在prestashop中创建模块:error'；找不到类模块'；

php4中有一个presta模块。它通过连接到prestashop的数据库并打印出xml来工作。当人们试图上传到他们的应用商店时，他们要求我把它做成php5，并遵循某些程序。

• 简而言之，它只是一个完整的结构代码，带有1个方法，可以连接到prestashop数据库并打印出xml

所以问题是如何使它符合prestashop所要求的php5标准。当我尝试时，我得到了这个错误。"找不到类模块"

<?php
include('config/settings.inc.php');
$con = mysql_connect(_DB_SERVER_, _DB_USER_, _DB_PASSWD_);
mysql_select_db(_DB_NAME_);
$str = '_DB_PREFIX_';
$str1 = constant($str);
$sql = 'SELECT '.
$str1.'product_lang.name,'.
$str1.'product.id_product as id,'.
$str1.'product.quantity,'.
$str1.'product.price,'.
$str1.'product.weight,'.
$str1.'product_lang.description,'.
$str1.'product_lang.link_rewrite as url,'.
$str1.'category_lang.name as category,'.
$str1.'manufacturer.name as manufacturer,'.
$str1.'image.id_image '.
'FROM '.
$str1.'product_lang '.
'INNER JOIN ' .$str1.'product '.
'ON ('.$str1.'product_lang.id_product = '.$str1.'product.id_product) '.
'INNER JOIN ' .$str1.'image '.
'ON ('.$str1.'image.id_product = '.$str1.'product.id_product) '.
'INNER JOIN ' .$str1.'manufacturer '.
'ON ('.$str1.'manufacturer.id_manufacturer = '.$str1.'product.id_manufacturer) '.
'INNER JOIN ' .$str1.'category_lang '.
'ON ('.$str1.'category_lang.id_category = '.$str1.'product.id_category_default) '.
//'WHERE '.$str1.'product_lang.id_lang = 1 AND '.$str1.'category_lang.id_lang = 1';
    'WHERE '.$str1.'product_lang.id_lang = 1';
    $result = mysql_query($sql);
     header("Content-Type: text/xml; charset=ISO-8859-1");
     $output = '<?xml version="1.0" encoding="utf-8"?>
     <products>';
     while($row = mysql_fetch_assoc($result)):
     //echo "<br><br><b>text:</b>".$text = addslashes($text);
     $text = str_replace(chr(145), "''", $text);
 $output .= '
<product>
    <id>'. $row['id'].'</id>
    <name><![CDATA['.$name.']]></name>
    <description><![CDATA['.$text.']]></description>
            <image><![CDATA['. 'http://'.$_SERVER['HTTP_HOST'].__PS_BASE_URI__.'img/p/'.$row['id'].'-'.$row['id_image'].'.jpg' .']]></image>
        <quantity><![CDATA['. $row['quantity'] .']]></quantity> 
        <price><![CDATA['. $row['price'] .']]></price>
        <weight>'. $row['weight'] .'</weight>
    <category><![CDATA['.$category.']]></category>
    <manufacturer><![CDATA['. $manufacturer.']]></manufacturer>
            <url><![CDATA['.'http://'.$_SERVER['HTTP_HOST'].'/product.php?id_product='.$row['id'].']]></url>
     </product>';
 endwhile;
 print $output .= '
 </products>';

这是我需要从prestashop 中遵循的编码过程

<?php
       //Your class must have the same name than this file.
      class module_name extends Module
       {
      public function __construct()
       {
    //Name of your module. It must have the same name than the class
    $this->name = 'module_name';
    //You must choose an existing tab amongst the ones that are available
    $this->tab = 'You choose';
    //The version of your module. Do not forget to increment the version for each modification
    $this->version = '1.0';
    //The constructor must be called after the name has been set, but before you try to use any functions like $this->l()
    parent::__construct();
    //Name displayed in the module list
    $this->displayName = $this->l('Display Name on Back Office');
    //Short description displayed in the module list
    $this->description = $this->l('Description On Back Office');    
}
//You must implement the following methods if your module need to create a table, add configuration variables, or hook itself somewhere.
//-------------------------------
public function install()
{
    return parent::install();
}
public function uninstall()
{
    return parent::install();
}
//-------------------------------
//Display Configuration page of your module.
public function getContent()
{
    return 'Hello World!';
}
   }
 ?>