amf php not returning multidimention array

I have been working on a project using AMFPHP and flash. I did the php stuff only. A function in amf that gets result from 3 tables and store their results in 1 array and returns was working perfectly but for a few days it has stopped. The strange thing is that if I return results separately they work but the final array is never returned and am unable to see any response from AMFPHP call in its test browser.

in the code i have mentioned that every point is getting proper result from DB and have tested that from that its retuning result properly.

Another thing seems strange is that the partial results I return comes fine but at he start and end thier is something that is not for other functions which are working:

(mx.collections::ArrayCollection)#0
  filterFunction = (null)
  length = 6
  list = (mx.collections::ArrayList)#1
    length = 6
    source = (Array)#2

RESULT

uid = "8BEDEF32-4BED-E1A4-56A0-F227EDD40026"
  sort = (null)
  source = (Array)#2

here is the function

function getDefaultValuesForAvatarsLocal($jockey_type=NULL){
        $defaultValues = array();
        $sql = "SELECT * FROM default_values";
        $defaultBLValues = $this->db->query($sql);
        $numRows = $this->db->num_rows($defaultBLValues);
        if($numRows > 0){
            $defaultValues['BLP'] = $defaultBLValues; /* IF RETURN THIS GETS RESULT */
            if($jockey_type){
                $sql = "SELECT jockey_clothing_categories.type, jockey_clothing_items.* FROM jockey_clothing_items 
                        JOIN jockey_clothing_categories
                        ON(jockey_clothing_items.category_id = jockey_clothing_categories.id)
                        WHERE jockey_clothing_items.is_default = 1 AND jockey_clothing_items.jockey_type = ". $jockey_type;
                $defaultJockeyClothings = $this->db->query($sql);
                $numRows = $this->db->num_rows($defaultJockeyClothings);
            }
            if($numRows>0){
                if($jockey_type){
                    $defaultValues['DJC'] = $defaultJockeyClothings; /* IF RETURN THIS GETS RESULT */
                }
                $sql = "SELECT horse_avatar_clothings_categories.type, horse_avatar_clothings_items.* FROM horse_avatar_clothings_items 
                        JOIN horse_avatar_clothings_categories
                        ON(horse_avatar_clothings_items.category_id = horse_avatar_clothings_categories.id)
                        WHERE horse_avatar_clothings_items.is_default = 1";
                $defaultHorseClothings = $this->db->query($sql);
                $numRows = $this->db->num_rows($defaultHorseClothings);
                if($numRows>0){
                    $defaultValues['DHC'] = $defaultHorseClothings; /* IF RETURN THIS GETS RESULT */
                    #return $defaultValues; /* NOT RETUNING THE FINAL ARRAY FROM THIS POINT EITHER */
                }else{
#                   return false;
                }
            }else{
#               return false;               
            }
            #return 1333;
            /* THE CONTROL COMES HERE PROPERLY BUT NOT RETUNING THE BELOW ARRAY BUT IS RETUNING ANY TEST TEXT
                LIKE return "I AM HERE"; WILL RETURN THE TEXT PROPERLY
            */
            return $defaultValues;
        }else{
            return false;
        }
    }

Any help would be appreciated Reagrds