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<?php
/**
* The php memory implementation of the StudipCache interface.
*
* @author Jan-Hendrik Willms <tleilax+studip@gmail.com>
* @license GPL2 or any later version
* @since Stud.IP 5.0
*/
class StudipMemoryCache implements StudipCache
{
protected $memory_cache = [];
/**
* Expires just a single key.
*
* @param string the key
*/
public function expire($key)
{
unset($this->memory_cache[$key]);
}
/**
* Expire all items from the cache.
*/
public function flush()
{
$this->memory_cache = [];
}
/**
* Reads just a single key from the cache.
*
* @param string the key
*
* @return mixed the corresponding value
*/
public function read($key)
{
if (!isset($this->memory_cache[$key])) {
return false;
}
if ($this->memory_cache[$key]['expires'] < time()) {
$this->expire($key);
return false;
}
return $this->memory_cache[$key]['data'];
}
/**
* Store data at the server.
*
* @param string the item's key.
* @param mixed the item's content (will be serialized if necessary).
* @param int the item's expiry time in seconds. Defaults to 12h.
*
* @returns mixed returns TRUE on success or FALSE on failure.
*
*/
public function write($name, $content, $expire = self::DEFAULT_EXPIRATION)
{
$this->memory_cache[$name] = [
'expires' => time() + $expire,
'data' => $content,
];
}
}
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