public function __construct()
{
if (self::$cache_dir == null) {
self::$cache_dir = APPPATH . "../cache/filecache/";
self::$lifetime = 24 * 3 * 3600;
}
}
/**
* PHP5-style constructor
*
* @param array $config
*/
function __construct($config = array())
{
parent::__construct($config);
$this->_expire = isset($config['expire']) ? (int) $config['expire'] : 0;
if (!$this->_expire || $this->_expire > W3TC_CACHE_FILE_EXPIRE_MAX) {
$this->_expire = W3TC_CACHE_FILE_EXPIRE_MAX;
}
}
/**
* Overwritten I do not want to throw an exception...just ignore it! return default and delete.
* Retrieve a cached value entry by id.
*
* // Retrieve cache entry from file group
* $data = Cache::instance('file')->get('foo');
*
* // Retrieve cache entry from file group and return 'bar' if miss
* $data = Cache::instance('file')->get('foo', 'bar');
*
* @param string $id id of cache to entry
* @param string $default default value to return if cache miss
* @return mixed
* @throws Cache_Exception
*/
public function get($id, $default = NULL)
{
$filename = Cache_File::filename($this->_sanitize_id($id));
$directory = $this->_resolve_directory($filename);
// Wrap operations in try/catch to return default
try {
// Open file
$file = new SplFileInfo($directory . $filename);
// If file does not exist
if (!$file->isFile()) {
// Return default value
return $default;
} else {
// Open the file and parse data
$created = $file->getMTime();
$data = $file->openFile();
$lifetime = $data->fgets();
// If we're at the EOF at this point, corrupted!
if ($data->eof()) {
$this->_delete_file($file, NULL, TRUE);
return $default;
}
$cache = '';
while ($data->eof() === FALSE) {
$cache .= $data->fgets();
}
// Test the expiry
if ($created + (int) $lifetime < time()) {
// Delete the file
$this->_delete_file($file, NULL, TRUE);
return $default;
} else {
return unserialize($cache);
}
}
} catch (ErrorException $e) {
$this->_delete_file($file, NULL, TRUE);
return $default;
}
}
/**
* Delete a cache entry based on id
*
* // Delete 'foo' entry from the file group
* Cache::instance('file')->delete('foo');
*
* @param string id to remove from cache
* @return boolean
*/
public function delete($id)
{
$filename = Cache_File::filename($this->_sanitize_id($id));
$directory = $this->_resolve_directory($filename);
return $this->_delete_file(new SplFileInfo($directory . $filename), NULL, TRUE);
}
<?php
require_once "Cache_File.inc";
$cache = new Cache_File("second.cache", 10);
if ($text = $cache->get()) {
print $text;
exit;
}
$cache->begin();
?>
<html>
<body>
<!-- Cacheable for a day -->
Today is <?php
echo strftime("%A, %B %e %Y %H:%M:%S");
?>
</body>
</html>
<?php
$cache->end();
/**
* 文件修改时间
* @param $pKey
* @return int
*/
static function mtime($pKey)
{
$instance =& Cache_File::instance();
return is_file($instance->path . $pKey) ? filemtime($instance->path . $pKey) : 0;
}
/**
* Delete a cache entry based on id
*
* // Delete 'foo' entry from the file group
* Cache::instance('file')->delete('foo');
*
* @param string id to remove from cache
* @return boolean
*/
public function delete($id)
{
// for ProfilerToolbar
ProfilerToolbar::cacheLog('del', array_search($this, Cache::$instances), $id);
// /for ProfilerToolbar
$filename = Cache_File::filename($this->_sanitize_id($id));
$directory = $this->_resolve_directory($filename);
return $this->_delete_file(new SplFileInfo($directory . $filename), NULL, TRUE);
}
/**
* Set a value to cache with id and lifetime
*
* $data = 'bar';
*
* // Set 'bar' to 'foo' in file group, using default expiry
* Cache::instance('file')->set('foo', $data);
*
* // Set 'bar' to 'foo' in file group for 30 seconds
* Cache::instance('file')->set('foo', $data, 30);
*
* @param string $id id of cache entry
* @param string $data data to set to cache
* @param integer $lifetime lifetime in seconds
* @return boolean
*/
public function set($id, $data, $lifetime = NULL)
{
// dont set values when caching is disabled
if (Arr::get($this->_config, 'disabled', FALSE)) {
return FALSE;
}
$filename = Cache_File::filename($this->_sanitize_id($id));
$directory = $this->_resolve_directory($filename);
// If lifetime is NULL
if ($lifetime === NULL) {
// Set to the default expiry
$lifetime = Arr::get($this->_config, 'default_expire', Cache::DEFAULT_EXPIRE);
}
// Open directory
$dir = new SplFileInfo($directory);
// If the directory path is not a directory
if (!$dir->isDir()) {
// Create the directory
if (!mkdir($directory, 0777, TRUE)) {
// throw new Cache_Exception(__METHOD__.' unable to create directory : :directory', array(':directory' => $directory));
}
// chmod to solve potential umask issues
chmod($directory, 0777);
}
// Open file to inspect
$resouce = new SplFileInfo($directory . $filename);
$file = $resouce->openFile('w');
try {
$data = $lifetime . "\n" . serialize($data);
$file->fwrite($data, strlen($data));
return (bool) $file->fflush();
} catch (ErrorException $e) {
// If serialize through an error exception
if ($e->getCode() === E_NOTICE) {
// Throw a caching error
// throw new Cache_Exception(__METHOD__.' failed to serialize data for caching with message : '.$e->getMessage());
}
// Else rethrow the error exception
// throw $e;
}
}
public function wxAccessToken($appId = NULL, $appSecret = NULL)
{
$appId = is_null($appId) ? $this->appId : $appId;
$appSecret = is_null($appSecret) ? $this->appSecret : $appSecret;
$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" . $appId . "&secret=" . $appSecret;
$tKey = md5($url);
$access_token = Cache_File::get($tKey, 3600);
if (!empty($access_token)) {
return $access_token;
}
$result = $this->wxHttpsRequest($url);
//print_r($result);
$jsoninfo = json_decode($result, true);
$access_token = $jsoninfo["access_token"];
Cache_File::set($tKey, $access_token);
return $access_token;
}
/**
* 单例模式
*
* 用于本类的单例模式(singleton)实例化
*
* @access public
* @return object
*/
public static function getInstance()
{
if (!self::$_instance) {
self::$_instance = new self();
}
return self::$_instance;
}
