PHP 全局变量没有改变

Question

我对 PHP 和全局变量有疑问。在这段代码中：

在页面开始时，结果是：Test 123.
点击后：ListBox1点击结果为：XXXXXXXX.
点击后：ListBox2Click结果为：Test 123错误！

有什么方法可以改变全局变量吗？它需要从 "ListBox1Click" 函数内部更改并从以下代码显示："ListBox2Click" 函数。

<?php
  require_once("rpcl/rpcl.inc.php");
  //Includes
  use_unit("forms.inc.php");
  use_unit("extctrls.inc.php");
  use_unit("stdctrls.inc.php");

  //Class definition

  class Page1 extends Page
  {
    public $Label8 = null;
    global $someVar;
    $someVar = "Test 123";
    $this->Label8->Caption = $someVar;

    function ListBox1Click($sender, $params)
    {
      global $someVar;
      $someVar = "XXXXXXXX";
      $this->Label8->Caption = $someVar;
    }
    function ListBox2Click($sender, $params)
    {
      global $someVar;
      $this->Label8->Caption = $someVar;
    }
  }

  global $application;

  global $Page1;

  //Creates the form
  $Page1=new Page1($application);

  //Read from resource file
  $Page1->loadResource(__FILE__);

  //Shows the form
  $Page1->show();

?>

感谢帮助

Answer 1

您的解决方案可能如下所示：

<?php
  require_once("rpcl/rpcl.inc.php");
  //Includes
  use_unit("forms.inc.php");
  use_unit("extctrls.inc.php");
  use_unit("stdctrls.inc.php");

  //Class definition

  class Page1 extends Page
  {
    public $Label8 = null;
    private $someVar;

    public function __construct($application)
    {
        parent::__construct($application);

        //load from storage
        $this->someVar = $_SESSION['someVar'];
        $this->Label8->Caption = $this->someVar;


    }

    public function __destruct()
    {
          //save to storage
          $_SESSION['someVar'] = $this->someVar;
    }

    public function ListBox1Click($sender, $params)
    {
      $this->someVar = "XXXXXXXX";
      $this->Label8->Caption = $this->someVar;

    }

    public function ListBox2Click($sender, $params)
    {
      $this->Label8->Caption = $this->someVar;
    }
  }

  global $application;

  //Creates the form
  $Page1=new Page1($application);

  //Read from resource file
  $Page1->loadResource(__FILE__);

  //Shows the form
  $Page1->show();

?>

PHP 全局变量没有改变

PHP global variable is not changing

php

variables

global