Php + mysql, object-oriented, query

Host $ host; $ this-& gt; root $ root; $ this-& gt; password $ password;} functionconnect () {@ mysql_connect ($ this-& gt; host, $ this-& gt; root, $ this-& gt; password); mysql_select_db ($ this-& gt; database); mysql_query (& quot; setnamesutf8 & quot ;);} functionc php

Class mysql {
Public $ host;
Public $ root;
Public $ password;
Public $ database;

    function __construct ($host,$root,$password){        $this->host     =$host;                                         $this->root     =$root;        $this->password =$password ;    }    function connect (){        @mysql_connect  ($this->host,$this->root,$this->password);        mysql_select_db ($this->database);        mysql_query     ("set names utf8");    }    function close(){        mysql_close();    }    function select(){        $result=mysql_query("select * from users");        print_r ($result);    }}    $link=new mysql("localhost","root","","stu_system");$link->connect();$link->select();$link->close();

?>
Starting from a few days ago, I wrote the object-oriented document and finally felt that I was still writing process-oriented documents. what happened ~~~
Finally, the webpage does not display information.
I am self-taught and have limited abilities ~~ Ask for advice ~~