Yii2 Bootstrap 3
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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\caching;
/**
* XCache provides XCache caching in terms of an application component.
*
* To use this application component, the [XCache PHP extension](http://xcache.lighttpd.net/) must be loaded.
* Also note that the [[flush()]] functionality will work correctly only if "xcache.admin.enable_auth"
* is set to "Off" in php.ini.
*
* See [[Cache]] for common cache operations that XCache supports.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class XCache extends Cache
{
/**
* Retrieves a value from cache with a specified key.
* This is the implementation of the method declared in the parent class.
* @param string $key a unique key identifying the cached value
* @return string the value stored in cache, false if the value is not in the cache or expired.
*/
protected function getValue($key)
{
return xcache_isset($key) ? xcache_get($key) : false;
}
/**
* Stores a value identified by a key in cache.
* This is the implementation of the method declared in the parent class.
*
* @param string $key the key identifying the value to be cached
* @param string $value the value to be cached
* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
protected function setValue($key, $value, $expire)
{
return xcache_set($key, $value, $expire);
}
/**
* Stores a value identified by a key into cache if the cache does not contain this key.
* This is the implementation of the method declared in the parent class.
*
* @param string $key the key identifying the value to be cached
* @param string $value the value to be cached
* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
* @return boolean true if the value is successfully stored into cache, false otherwise
*/
protected function addValue($key, $value, $expire)
{
return !xcache_isset($key) ? $this->setValue($key, $value, $expire) : false;
}
/**
* Deletes a value with the specified key from cache
* This is the implementation of the method declared in the parent class.
* @param string $key the key of the value to be deleted
* @return boolean if no error happens during deletion
*/
protected function deleteValue($key)
{
return xcache_unset($key);
}
/**
* Deletes all values from cache.
* This is the implementation of the method declared in the parent class.
* @return boolean whether the flush operation was successful.
*/
protected function flushValues()
{
for ($i = 0, $max = xcache_count(XC_TYPE_VAR); $i < $max; $i++) {
if (xcache_clear_cache(XC_TYPE_VAR, $i) === false) {
return false;
}
}
return true;
}
}