mysqlとphpのリンク

<?
$conn=@mysql_connect("localhost","root","123456")
if($conn)
echo"成功";
?>

<?
$conn=@mysql_connect("localhost","root","123456")or dir("链接错误");
?>

<?
$conn=@mysql_connect("localhost","root","123456")or die("链接错误");
mysql_select_db("new",$conn);
?>

<?
$conn=@mysql_connect("localhost","root","123456") or die("链接错误");
mysql_select_db("new",$conn);
$sql="INSERT INTO test (id,name)"values(‘4’,&#39;zhang&#39;);
mysql_query($sql,$conn);
?>

<?
$conn=@mysql_connect("localhost","root","123456") or die("链接错误");
mysql_select_db("new",$conn);
$sql="SELECT * FORM  ‘test’";
$stt = mysql_query ($sql,$conn);
$row=mysql_fetch_array($stt);
echo $row[name];
?>

<?
$conn=@mysql_connect("localhost","root","123456") or die("链接错误");
mysql_select_db("new",$conn);
$sql="SELECT * FORM  ‘test’";
$stt = mysql_query ($sql,$conn);
$row=mysql_fetch_array($stt);
while($row=mysql_fetch_array($stt));{
echo$row[name],"<dir>";               [name]可以是数组下标也可以是域名
}
?>