使用PHP无法在wordpress插件中显示类变量

问题描述：

I am working on a WordPress plugin and started working with classes to store information such as database settings. I have however run into a problem. I cannot output or echo the variables inside my classes. I created another test plugin just to test certain concepts. This is the plugin code from my test plugin to test classes:

<?php
/* WordPress Plugin */
//  create class
class test
{
    //  Variable
    public $HW = "HELLO WORLD!";

    //  Function to return variable
    public function getHW()
    {
         return $this->HW;
    }

    //  Function to set variable
    public function setHW($newHW)
    {
         $this->HW = $newHW;
    }
}

//  Initiate class
$classObj = new test();

//  Output data
function displayClass()
{
    echo "hello world!";
    echo $classObj->getHW();
}

//  Add code to display in wordpress
add_shortcode('test_hw', 'displayClass');
?>

I know that the wordpress section works because 'hello world!' displays on the page. However I cannot get the variables inside the class to load. It either prevents the page from loading or it doesn't display the variable. I cannot seem to find the error. Any help would be appreciated.

I have even tried code like this:

$classObj = new test();
$testHW = $classObj->getHW();

and

$classObj = new test();
$testHW = $classObj->HW;

Neither of these options work either. I am running Apache 2.4.6 with PHP 5.5.7 on Fedora 19.

我正在使用WordPress插件并开始使用类来存储数据库设置等信息。然而，我遇到了一个问题。我无法输出或回显我的类中的变量。我创建了另一个测试插件来测试某些概念。这是从我的测试插件到测试类的插件代码： p>

 ＆lt;？php 
 / * WordPress插件* / 
 //创建类
class test 
  {
 //变量
 public $ HW =“HELLO WORLD！”; 
 
 //返回变量的函数
公共函数getHW（）
 {
返回$ this-＆gt; HW; 
  } 
 
 //设置变量的函数
公共函数setHW（$ newHW）
 {
 $ this-＆gt; HW = $ newHW; 
} 
} 
 
 //启动类\  n $ classObj = new test（）; 
 
 //输出数据
function displayClass（）
 {
 echo“hello world！”; 
 echo $ classObj-＆gt; getHW（）; 
} \  n 
 //添加代码以显示在wordpress 
add_shortcode（'test_hw'，'displayClass'）; 
？＆gt; 
  code>  pre> 
 
 我知道wordpress 部分工作原因是'你好世界！' 显示在页面上。 但是我无法在类中获取要加载的变量。 它要么阻止页面加载，要么不显示变量。 我似乎无法找到错误。 任何帮助将不胜感激。 p> 
 
 
我甚至尝试过这样的代码： p> 
 
 
  $ classObj = new test（）; 
 $  testHW = $ classObj-＆gt; getHW（）; 
  code>  pre> 
 
 和 p> 
 
 
  $ classObj = new test（）  ; 
 $ testHW = $ classObj-＆gt; HW; 
  code>  pre> 
 
 这两个选项都不起作用。 我在Fedora 19上使用PHP 5.5.7运行Apache 2.4.6。 p> 
  div>

答

I don't think $classObj is available in the function, because it is instantiated outside it. You could try making $classObj global. It is not a recommended solution, but it seems to be a normal solution in WordPress. Try this code:

<?php
/* WordPress Plugin */
//  create class
class test
{
    //  Variable
    public $HW = "HELLO WORLD!";

    //  Function to return variable
    public function getHW()
    {
         return $this->HW;
    }

    //  Function to set variable
    public function setHW($newHW)
    {
         $this->HW = $newHW;
    }
}

//  Initiate class
global $classObj;
$classObj = new test();

//  Output data
function displayClass()
{
    global $classObj;
    echo "hello world!";
    echo $classObj->getHW();
}

displayClass();
?>

使用PHP无法在wordpress插件中显示类变量

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