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

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