在php中获取 数据库的内容，返回到页面

<?php
   header("content-type:text/html;charset=utf-8");
   $link=mysqli_connect("localhost","root","root","d5");
   mysqli_set_charset($link,"utf8");
   $query="select * from one";
   $p=mysqli_query($link,$query);
   print_r(json_encode(mysqli_fetch_all($p)));
   mysqli_close($link);
?>