Use PHP to implement global variables like Application in JSP and ASP_PHP Tutorial

复制代码 代码如下:

/**
* Function: implement global variables like Application in JSP and ASP
* author: [url]www.itzg.net[/url]
* version: 1.0
* Copyright: reproduced as shown Please keep the copyright statement
*/
/*+----------------example----------------------
require_once("Application.php");

$arr = array(0=>"Hi",1=>"Yes");
$a = new Application();
$a->setValue("t1","arui");
$a->setValue("arr",$arr);
$u = $a->getValue();
---------------------------------------------+*/
class Application
{
 /**File to save shared variables*/
 var $save_file    = 'Application/Application';
 /**The name of the shared variable*/
 var $application  = null;
 /**Serialized data*/
  var $app_data    = '';
  /**Have you done setValue operation to prevent frequent file writing operations?*/
  var $__writed    = false;

  /**
* Constructor
*/
  function Application()
  {
   $this->application = array();
  }
  /**
* Set global variables
* @param string $var_name The variable name to be added to the global variable
* @param string $var_value The value of the variable
*/
  function setValue($var_name,$var_value)
  {
   if (!is_string($var_name) || empty($var_name))
    return false;
   if ($this->__writed)
   {
    $this->application[$var_name] = $var_value;
    return;
   }
   $this->application = $this->getValue();
   if (!is_array($this->application))
    settype($this->application,"array");
   $this->application[$var_name] = $var_value;
   $this->__writed = true;
      $this->app_data = @serialize($this->application);    
      $this->__writeToFile();
  }
 /**
* Get the value stored in the global variable
* @return array
*/
 function getValue()
 {
     if (!is_file($this->save_file))
         $this->__writeToFile();
     return @unserialize(@file_get_contents($this->save_file));
 }
 /**
* Write serialized data to file
* @scope private
*/
 function __writeToFile()
 {
  $fp = @fopen($this->save_file,"w");
  @fwrite($fp,$this->app_data);
  @fclose($fp);
 }
}

?> 

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