($mysqli->connect_error){
		die("连接失败".$mysqli->conect_error);
	}

	$sql="select * from user1";
	$res=$mysqli->query($sql);

	while($row=$res->fetch_row()){
		foreach($row as $k=>$v){
			echo "--$v";
		}
		echo "
";
	}

	$res->free();
	$mysqli->close();

$mysqli=mysqli_connect("localhost","root","123456","test");

	if(!$mysqli){
		die("连接失败".mysqli_connect_error($mysqli));
	}

	$sql="select * from user1";
	$res=mysqli_query($mysqli,$sql);

	while($row=mysqli_fetch_row($res)){
		foreach($row as $k=>$v){
			echo "--$v";
		}
		echo "
";
	}

	mysqli_free_result($res);
	mysqli_close($mysqli);