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128 lines
3.0 KiB
128 lines
3.0 KiB
<?php
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/**
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* Cache for storing data.
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*
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* @license see /license.txt
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* @author Laurent Opprecht <laurent@opprecht.info> for the Univesity of Geneva
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*/
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class Cache
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{
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/**
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* Retrieve an item from the cache if item creation date is greater than limit.
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* If item does not exists or is stale returns false.
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*
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* @param any Identifier for the variable stored
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* @param int If this limit is greater than last mod time of value, stale
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* @return false|object Value kept in cache
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*/
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static function get($key, $limit = 0)
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{
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if (!self::has($key, $limit))
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{
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return false;
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}
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$path = self::path($key);
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return file_get_contents($path);
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}
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/**
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* Returnsn true if the cache has the item and it is not staled.
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*
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* @param any Identifier for the variable stored
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* @param int If this limit is greater than last mod time of value, stale
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* @return boolean
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*/
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static function has($key, $limit = 0)
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{
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$path = self::path($key);
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if (!is_readable($path))
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{
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return false;
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}
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if ($limit)
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{
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$mtime = filemtime($path);
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if ($mtime < $limit)
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{
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return false;
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}
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}
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return true;
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}
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/**
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* Put something in cache.
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*
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* @param any Identifier for the variable to be stored
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* @param string Value to be stored
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*/
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static function put($key, $value)
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{
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$path = self::path($key);
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file_put_contents($path, $value);
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}
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/**
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* Remove an item from the cache.
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*
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* @param any Identifier for the variable to remove
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*/
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static function remove($key)
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{
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$path = self::path($key);
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if (is_readable($path))
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{
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unlink($path);
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}
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}
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/**
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* Clear the cache. Remove all entries.
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*/
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static function clear()
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{
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$dir = self::path();
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$files = scandir($dir);
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$files = array_diff($files, array('.', '..'));
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foreach ($files as $file)
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{
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$path = $dir . $file;
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unlink($path);
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}
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}
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/**
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* Returns the file path based on the key.
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*
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* @param any Identifier for the variable
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* @return string Path of the file where this
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* variable is/should-be stored
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*/
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static function path($key = '')
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{
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return Chamilo::path('archive/temp/cache/' . self::key($key));
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}
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/**
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* Returns the internal string key from the external key.
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* For internal use.
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*
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* @param any Identifier for the variable
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* @return string Unique ID generated to identify the variable
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*/
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static function key($item)
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{
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if (is_object($item))
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{
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$f = array($item, 'get_unique_id');
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if (is_callable($f))
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{
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return call_user_func($f);
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}
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}
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$result = (string)$item;
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}
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}
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