PHP缓存类PHP-Cache-Kit
<?php
// PHP-Cache-Kit is an example of how to add modular caching to your PHP projects
// It is free for all use, but please do not re-distribute without this header.
// Most recent version available from http://acme-web-design.info/php-cache-kit.html
// Send suggestions to [email protected]
/*
// uses two global configuration variables: cache_active, cache_folder
// To use: set cache_active = true, assign cache_folder
// Next, call acmeCache::fetch instead of generating a page or module.
// Only if it returns false, build the section then call acmeCache::save.
// You only need these two functions and you do not need to
// create an object -- the class wrapping is just to avoid namespace
// conflicts with your existing code.
// Usage example:
// Do this stuff in your config file
include_once('cache-kit.php');
$cache_active = true;
$cache_folder = 'cache/';
// Now you can convert any time-consuming but rarely-changing data module into
// a fast cached module. This example rebuilds the calendar only every 5 minutes.
function helloWorld(){
$result = acmeCache::fetch('helloWorld', 10); // 10 seconds
if(!$result){
$result = '<h2> Hello world</h2> <p>Build time: '.date("F j, Y, g:i a").'</p>';
acmeCache::save('helloWorld', $result);
} else echo('Cached result<br/>');
return $result;
}
// now use the content module function just like you normally would -- caching is automatic!
echo(helloWorld());
*/
class acmeCache{
// public functionality, acmeCache::fetch() and acmeCache::save()
// =========================
function fetch($name, $refreshSeconds = 0){
if(!$GLOBALS['cache_active']) return false;
if(!$refreshSeconds) $refreshSeconds = 60;
$cacheFile = acmeCache::cachePath($name);
if(file_exists($cacheFile) and
((time()-filemtime($cacheFile))< $refreshSeconds))
$cacheContent = file_get_contents($cacheFile);
return $cacheContent;
}
function save($name, $cacheContent){
if(!$GLOBALS['cache_active']) return;
$cacheFile = acmeCache::cachePath($name);
acmeCache::savetofile($cacheFile, $cacheContent);
}
// for internal use
// ====================
function cachePath($name){
$cacheFolder = $GLOBALS['cache_folder'];
if(!$cacheFolder) $cacheFolder = trim($_SERVER['DOCUMENT_ROOT'],'/').'/cache/';
return $cacheFolder . md5(strtolower(trim($name))) . '.cache';
}
function savetofile($filename, $data){
$dir = trim(dirname($filename),'/').'/';
acmeCache::forceDirectory($dir);
$file = fopen($filename, 'w');
fwrite($file, $data); fclose($file);
}
function forceDirectory($dir){ // force directory structure
return is_dir($dir) or (acmeCache::forceDirectory(dirname($dir)) and mkdir($dir, 0777));
}
}
?>
// PHP-Cache-Kit is an example of how to add modular caching to your PHP projects
// It is free for all use, but please do not re-distribute without this header.
// Most recent version available from http://acme-web-design.info/php-cache-kit.html
// Send suggestions to [email protected]
/*
// uses two global configuration variables: cache_active, cache_folder
// To use: set cache_active = true, assign cache_folder
// Next, call acmeCache::fetch instead of generating a page or module.
// Only if it returns false, build the section then call acmeCache::save.
// You only need these two functions and you do not need to
// create an object -- the class wrapping is just to avoid namespace
// conflicts with your existing code.
// Usage example:
// Do this stuff in your config file
include_once('cache-kit.php');
$cache_active = true;
$cache_folder = 'cache/';
// Now you can convert any time-consuming but rarely-changing data module into
// a fast cached module. This example rebuilds the calendar only every 5 minutes.
function helloWorld(){
$result = acmeCache::fetch('helloWorld', 10); // 10 seconds
if(!$result){
$result = '<h2> Hello world</h2> <p>Build time: '.date("F j, Y, g:i a").'</p>';
acmeCache::save('helloWorld', $result);
} else echo('Cached result<br/>');
return $result;
}
// now use the content module function just like you normally would -- caching is automatic!
echo(helloWorld());
*/
class acmeCache{
// public functionality, acmeCache::fetch() and acmeCache::save()
// =========================
function fetch($name, $refreshSeconds = 0){
if(!$GLOBALS['cache_active']) return false;
if(!$refreshSeconds) $refreshSeconds = 60;
$cacheFile = acmeCache::cachePath($name);
if(file_exists($cacheFile) and
((time()-filemtime($cacheFile))< $refreshSeconds))
$cacheContent = file_get_contents($cacheFile);
return $cacheContent;
}
function save($name, $cacheContent){
if(!$GLOBALS['cache_active']) return;
$cacheFile = acmeCache::cachePath($name);
acmeCache::savetofile($cacheFile, $cacheContent);
}
// for internal use
// ====================
function cachePath($name){
$cacheFolder = $GLOBALS['cache_folder'];
if(!$cacheFolder) $cacheFolder = trim($_SERVER['DOCUMENT_ROOT'],'/').'/cache/';
return $cacheFolder . md5(strtolower(trim($name))) . '.cache';
}
function savetofile($filename, $data){
$dir = trim(dirname($filename),'/').'/';
acmeCache::forceDirectory($dir);
$file = fopen($filename, 'w');
fwrite($file, $data); fclose($file);
}
function forceDirectory($dir){ // force directory structure
return is_dir($dir) or (acmeCache::forceDirectory(dirname($dir)) and mkdir($dir, 0777));
}
}
?>
示例：
<?php
// Usage example:
// Do this stuff in your config file
include_once('cache-kit.php');
$cache_active = true;
$cache_folder = 'cache/';
// Now you can convert any time-consuming but rarely-changing data module into
// a fast cached module. This example rebuilds the calendar only every 5 minutes.
function helloWorld(){
$result = acmeCache::fetch('helloWorld', 10); // 10 seconds
if(!$result){
$result = '<h2> Hello world</h2> <p>Build time: '.date("F j, Y, g:i a").'</p>';
acmeCache::save('helloWorld', $result);
} else echo('Cached result<br/>');
return $result;
}
// now use the content module function just like you normally would -- caching is automatic!
echo(helloWorld());
?>
// Usage example:
// Do this stuff in your config file
include_once('cache-kit.php');
$cache_active = true;
$cache_folder = 'cache/';
// Now you can convert any time-consuming but rarely-changing data module into
// a fast cached module. This example rebuilds the calendar only every 5 minutes.
function helloWorld(){
$result = acmeCache::fetch('helloWorld', 10); // 10 seconds
if(!$result){
$result = '<h2> Hello world</h2> <p>Build time: '.date("F j, Y, g:i a").'</p>';
acmeCache::save('helloWorld', $result);
} else echo('Cached result<br/>');
return $result;
}
// now use the content module function just like you normally would -- caching is automatic!
echo(helloWorld());
?>
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