Merge pull request #16 from php-cache/expiration_date

Make sure we check with expiration date if we got one

Author: cryptiklemur

src/CacheItem.php

@@ -114,6 +114,10 @@ public function isHit()
             return false;
         }
 
+        if ($this->expirationDate !== null) {
+            return $this->expirationDate > new \DateTime();
+        }
+
         return true;
     }