//
// Simple REQUEST_URI-based caching system
// author: yinsee@gmail.com
// * require output buffering to be enabled
//
// example use:
// include("class.URI_Cache.php");
// $c = new URI_Cache(); // with just 1 line of code to enable auto caching.
// $c = new URI_Cache(10); // set duration to 10 seconds
class URI_Cache
{
var $cache_dir = "/.cache_pages";
var $cache_duration = 30; // cache duration, in seconds
welcome to phpsu.com
var $cache_ext = ".html";
var $debug = 0;
var $need_cache = true;
//class constructor, take care of cache directory creation
//if autorun set to false, call Load() manually to load from cache
function URI_Cache($dur=0,$dir='',$ext='',$load_and_exit=true) welcome to phpsu.com
{
if (!ob_list_handlers())
{
if ($this->debug)
print("Warning: Output buffering is not enabled. I am enabling it.");
ob_start('ob_gzhandler'); phpsu
}
if ($dur) $this->cache_duration = $dur;
if ($dir) $this->cache_dir = $dir;
if ($ext) $this->cache_ext = $ext;
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$this->cache_dir = $_SERVER['DOCUMENT_ROOT']."/".$this->cache_dir;
if ($load_and_exit) $this->Load();
// check if output buffering is enabled...
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if (!file_exists($this->cache_dir))
{
mkdir($this->cache_dir);
chmod($this->cache_dir,0777); phpsu提供的php教程
}
}
function __destruct()
{
if ($this->need_cache) return $this->CachePage();
}
// load cached content.
// if exit is true, output cached content and exit() when load success
// if exit is false, return cached content
function Load($exit=true) do you kown phpsu.com?
{
$cachefile = "$this->cache_dir/".md5($_SERVER['REQUEST_URI']).$this->cache_ext;
if (file_exists($cachefile))
{
if (filemtime($cachefile) > time()-$this->cache_duration) phpsu.com
{
$this->need_cache = false;
if ($exit) {
print file_get_contents($cachefile);
if ($this->debug) print "<br />This page is cached by interval of $this->cache_duration.<br />Now: ".time();
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exit;
}
return file_get_contents($cachefile);
}
else
unlink($cachefile); // delete expired cache
} welcome to phpsu.com
return false;
}
// cache the current page
function CachePage()
{
$cachefile = "$this->cache_dir/".md5($_SERVER['REQUEST_URI']).$this->cache_ext;
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if ($this->debug) print "<br />Cached: ".time();
file_put_contents($cachefile, ob_get_contents());
if ($this->debug) print "<br />Cache renewed\n";
} www.phpsu.com
}
TITLE:class.URI_Cache.php