PHP链接mysql数据库的类 基础水平别吐槽!0-0!

<?php
header('Content-Type: text/html; charset=utf-8');
class mysql {
       //定义属性
	private $host = '';
	private $user = '';
	private $password = '';
	private $tables = '';
	private $coding = '';
       //构造方法
	function __construct($host,$user,$password,$tables,$coding){
		$this->host=$host;
		$this->user=$user;
		$this->password=$password;
		$this->tables=$tables;
		$this->coding=$coding;
		$this->connect();
	}
       //链接MySQL方法
	function connect($host,$user,$password,$tables,$coding){
		$conn = mysql_connect($host,$user,$password) or die("连接服务器错误");
	mysql_select_db($tables,$conn) or die(mysql_error());
    mysql_set_charset($coding);
		
	}
    //简化函数mysql_query为query
	function query($v){
	   return mysql_query($v);
   }
	function fetch_array($a){
		return mysql_fetch_array($a);
   }

}
$db = new mysql(localhost,root,"",table,utf8);
?>