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18 years ago
Making SimpleXMLElement objects session save.



Besides the effect of not surviving sessions, the SimpleXMLElement object may even crash the session_start() function when trying to re-enter the session!



To come up with a solution for this, I used a pattern as follows. The core idea is to transform the SimpleXMLElement between session calls to and from a string representation which of course is session save.



<?php

  //

  // session save handling of SimpleXMLElement objects

  // (applies to/ tested with PHP 5.1.5 and PHP 5.2.1)

  // The myClass pattern allows for conveniently accessing

  // XML structures while being session save

  //

  class myClass

  {

    private $o_XMLconfig = null;

    private $s_XMLconfig = '';

    

    public function __construct($args_configfile)

    {

      $this->o_XMLconfig = simplexml_load_file($args_configfile);

      $this->s_XMLconfig = $this->o_XMLconfig->asXML();

    } // __construct()

    

    public function __destruct()

    {

      $this->s_XMLconfig = $this->o_XMLconfig->asXML();

      unset($this->o_XMLconfig); // this object would otherwise crash 

                                 // the subsequent call of 

                                 // session_start()!

    } // __destruct()

    

    public function __wakeup()

    {

      $this->o_XMLconfig = simplexml_load_string($this->s_XMLconfig);

    } // __wakeup()

    

  } // class myClass

?>
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