The intension of this article is to explain how the PHP class
instances(objects) are transferred among PHP pages with the use of
sessions. All the objects (including contents) will be serialized,
then compressed and encrypted prior to store in the user session.
When retrieving
the object from the session variable, you need to remember that it is
in the base64 decrypted format. Once you decrypt the object, you will
get the object as a deflated string(compressed data). Then you need
to inflate (decompress) the deflated string. Then you will get the
serialized object(instance). Then you need to deserialized
(unserialized) the instance to construct the original instance.
we will go through each of the source code files as below.
ConfigData.php
<?php
/**
* Created by
* User: Chathuranga Tennakoon
* Email: chathuranga.t@gmail.com
* Blog: http://chathurangat.blogspot.com
* Date: 03/29/12
* Time: 9:13 AM
* IDE: JetBrains PhpStorm.
*/
class ConfigData
{
private $name;
private $email;
private $website;
public function setEmail($email)
{
$this->email = $email;
}
public function getEmail()
{
return $this->email;
}
public function setName($name)
{
$this->name = $name;
}
public function getName()
{
return $this->name;
}
public function setWebsite($website)
{
$this->website = $website;
}
public function getWebsite()
{
return $this->website;
}
}
?>
TestInterface.php<?php
/**
* Created by
* User: Chathuranga Tennakoon
* Email: chathuranga.t@gmail.com
* Blog: http://chathurangat.blogspot.com
* Date: 03/29/12
* Time: 9:13 AM
* IDE: JetBrains PhpStorm.
*/
interface TestInterface
{
public function getInstance();
public function setInstance(ConfigData $cfgData);
}
?>
TestImpl.php<?php
/**
* Created by
* User: Chathuranga Tennakoon
* Email: chathuranga.t@gmail.com
* Blog: http://chathurangat.blogspot.com
* Date: 03/29/12
* Time: 9:13 AM
* IDE: JetBrains PhpStorm.
*/
include "interfaces/TestInterface.php";
include "config/ConfigData.php";
class TestImpl implements TestInterface
{
private $config = NULL;
public function getInstance()
{
return $this->config;
}
public function setInstance(ConfigData $cfgData){
$this->config = $cfgData;
}
}
?>
testSend.php<?php
/**
* Created by
* User: Chathuranga Tennakoon
* Email: chathuranga.t@gmail.com
* Blog: http://chathurangat.blogspot.com
* Date: 03/29/12
* Time: 9:13 AM
* IDE: JetBrains PhpStorm.
*/
session_start();
include "classes/TestImpl.php";
$testImpl = new TestImpl();
$config = new ConfigData();
$config->setName("chathuranga tennakoon");
$config->setEmail("chathuranga.t@gmail.com");
$config->setWebsite("http://chathurangat.blogspot.com");
$testImpl = new TestImpl();
$testImpl->setInstance($config);
$_SESSION["TestImplObject"] = base64_encode(gzdeflate(serialize($testImpl)));
?>
testReceive.php<?php session_start(); include "classes/TestImpl.php"; $testImpl = new TestImpl(); //printing the session data as it is echo "<b>Session Data (Encrypted) </b>[".$_SESSION["TestImplObject"]."]<br/><br/>"; //decrypt the session data with base64 decryption mechanism echo "<b>Decrypted Session Data in DEFLATE data format (Deflated Session Data) </b>[".base64_decode($_SESSION["TestImplObject"])."]<br/><br/>"; //inflating the deflated string echo "<b>Inflated Value of the Deflated Value (Unserialized Object) </b>[".gzinflate(base64_decode($_SESSION["TestImplObject"]))."]<br/><br/>"; //unserializing the serialized object echo "<b>Unserializing the Serialized Object (Serialized Object) </b>[".unserialize(gzinflate(base64_decode($_SESSION["TestImplObject"])))."]<br/><br/>"; //do all above operations in a single statement(line) $testImpl = new TestImpl(); $testImpl = unserialize(gzinflate(base64_decode($_SESSION["TestImplObject"]))); echo "TestImpl Instance (Serialized Shared Instance) <br/>"; //getting the instance of class ConfigData $configInstance = new ConfigData(); $configInstance = $testImpl->getInstance(); //retrieving the object reference ID of the $configInstance echo "Object Reference ID of the retrieved instance of ConfigData class [".spl_object_hash($configInstance)."] <br/> <br/> <br/>"; echo "<b>Retrieved Member variable data of the instance of ConfigData class</b> <br/><br/>"; echo " <b>Name </b>[".$configInstance->getName()."]<br/><br>"; echo " <b>Email </b>[".$configInstance->getEmail()."]<br/><br>"; echo " <b>Website </b>[".$configInstance->getWebsite()."]<br/><br>"; ?>
output of the testReceive.php is as follows.
The sample application is available to be downloaded through the following link.
Download Source Code
Hope this will be helpful for you !!!
Thanks and Regards
Chathuranga Tennakoon
chathuranga.t@gmail.com
