php连接mysql

<?php
function test(){
          $link=mysql_connect("localhost","root","");
mysql_select_db("test");
if(!$link) echo "连接失败<br>";
else echo "连接成功<br>";
$query="select name from persion";
$res=mysql_query($query,$link);
$err=mysql_error();
if($err){ echo "查询数据发生错误<br>";
}else{
$row=mysql_fetch_row($res);
echo "你查询的结果为:$row[0]";
}
mysql_close();
}
test();
?>