Use PHP to implement global variables like Application in JSP and ASP

Use PHP to implement global variables like Application in JSP and ASP_PHP Tutorial
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Release： 2016-07-21 15:58:19
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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); 
 } 
} 

?> 