src/TieredCache.php
public function clean()
    {
        $cleanCallback = function ($allCleaned, $cache) {
            return $allCleaned && $cache->clean();
        };
        return array_reduce($this->caches, $cleanCallback, true);
    }
public function clean()
    {
        $cleanCallback = function ($allCleaned, $cache) {
            return $allCleaned && $cache->clean();
        };
        return array_reduce($this->caches, $cleanCallback, true);
    }
public function clean ( ) { $ cleanCallback = function ( $ allCleaned , $ cache ) { return $ allCleaned && $ cache -> clean ( ) ; } ; return array_reduce ( $ this -> caches , $ cleanCallback , true ) ; }
Perform a clean operation on all caches.

@return bool Returns true if clean succeeded on all caches in the stack.
Perform a clean operation on all caches .