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-   -   storing class instance into session (http://www.talkphp.com/advanced-php-programming/3407-storing-class-instance-into-session.html)

nizzy 10-02-2008 02:50 AM
storing class instance into session
 
Do you think SetObject() method will work?


PHP Code:
class Session
{
    ...........
    ...........

    public function SetObject($class_name)
    {
        if(!isset($_SESSION[$class_name]))
        {
            $num_args = func_num_args();
            $params = array();

            if($num_args == 1)
            {
                $obj_ins = new $class_name();
            }
            elseif($num_args > 1)
            {
                $get_args = func_get_args();
                $params = array_shift($get_args);

                $obj_ins = call_user_func_array($class_name, $params);
                //$obj_ins = call_user_func_array(array($this, 'parent::__construct'), $params); // not sure about this one
            }

            $_SESSION[$class_name] = serialize(new $obj_ins());
        }
    }

    public function GetObject($class_name)
    {
        if(isset($_SESSION[$class_name]))
        {
            $instance = unserialize($_SESSION[$class_name]);

            if($instance instanceof $class_name)
            {
                return $instance;
            }
        }
    }
}

$sess_handler =& new Session();

//storing class instance into session
$sess_handler->SetObject('FooBar', $arg_1, $arg_2, $arg_3....etc);

//getting class instance from session
$foo_bar = $sess_handler->GetObject('FooBar');

$foo_bar->print_hello(); // this is a method in FooBar class 

Kalle 10-02-2008 03:49 AM
Its possible to serialize object instances and store them in session variables, you just have to remember to include the class declaring before the session_start() call, else deserialized instances will become an instance of __PHP_Incomplete_Class.

nizzy 10-02-2008 04:01 AM
yes, before session
 
Dear Kalle

Thanks for quick reply. Then my method will not work, because I am trying to store the FooBar class into $_SESSION var AFTER the session is created. I see this is the problem.

Now, how about this? is this the right way of applying the params to a CLASS (not a function)

$obj_ins = call_user_func_array($class_name, $params);

thank you

nizzy 10-02-2008 06:49 AM
I found my own solution
 
YES! you can store object instance into session AFTER session initialization.

THE WHOLE trick resides in these lines (requires php v5.1.3):
$reflection_obj = new ReflectionClass($class_name);
$obj_ins = $reflection_obj->newInstanceArgs($get_args);

PHP Code:
<?php

class FooBar
{
    public $arg_1;
    public $arg_2;
    public $arg_3;

    public function __construct($arg_1, $arg_2, $arg_3)
    {
        $this->arg_1 = $arg_1;
        $this->arg_2 = $arg_2;
        $this->arg_3 = $arg_3;
    }

    public function hello()
    {
        return "hello from __CLASS__, arg_1: " . $this->arg_1 . ", arg_2: " . print_r($this->arg_2, true) . ", arg_3: " . $this->arg_3;
    }
}

class Session
{
    public function __construct()
    {
        session_start(); 
    }

    public function SetObject($class_name)
    {
        unset($_SESSION[$class_name]); 

        if(!isset($_SESSION[$class_name]))
        {
            $num_args = func_num_args();
            $params = array();

            if($num_args == 1)
            {
                $obj_ins = new $class_name();
            }
            elseif($num_args > 1)
            {
                $get_args = func_get_args();
                array_shift($get_args);

                $reflection_obj = new ReflectionClass($class_name); 
                $obj_ins = $reflection_obj->newInstanceArgs($get_args); 
            }

            $_SESSION[$class_name] = serialize($obj_ins);
        }
    }

    public function GetObject($class_name)
    {
        if(isset($_SESSION[$class_name]))
        {
            $instance = unserialize($_SESSION[$class_name]);

            if($instance instanceof $class_name)
            {
                return $instance;
            }
        }
    }
}

$sess_handler =& new Session();

//storing class instance into session
$sess_handler->SetObject('FooBar', 'first_str', array('hey', 'budy'), true);

//getting class instance from session
$foo_bar = $sess_handler->GetObject('FooBar');

//var_dump($foo_bar);

echo $foo_bar->hello(); // this is a method in FooBar class 

?>


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