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<?php
namespace Yiisoft\Cache\Dependency;
use Yiisoft\Cache\CacheInterface;
use Yiisoft\Cache\Exception\InvalidConfigException;
/**
* FileDependency represents a dependency based on a file's last modification time.
*
* If the last modification time of the file specified via {@see fileName} is changed,
* the dependency is considered as changed.
* For more details and usage information on Cache, see the [guide article on caching](guide:caching-overview).
*/
final class FileDependency extends Dependency
{
private $fileName;
* @param string $fileName the file path or [path alias](guide:concept-aliases) whose last modification time is used to
* check if the dependency has been changed.
public function __construct(string $fileName)
$this->fileName = $fileName;
}
* Generates the data needed to determine if dependency has been changed.
* This method returns the file's last modification time.
* @param CacheInterface $cache the cache component that is currently evaluating this dependency
* @return mixed the data needed to determine if dependency has been changed.
* @throws InvalidConfigException if {@see fileName} is not set
protected function generateDependencyData(CacheInterface $cache)
if ($this->fileName === null) {
throw new InvalidConfigException('FileDependency::fileName must be set');
clearstatcache(false, $this->fileName);
return @filemtime($this->fileName);
yiisoft /
cache
