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Object Serialization:
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language functions , include functions , variable functions , post functions




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Klassen und Objekte (PHP 5)
PHP Manual

Object Serialization

Serializing objects - objects in sessions

serialize() returns a string containing a byte-stream representation of any value that can be stored in PHP. unserialize() can use this string to recreate the original variable values. Using serialize to save an object will save all variables in an object. The methods in an object will not be saved, only the name of the class.

In order to be able to unserialize() an object, the class of that object needs to be defined. That is, if you have an object of class A and serialize this, you'll get a string that refers to class A and contains all values of variables contained in it. If you want to be able to unserialize this in another file, an object of class A, the definition of class A must be present in that file first. This can be done for example by storing the class definition of class A in an include file and including this file or making use of the spl_autoload_register() function.

<?php
// classa.inc:
  
  
class {
      public 
$one 1;
    
      public function 
show_one() {
          echo 
$this->one;
      }
  }
  
// page1.php:

  
include("classa.inc");
  
  
$a = new A;
  
$s serialize($a);
  
// store $s somewhere where page2.php can find it.
  
file_put_contents('store'$s);

// page2.php:
  
  // this is needed for the unserialize to work properly.
  
include("classa.inc");

  
$s file_get_contents('store');
  
$a unserialize($s);

  
// now use the function show_one() of the $a object.  
  
$a->show_one();
?>

If an application is using sessions and uses session_register() to register objects, these objects are serialized automatically at the end of each PHP page, and are unserialized automatically on each of the following pages. This means that these objects can show up on any of the application's pages once they become part of the session. However, session_register() is deprecated as of PHP 5.3.0, and removed as of PHP 6.0.0. Reliance on this function is not recommended.

It is strongly recommended that if an application serializes objects, for use later in the application, that the application include the class definition for that object throughout the application. Not doing so might result in an object being unserialized without a class definition, which will result in PHP giving the object a class of __PHP_Incomplete_Class_Name, which has no methods and would render the object useless.

So if in the example above $a became part of a session by running session_register("a"), you should include the file classa.inc on all of your pages, not only page1.php and page2.php.


Klassen und Objekte (PHP 5)
PHP Manual

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