[ZF-7726] Zend_Filter_StringToLower/Upper:

- fluid interface

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@17925 44c647ce-9c0f-0410-b52a-842ac1e357ba

library/Zend/Filter/StringToLower.php

@@ -85,6 +85,7 @@ class Zend_Filter_StringToLower implements Zend_Filter_Interface
         }
 
         $this->_encoding = $encoding;
+        return $this;
     }
 
     /**

library/Zend/Filter/StringToUpper.php

@@ -85,6 +85,7 @@ class Zend_Filter_StringToUpper implements Zend_Filter_Interface
         }
 
         $this->_encoding = $encoding;
+        return $this;
     }
 
     /**