CS.

src/DependencyInjection/Builder/ClassFilterBuilder.php

@@ -71,7 +71,7 @@ class ClassFilterBuilder
         }
 
         $hash = sha1(serialize($filters));
-        if (!array_key_exists($hash, $this->filters)) {
+        if (!\array_key_exists($hash, $this->filters)) {
             return $this->filters[$hash] = $this->doBuild("irstea.plant_uml.filters.$hash", $filters);
         }