[OOP]classi e funzioni

[whisher]

Ciao.
In OOP si chiama composition.
Eccoti un esempio
(è un abbozzo non è completa):

<?php 
class AbstractDb
{
    //////
    // Legend :
    // private $__varName
    // public  $varName
    /////
    var $__host; 
    var $__user; 
    var $__password; 
    var $__database;
    var $conId; // connection identifier 
    var $result;
    function AbstractDb($options=array())
    {
        if(count($options)>0)
        {
            foreach($options as $parameter => $value)
            {
                (!empty($value))?$this->{$parameter}=$value:$this->isError('Invalid parameter '.$parameter);

            }
            $this->conId = NULL;
            $this->result = NULL;
            $this->__connectDB();
        }
        else 
        {
            $this->isError('No connection parameters were provided');

        }
    }
       function __connectDB()
    {
        if(!$this->conId=mysql_connect($this->__host,$this->__user,$this->__password))
        {
            $this->isError('Error connecting to the server');
        }
        if(!mysql_select_db($this->__database,$this->conId))
        {
            $this->isError('Error selecting database'.' '.$this->__database);
        }
    }
    function safeQuery($value)
    {
        if(!is_resource($this->conId))
        {
            $this->__connectDB();
        }
        if (get_magic_quotes_gpc()) 
        {
           $value = stripslashes($value);
        }
        if (!is_numeric($value)) 
        {
           $value = "'".mysql_real_escape_string($value)."'";
        }
       return $value;
    }
    function performQuery($query)
    {    
        if(!is_resource($this->conId))
        {
            $this->__connectDB();
        }
        if(!$this->result=mysql_query($query,$this->conId))
        {
            $this->isError('Error performing query '.$query);
        }
        // return new Result object
        return new ResultDb($this);
    }
    function getInsertId()
    {
        if(!$id=mysql_insert_id($this->conId))
        {
            $this->isError('Error getting ID');
        }
        return $id;
    }
    function isError($errorMsg)
    {
            $error = mysql_errno() . ": " . mysql_error() ;
            exit($errorMsg.' '.$error);
    }
    function closeConId()
    {
        mysql_close($this->conId);
    }

}//END AbstractDb

class ResultDb 
{
    var $mysql; // instance of AbstractDb object
    function ResultDb(&$mysql)
    {
        $this->mysql=&$mysql;
    }
    function fetchObject()
    {
        return mysql_fetch_object($this->mysql->result);
    }
    function fetchRowAss()
    {
         return mysql_fetch_array($this->mysql->result,MYSQL_ASSOC);
    }
    function fetchRowNum()
    {
         return mysql_fetch_array($this->mysql->result,MYSQL_NUM);
    }
    function getNumRows()
    {
        return mysql_num_rows($this->mysql->result);
    }
    
}//END ResultDb

?>