php cache 缓存方法类二

 php cache 缓存方法类二

<?php
/**
 * Cache class
 *
 * @author   Avenger <avenger@php.net>
 * @version  1.0
 * @update   2003-04-29 12:12:37
 */

class cache {

    /**
     * url wanta cached
     *
     * @var string
     */
    var $cached_file;

    /**
     * path to the cache save
     *
     * @var string
     */
    var $cached_path;

    /**
     * cached limit time
     *
     * @var string
     */
    var $cached_time;

    /**
     * expire time
     *
     * @var string
     */
    var $cached_modtime;

    /**
     * Construct function
     *
     * @access public
     * @param string $path Cached path
     * @param int $time Cached time
     * @return void
     */
    function cache($path='cache/',$time=120) {
        global $HTTP_SERVER_VARS;
        $query_str = preg_replace('/(&submit/.[x|y]=[0-9]+)+$/','',$HTTP_SERVER_VARS['REQUEST_URI']);
        $this->cached_file = md5($query_str).'.cache';
        $this->cached_path = $path;
        $this->cached_time = $time * 3600;
        if (is_dir($this->cached_path)===false) {
            mkdir($this->cached_path,0777);
        }
        if (file_exists($this->cached_path.$this->cached_file)) {
            $this->cached_modtime = date(time()-filemtime($this->cached_path.$this->cached_file));
        }
    }

    /**
     * Start the cache
     *
     * @access public
     */
    function start() {
        global $HTTP_GET_VARS;
        if ( ($HTTP_GET_VARS['update']!="") || (!file_exists($this->cached_path.$this->cached_file)) || ($this->chched_modtime > $this->cached_time) ) {
            ob_start();
        } else {
            readfile($this->cached_path.$this->cached_file);
            exit();
        }
    }

    /**
     * End the cache
     *
     * @access public
     */
    function end() {
        global $HTTP_GET_VARS;
        if ( ($HTTP_GET_VARS['update']!="") || (!file_exists($this->cached_path.$this->cached_file)) || ($this->chched_modtime > $this->cached_time) ) {
            $contents = ob_get_contents();
            ob_end_clean();
            $HTTP_GET_VARS['update']!="" ? chmod($this->cached_path.$this->cached_file,0777) : '';
            $fp = fopen($this->cached_path.$this->cached_file,'w');
            fputs($fp,$contents);
            fclose($fp);
            echo $contents;
        }
    }

    /**
     * Flush all cache
     *
     * @access public
     */
    function flush() {
        if (function_exists('exec')) {
            if (strpos(strtoupper(PHP_OS),'WIN') !== false) {
                $cmd = 'del /s '.str_replace('/','//',$this->cached_path).'*.cache';
            } else {
                $cmd = 'rm -rf '.$ADODB_CACHE_DIR.'/*.cache';
            }
            exec($cmd);
        } else {
            $d = dir($this->cached_path);
            while ($entry = $d->read()) {
                $modtime = date(time()-filemtime($this->cached_path.$entry));
                // if (($entry != ".") && ($entry != "..") && ($modtime > $this->cached_time)) {
                if (($entry != ".") && ($entry != "..")) {
                    chmod($this->cached_path.$entry,0777);
                    unlink($this->cached_path.$entry);
                }
            }
            $d->close();
        }
        return;
    }

} //End Class
?>

<?php
/*
run this scrpt,at the currerent dir,u will see a new folder names' "cache1"
in the "cache1" folder will have a file.the file's contents will be:

This is a Cache test line 1 ...
This is a Cache test line 2 ...
This is a Cache test line 3 ...

And if u wanta del all cache file,u will use:
$c->flush();

It's very easily to use,isn't it? :)
If u find a bug plz report to me: avenger@php.net
Read and learn!!  :)
*/

require_once
 
'cache.inc.php'
;

// Create Object
$c
 = 
new
 cache(
'cache1/'
,120); 
// The cache path and cache time

// Start,All the word between the start functon and the end function will be cached
$c
->start();

echo
 
"This is a Cache test line 1 .../n"
;
echo
 
"This is a Cache test line 2 .../n"
;
echo
 
"This is a Cache test line 3 .../n"
;

// End and output
$c
->
end
();

?>