php 类的写法

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php 类的写法//Db.class.php
class Db {
    private $_dblink;
    public $result;
    public function __construct($host, $user, $password, $dbname, $charset = 'utf8') {
        try{
            if($this->_dblink = mysql_connect($host, $user, $password)) {
                if(mysql_select_db($dbname)) {
                    $this->query("SET NAMES " . $charset . " ;");
                } else {
                    throw new Exception(mysql_error());
                }
            } else {
                throw new Exception(mysql_error());
            }
        } catch (Exception $e) {
            die($e->getMessage());
        }
    }

    public function query($sql) {
        return $this->result = mysql_query($sql);
    }

    public function fetch() {
        return mysql_fetch_array($this->result);
    }

    public function fetchAll() {
        $rs = array();
        $rsAll = array();
        while($rs = mysql_fetch_array($this->result)) {
            $rsAll[] = $rs;
        }
        return $rsAll;
    }

    public function __destruct() {
        mysql_close($this->_dblink);
    }
}

复制PHP内容到剪贴板PHP代码:
//test.php
$db = new Db('localhost', 'root', '', 'hent_qxoa');
$db->query("SELECT * FROM qx_user ;");
var_dump($db->fetchAll());