php - Joomla 2.5 hello world模块开发

Question

我是 Joomla 2.5 模块开发的新手，所以我阅读了 This教程并复制并粘贴所有内容而无需更改，当我安装所有内容时在服务器端工作正常但在前端它显示此错误:

1) 严格标准:非静态方法 modUserDataHelper::getData() 不应在第 16 行的 C:\xampp\htdocs\joomla\modules\mod_userdata\mod_userdata.php 中静态调用

2) 严格的标准:在第 24 行的 C:\xampp\htdocs\joomla\modules\mod_userdata\helper.php 中只能通过引用分配变量

那么你能告诉我我的代码有什么问题吗？

文件:

mod_userdata.xml
mod_userdata.php
helper.php
index.html
tmpl/default.php
tmpl/index.html

mod_userdata.xml

<?xml version="1.0" encoding="UTF-8"?>
<extension type="module" version="1.7" client="site" method="upgrade">
 <name>User Data Module</name>
 <author>Minitek.gr</author>
 <creationDate>03/08/2011</creationDate>
 <copyright>Copyright (C) 2011. All rights reserved.</copyright>
 <license>http://www.gnu.org/licenses/gpl-2.0.html GNU/GPL</license>
 <authorEmail>your_email</authorEmail>
 <authorUrl>www.minitek.gr</authorUrl>
 <version>1.7.1</version>
 <description>Users Data Module</description>
 <languages>
 </languages>
 <files>
  <filename module="mod_userdata">mod_userdata.php</filename>
  <filename>mod_userdata.xml</filename>
  <filename>helper.php</filename>
  <filename>index.html</filename>
  <folder>tmpl</folder>
 </files>
 <config>
  <fields name="params">
   <fieldset name="basic">
    <field name="moduleclass_sfx" type="text" default="" label="Module Class Suffix" description="Suffix for individual css styling" />
    <field name="limit" type="text" default="10" label="Limit Displayed Users" description="Limit Displayed Users" />
    <field name="user_id" type="radio" default="1" label="Display user ID" description="Display user ID">
     <option value="0">JNO</option>
     <option value="1">JYES</option>
    </field>
    <field name="user_name" type="radio" default="1" label="Display Name" description="Display Name">
     <option value="0">JNO</option>
     <option value="1">JYES</option>
    </field>
    <field name="user_username" type="radio" default="1" label="Display Username" description="Display Username">
     <option value="0">JNO</option>
     <option value="1">JYES</option>
    </field>
   </fieldset>
  </fields>
 </config>
</extension>

mod_userdata.php

<?php
/**
 * @package Joomla.Site
 * @subpackage  mod_userdata
 * @copyright   Copyright (C) 2005 - 2011 Open Source Matters, Inc. All rights reserved.
 * @license GNU General Public License version 2 or later; see LICENSE.txt
 */

// no direct access
defined('_JEXEC') or die;

// Include the syndicate functions only once
require_once dirname(__FILE__).'/helper.php';

// Get the user data
$list   = modUserDataHelper::getData($params);  // <-- ERROR IS HERE!!!

// Get the layout
require JModuleHelper::getLayoutPath('mod_userdata', $params->get('layout', 'default'));

helper.php

<?php
/**
 * @package     Joomla.Site
 * @subpackage  mod_userdata
 * @copyright   Copyright (C) 2005 - 2011 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

// no direct access
defined('_JEXEC') or die;

class modUserDataHelper
{
  function getData( &$params )
  {

   // Database query        
   $list = array();         
   $query = " SELECT id, name, username "               
   ." FROM #__users "
   ." WHERE block=0 "               
   ." ORDER BY id DESC "
   ." LIMIT " . $params->get( 'limit' );                
   $db =& JFactory::getDBO();   // <-- ERROR IS HERE!!!
   $db->setQuery( $query );     
   $rows = $db->loadObjectList();

   // Get list items
   if ($rows!=null)
   {
    $i=0;
    foreach ($rows as $row) 
    {               
     $list["users"][$i]["id"]=$row->id;
     $list["users"][$i]["name"]=$row->name;
     $list["users"][$i]["username"]=$row->username;
     $i++;      
    }
    return $list;
   }

  }
}

tmpl/default.php

<?php
/**
 * @package     Joomla.Site
 * @subpackage  mod_userdata
 * @copyright   Copyright (C) 2005 - 2011 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

// no direct access
defined('_JEXEC') or die; ?>

<div class="moduletable<?php echo $params->get( 'moduleclass_sfx' ) ?>">

 <ul>
  <?php for ($i=0;$i< sizeof($list["users"]); $i++) { ?>    

     <li>
      <?php if ($params->get( 'user_id' )) { ?>
         <span><?php echo $list["users"][$i]["id"];?></span>
        <?php } ?>
        <?php if ($params->get( 'user_name' )) { ?>
         <span><?php echo $list["users"][$i]["name"];?></span>
        <?php } ?>
        <?php if ($params->get( 'user_username' )) { ?>
         <span><?php echo $list["users"][$i]["username"];?></span>
        <?php } ?>
     </li>

    <?php } ?>
 </ul>

</div>

Answer 1

您启用了“严格标准”，由于代码是为(可能)php 5.3 而不是 5.4 编写的，因此会抛出一些错误。看起来对象正在被实例化或通过引用分配(&new MyClass 而不是 new MyClass)和 modUserDataHelper::getData()，这未定义为 static 正在被调用，就好像它是 static 一样。

您可以做两件事:关闭严格的标准(相当于在地毯下扫灰尘的代码)或修复错误代码。在这种情况下，调用 modUserDataHelper::getData() 是错误的形式。它需要从实例化对象调用，而不是从静态上下文调用。创建它的一个实例($tempObj 或类似的东西)然后从该对象调用方法($tempObj->getData();)。