<?php
class creroHtmlCache {
	static $htmlcacheexpires=7;
	static $cachedat=Array();
	public function __construct($htmlcache_expires){
		$this::$htmlcacheexpires=floatval($htmlcache_expires);
		if (file_exists('./htmlcache/cached.dat')){
			$this::$cachedat=unserialize(file_get_contents('./htmlcache/cached.dat'));
		}
		
		if ($this::$cachedat===false){
			unlink('./htmlcache/cached.dat');
		}
	//cleanup old pages
	if (is_array($this::$cachedat)){
		$cachedkeys=array_keys($this::$cachedat);
	
		foreach ($cachedkeys as $cachedkey){
			
			$cachedpage=$this::$cachedat[$cachedkey];
			
			if ((floatval($cachedpage['expires'])
					+floatval($this::$htmlcacheexpires*3600))
					<floatval(microtime(true))){
						unlink('./htmlcache/cached/'.$cachedpage['expires'].'.html');
						unset($this::$cachedat[$cachedkey]);
					}
			
			}
		
		$this->saveCacheDatToDisk();
	
		}
			
	}
	public function hasPageExpired($cachedkey){
		if (array_key_exists($cachedkey, $this::$cachedat))
			{
			$cachedpage=$this::$cachedat[$cachedkey];
			if (
					(floatval($cachedpage['expires'])
				+floatval($this::$htmlcacheexpires*3600))
				<floatval(microtime(true))
			
				){
					return true;
					
				}
			else {
				
				return false;
			}
		}
		else {
			return true;
		}
	}
	
	public function cachePage($cachedkey, $htmlCode){
		$willexpire=microtime(true);
		if (file_put_contents('./htmlcache/cached/'.floatval($willexpire).'.html', $htmlCode)){
			$pagedat=Array();
			$pagedat['expires']=''.floatval($willexpire).'';
			$this::$cachedat[$cachedkey]=$pagedat;
			return $this->saveCacheDatToDisk();
			
		}
		
	}
	public function getCachedPage($cachedkey){
		$page=$this::$cachedat[$cachedkey];
		return file_get_contents('./htmlcache/cached/'.$page['expires'].'.html');
	}
	public function getCachedPageDate($chachedkey){
		$page=$this::$cachedat[$cachedkey];
		if (file_exists('./htmlcache/cached/'.$page['expires'].'.html'))
			{
			return filemtime('./htmlcache/cached/'.$page['expires'].'.html');
			}
		else
			{
			return time();
			}
	}
	
	private function saveCacheDatToDisk(){
			return file_put_contents('./htmlcache/cached.dat', serialize ($this::$cachedat));
		
		
	}
	public function purgeCache(){
		unlink ('./htmlcache/cached.dat');
		if(scandir('./htmlcache/cached')!==false){
			$cachedfilez=array_diff(scandir('./htmlcache/cached'), array('..', '.'));
		
			foreach ($cachedfilez as $cachedfile){
				unlink ('./htmlcache/cached/'.$cachedfile);
				
			}
		unlink ('./htmlcache/cached.dat');
		}
	}
	public function purgePage($key){
		$page=$this::$cachedat[$key];
		unlink (file_get_contents('./htmlcache/cached/'.$page['expires'].'.html'));
		unset($this::$cachedat[$key]);
		return $this->saveCacheDatToDisk();
	}	
}

?>