序列化/反序列化/ OOP

Question

所以我正在练习一些oop的arround并试图做一个基本的oop用户类我试图让我的系统，以便在每一页上我可以只包括config.php和everthing我需要被加载，但由于某些原因，当我尝试登录它抛出我这个错误：

致命错误：调用一个成员函数的login（）一个非对象

的config.php：

<?php 
session_start(); 

// Mysql details 
$username = "torlolol"; 
$password = "torlolol"; 
$hostname = "localhost"; 
$database = "torlolol"; 

// Autoloads classes when needed 
function __autoload($class_name) { 
    include 'Classes/' . $class_name . '.php'; 
} 

$db = new DBConnector($hostname, $username, $password); 

// If there is no user in the session stored make a new one otherwise unserialize it 
if(empty($_SESSION['user'])) 
    $user = new User(); 
else 
    $user = unserialize($_SESSION['user']); 

function onExit() 
{ 
    //When exiting the page serialize the user object and store it in the session 
    $_SESSION['user'] = serialize($user); 
} 

register_shutdown_function("onExit") 
?> 

login.php

<?php 
include "config.php"; 
global $user; 
$user->LogIn(); 
?> 

用户等级：

class User { 
    public $Logged = false; 

    public function LogIn() 
    { 
     $this->Logged = true; 
    } 

    public function LogOut() 
    { 
     $this->Logged = false; 
    } 
} 
?> 

的index.php：

   <?php 
       include "config.php"; 
       global $user; 
       if ($user->Logged != true) 
        echo '<form action="login.php" method="post">Username :<input type="text" name="username" /> Password :<input type="password" name="password" />&nbsp;&nbsp;<input type="submit" value="Login" /></form>'; 
       else  
        echo '<form action="logout.php" method="post"><input style="submit" value="Logout" /></form>'; 

那么，为什么它抛出的错误？为什么它不在索引文件中发生：S ？>

Answer 1

您必须在开始会话之前包含类文件，否则序列化对象将无法正确加载。不幸的是......

Answer 2

通过删除，

global $user; 

因为当你被包括文件，$用户会自动在文件中包含。

Answer 3

如果您反序列化一个对象，哪个类尚未声明，它将被反序列化为__PHP_Incomplete_Class，这显然没有LogIn方法。所以，你要么需要手动包括文件，或者注册一个unserialize_callback_func：在config.php文件

ini_set('unserialize_callback_func', '__autoload'); 

Answer 4

您注册与用户的一个实例设置$ _SESSION [“用户”]关机功能（$用户变量）...但由于你管理instancied类的方式（通过使用全局变量），你需要在onExit函数中重新声明global $user;。

function onExit() 
{ 
    //When exiting the page serialize the user object and store it in the session 
    global $user; 
    $_SESSION['user'] = serialize($user); 
} 

我个人推荐拥有一个主要的全局类来处理整个应用程序中需要的类的实例。

编辑：看我的答案here

Answer 5

这里有一个类，它允许跟踪全局变量的变化：

abstract class CSTReportDelegate { 

    abstract public function emitVariableChange($variableName, $oldValue, $newValue); 
    abstract public function emitVariableSetNew($variableName, $newValue); 

} 

class CSTSimpleReportDelegate extends CSTReportDelegate { 

    public function emitVariableChange($variableName, $oldValue, $newValue) { 
     echo '<br />[global/change] '. $variableName . ' : ' . print_r($oldValue, true) . ' &rarr; ' . print_r($newValue, true); 
    } 

    public function emitVariableSetNew($variableName, $newValue) { 
     echo '<br />[global/init] '. $variableName . ' &rarr; ' . print_r($newValue, TRUE); 
    } 

} 


class CSysTracer { 

    static protected 
     $reportDelegate; 

    static private 
     $globalState = array(); 

    static private 
     $traceableGlobals = array(); 

    static private 
     $globalTraceEnabled = FALSE; 

    static public 
    function setReportDelegate(CSTReportDelegate $aDelegate) { 
     self::$reportDelegate = $aDelegate; 
    } 


    static public 
    function start() { 

     register_tick_function (array('CSysTracer', 'handleTick')); 

    } 


    static public 
    function stop() { 

     unregister_tick_function(array('CSysTracer', 'handleTick')); 

    } 

    static public 
    function evalAndTrace($someStatement) { 

     declare(ticks = 1); { 
      self::start(); 
      eval($someStatement); 
      self::stop(); 
     } 
    } 

    static public 
    function addTraceableGlobal($varName) { 

     if (is_array($varName)) { 
      foreach($varName as $singleName) { 
       self::addTraceableGlobal($singleName); 
      } 
      return; 
     } 

     self::$traceableGlobals[ $varName ] = $varName; 

    } 

    static public 
    function removeTraceableGlobal($varName) { 
     unset(self::$traceableGlobals[ $varName ]); 
    } 

    /** 
    * Main function called at each tick. Calls those functions, which 
    * really perform the checks. 
    * 
    */ 
    static public 
    function handleTick() { 

     if (TRUE === self::$globalTraceEnabled) { 
      self::traceGlobalVariable(); 
     } 

    } 

    static public 
    function enableGlobalsTrace() { 
     self::$globalTraceEnabled = TRUE; 
    } 


    static public 
    function disableGlobalsTrace() { 
     self::$globalTraceEnabled = FALSE; 
    } 

    static public 
    function traceGlobalVariable() { 

     foreach(self::$traceableGlobals as $aVarname) { 

      if (! isset($GLOBALS[ $aVarname ])) { 
       continue; 
      } 

      if (! isset(self::$globalState[ $aVarname ])) { 

       self::$reportDelegate->emitVariableSetNew($aVarname, $GLOBALS[ $aVarname ]); 
       self::$globalState[ $aVarname ] = $GLOBALS[ $aVarname ]; 
       continue; 
      } 

      if (self::$globalState[ $aVarname ] !== $GLOBALS[ $aVarname ]) { 

      self::$reportDelegate->emitVariableChange($aVarname, self::$globalState[ $aVarname ], $GLOBALS[ $aVarname ]); 

      } 

      self::$globalState[ $aVarname ] = $GLOBALS[ $aVarname ]; 

     } 

    } 

} 

使用方法如下：

CSysTracer::addTraceableGlobal(array('foo', 'bar')); 

CSysTracer::setReportDelegate(new CSTSimpleReportDelegate()); 
CSysTracer::enableGlobalsTrace(); 

CSysTracer::start(); 
declare(ticks = 1); 

    $foo = 10; 
    echo "<br>First output"; 
    $foo *= $foo; 
    $foo = 'bar'; 
     echo "<br>Next output"; 
    $otherFoo = array (1,2,3); 
    $bar = 23; 
    echo "<br>Finished!"; 

CSysTracer::stop(); 

Whill输出

[global/init] foo → 10 
Hi! 
[global/change] foo : 10 → 100 
[global/change] foo : 100 → bar 
Gotta run 
[global/change] foo : bar → Array ([0] => 1 [1] => 2 [2] => 3) 
[global/init] bar → 23 
Bye! 

尽管此版本CSysTracer跟踪全局变化，您可以创建变体traceGlobalVariable（）来跟踪会话变量或变化的变化方法通话。