return false early from directory resource

Author: robfrawley

Resource/DirectoryResource.php

@@ -68,7 +68,10 @@ public function isFresh($timestamp)
             return false;
         }
 
-        $newestMTime = filemtime($this->resource);
+        if ($timestamp <= filemtime($this->resource)) {
+            return false;
+        }
+
         foreach (new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($this->resource), \RecursiveIteratorIterator::SELF_FIRST) as $file) {
             // if regex filtering is enabled only check matching files
             if ($this->pattern && $file->isFile() && !preg_match($this->pattern, $file->getBasename())) {
@@ -81,10 +84,13 @@ public function isFresh($timestamp)
                 continue;
             }
 
-            $newestMTime = max($file->getMTime(), $newestMTime);
+            // early return if a file's mtime exceeds the passed timestamp
+            if ($timestamp <= $file->getMTime()) {
+                return false;
+            }
         }
 
-        return $newestMTime < $timestamp;
+        return true;
     }
 
     public function serialize()