PHP partial content caching script

bpbp · October 9, 2007

Hi I found this script on the net and I think its great it caches my dynamic mysql content in to static pages to reduce load on the server. There is one problem I can't figure out.. When i run the script it shows the dynamic mysql content plus content from the cache right below it. I have settings in place where if file cache is not old then it should load, but for some reason the dynamic content loads anyway.

Any thoughs on how i can prevent the script to show the dynamic mysql content, when the cache file is still valid?

<html>
<body>
<hr>
Header
<hr>
<?
// PHP Fast File Cache v0.1b
// Written by Åke Wallebom (ake at ake nu)
// Free to use for non-commercial purposes

$cache_cacheDirectory = '/home/class/public_html/cache/';
if (!isset($cache_refreshTime)) {
	$cache_refreshTime = 5; // seconds to keep a cached copy
}

/////
// No configuration beyond this line
/////

function cache_fopen_exclusive($id) {
	if ($fp = fopen($id, "ab+")) {
		if (flock($fp, LOCK_EX | LOCK_NB)) {
			return $fp;
		} else {
			fclose($fp);
		}
	}

	return false;
}

function cache_fclose_exclusive($fp) {
	flock($fp, LOCK_UN);
	fclose($fp);
}

// Create cache file name
if (isset($cache_parameters) && is_array($cache_parameters)) {
	$cache_id_param = '';
	foreach($cache_parameters as $value) {
		if (isset($_REQUEST[$value])) {
			$cache_id_param = $cache_id_param . '_' . $value . '=' . $_REQUEST[$value];
		}
	}

	$cache_id = md5($_SERVER['REQUEST_URI']) . '_' . md5($cache_id_param);
} else {
	$cache_id = md5($_SERVER['REQUEST_URI']);
}
$cache_cacheFile = $cache_cacheDirectory . $cache_id . '.cache.html';

$cache_FileExists = file_exists($cache_cacheFile);
$cache_FileIsFresh = $cache_FileExists && (time() - filemtime($cache_cacheFile) < $cache_refreshTime);

// Check if cache file is usable or not
if ($cache_FileIsFresh) {
	$cache_UseCache = true;
} else {
	$cache_UseCache = false;
	if ($cache_fp_lock = cache_fopen_exclusive($cache_cacheFile . '.lock')) {
		// We got the lock, create new cache
		$cache_UpdateCache = true;
	} else {
		// We didn't get the lock, use old file or regenerate
		$cache_UseCache = $cache_FileExists;
		$cache_UpdateCache = false;
	}
}	


// We will update the cache file and should not abort if the user cancels the request
if ($cache_UpdateCache) {
	ignore_user_abort(true);
}

// Output cached content
if ($cache_UseCache) {
	// Display the cached file
	readfile($cache_cacheFile);
	//exit;
}
else {
// We need to regenerate the page...
ob_start();
}
?>

Hello World<br>
Here is the content that is needed to be cached.

<?
// PHP Fast File Cache v0.1b
// Written by Åke Wallebom (ake at ake nu)
// Free to use for non-commercial purposes

// Get all output data and save to cache file
if ($cache_UpdateCache) {
	if ($cache_fp = fopen($cache_cacheFile . '.new', "wb")) {
		$cache_data = ob_get_contents();
		fwrite($cache_fp, $cache_data, strlen($cache_data));
		fclose($cache_fp);
		rename($cache_cacheFile . '.new', $cache_cacheFile);
	}

	// Close and remove the lock-file
	cache_fclose_exclusive($cache_fp_lock);
	$cache_er_old = error_reporting(0);
	unlink($cache_cacheFile . '.lock');
	error_reporting($cache_er_old);

	// The script can now be aborted by the user without any problems		
	ignore_user_abort(false);
} 

if (!$cache_UseCache)
ob_end_flush();

?>
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PHP partial content caching script

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