155 lines
3.4 KiB
PHP
155 lines
3.4 KiB
PHP
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<?php
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/**
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* class history
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* this class used to keep records of any changed to uploaded images under a session
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* @author Logan Cai (cailongqun [at] yahoo [dot] com [dot] cn)
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* @link www.phpletter.com
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* @since 22/May/2007
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*
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*/
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class History
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{
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var $history = array(); //keep all changes
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var $path = ''; //path to the iamge
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var $session = null;
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/**
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* constructor
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*
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* @param string $path the path to the image
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* @param object $session an instance of session class
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*/
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function __construct($path, &$session)
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{
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$this->path = $path;
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$this->session = &$session;
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if (!isset($_SESSION[$this->path]))
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{
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$_SESSION[$this->path] = array();
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}
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}
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/**
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* constructor
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*
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* @param string $path the path to the image
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* @param object $session an instance of session class
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*/
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function History($path, &$session)
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{
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$this->__construct($path, $session);
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}
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/**
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* keep tracks of each changes made to an image
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*
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* @param string $key
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* @param string $info array('name', 'restorable', 'is_original')
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*/
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function add($info)
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{
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$_SESSION[$this->path][] = $info;
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}
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/**
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* get the lastest changes for restore
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*
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* @return array array('name', 'restorable', 'is_original')
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*/
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function getNumRestorable()
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{
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$output = 0;
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if (isset($_SESSION[$this->path]) && is_array($_SESSION[$this->path]))
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{
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foreach($_SESSION[$this->path] as $k=>$v)
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{
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if (!empty($v['restorable']) && empty($v['is_original']))
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{
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if (file_exists($this->session->getSessionDir() . $v['name']))
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{
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$output++;
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}else
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{
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}
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}
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}
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}
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return $output;
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}
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/**
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* get the path of image which keep the lastest changes
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*
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* @return return empty array when failed
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*/
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function getLastestRestorable()
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{
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if (isset($_SESSION[$this->path]) && is_array($_SESSION[$this->path]) && sizeof($_SESSION[$this->path]))
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{
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$sessionImages = array_reverse($_SESSION[$this->path], true);
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$lastestKey = '';
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foreach($sessionImages as $k=>$v)
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{
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if ($v['restorable'] && empty($v['is_original']) && file_exists($this->session->getSessionDir() . $v['name']))
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{
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return $sessionImages[$k];
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}
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}
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}
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return array();
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}
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/**
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* get the original image which is kept in the session folder
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*
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* @return array
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*/
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function getOriginalImage()
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{
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$outputs = array();
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if (isset($_SESSION[$this->path]) && is_array($_SESSION[$this->path]))
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{
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$sessionImages = array_reverse($_SESSION[$this->path], true);
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foreach($sessionImages as $k=>$v)
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{
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if (!empty($v['is_original']))
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{
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if (file_exists($this->session->getSessionDir() . $v['name']))
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{
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return array('info'=>$_SESSION[$this->path][$k], 'key'=>$k);
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}
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}
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}
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}
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return $outputs;
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}
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/**
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* remove the lastest restorable state
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*
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* @return boolean
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*/
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function restore()
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{
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if (isset($_SESSION[$this->path]) && is_array($_SESSION[$this->path]) && sizeof($_SESSION[$this->path]))
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{
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$sessionImages = array_reverse($_SESSION[$this->path], true);
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$lastestKey = '';
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foreach($sessionImages as $k=>$v)
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{
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if ($v['restorable'] && empty($v['is_original']))
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{
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unset($_SESSION[$k]);
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return true;
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}
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}
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}
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return false;
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}
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}
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?>
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