php面向对象都包括什么东西啊????我学了好久的面向对象了都搞不清楚

就仅仅是php脚本这部分？包不包括html代码部分啊？求高手帮我回答下。。。

与html无关
面向对象简单的讲就中把常用的代码封闭为class，方便使用。
以数据库连接为例：
平时你应是这样做的
<?php
$conn = @mysql_connect('192.168.1.180', 'admin', '123456') or die('连接失败');
mysql_select_db('ecshop', $conn);
$query = mysql_query("SELECT * FROM ecs_admin_user");
while ($row = mysql_fetch_assoc($query)) {
echo $row['user_name'];
}

//以上代码属面向过程，现在可以用面向对象方式实现
//以下是面向对象实现
class DB {

private $conn;
public $dbhost = '127.0.0.1'; //对象属性,默认主机地址
public $dbuser = 'root'; //对象属性,默认数据库用户名
public $dbpass = ''; //对象属性,默认密码
public $dbname = ''; //对象属性,数据库名

public function __construct($dbhost = '', $dbuser = '', $dbpass = '', $dbname = '') {
$this->dbhost = !empty($dbhost) ? $dbhost : $this->dbhost;
$this->dbuser = !empty($dbuser) ? $dbuser : $this->dbuser;
$this->dbpass = !empty($dbpass) ? $dbpass : $this->dbpass;
$this->dbname = !empty($dbname) ? $dbname : $this->dbname;
}

//对象方法，连接
public function connect() {
$this->conn = @mysql_connect($this->dbhost, $this->dbuser, $this->dbpass) or die('连接失败');
mysql_select_db($this->dbname, $this->conn);
}

//对象方法，询查方法，查询并返回数组结果
public function query($sql) {
$query = mysql_query($sql);
$data = array();
while ($row = mysql_fetch_assoc($query)) {
$data[] = $row;
}
return $data;
}

//对象方法，关闭连接
public function close() {
mysql_close($this->conn);
}

}

//这就中一个简单的数据连接和查询类，你可以保存到一php文件，以后引入它就用可以用了，下面实例化
//实例1
$db = new DB('192.168.1.180', 'admin', '123456', 'ecshop');
$db->connect();
$result = $db->query("SELECT * FROM ecs_admin_user");
foreach ($result as $rs) {
echo $rs['user_name'], '<br>';
}
//实例2
$db = new DB();
$db->dbhost = '192.168.1.180';
$db->dbuser = 'admin';
$db->dbpass = '123456';
$db->dbname = 'ecshop';
$result = $db->query("SELECT * FROM ecs_admin_user");
foreach ($result as $rs) {
echo $rs['user_name'], '<br>';
}

//实例3
$db = new DB('192.168.1.180', 'admin', '123456', 'ecshop');
$db->connect();
$result = $db->query("SELECT * FROM ecs_admin_user");
foreach ($result as $rs) {
echo $rs['user_name'], '<br>';
}
$db->close();
//切换数据连接
$db->dbname = 'wordpress';
$db->connect();
$result = $db->query("SELECT * FROM wp_users");
foreach ($result as $rs) {
echo $rs['user_login'], '<br>';
}
?>

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