PHP Classes

File: handlers/writeSometimes.inc.php

Recommend this page to a friend!
  Classes of Colin McKinnon   Stackable PHP Session Handler   ???   Download  
File: handlers/???
Role: Class source
Content typex: text/plain
Description: Reduce unnecessary writes to improve performance and scalability
Class: Stackable PHP Session Handler
Store session data with multiple session handlers
Author: By
Last change:
Date: 9 years ago
Size: 1,243 bytes
 

Contents

Class file image Download
<?php
/**
 * writeSometimes
 * a filter which reduces unnecessary writes
 */
class writeSometimes extends stackSess {
    private $dataread;

    function open($save_path, $name)
    {
        if ($this->shStackNext) {
                        return $this->shStackNext->open($save_path, $name);
        } else {
            trigger_error("writeSometimes session handler has no storage capability");
            return false;
        }
    }
    function read($session_id)
    {
        if ($this->shStackNext) {
            $session_data=$this->shStackNext->read($session_id);
            $this->dataread=sha1($session_id . $session_data);
            return $session_data;
        } else {
            return '';
        }
    }
    function write($session_id, $session_data)
    {
        if ($this->shStackNext) {
            $data_to_write=sha1($session_id . $session_data);
            if ($data_to_write!=$this->dataread) {
                            return $this->shStackNext->write($session_id, $session_data);
            }
            $age=time() - $this->shStackNext->lastAccessed();
            $max=ini_get('session.gc_maxlifetime');
            if ($age<$max && $age>0.7*$max) {
                return $this->shStackNext->write($session_id, $session_data);
            }
            if ($age>$max) {
                // session should have expired
                return false;
            }
            // write is redundant
            return true;
                }
        return false;
    }
}