如何获得子阵列的唯一值？

Actually, I am getting array and subarray. I want to get the unique values from the subarray. I tried many things but it is not working for me. Here is the array value of mine

  Array
(
    [title] => Array
        (
            [0] => Cake Shops,Food,Inexpensive Restaurents,Moderate Restaurants (Rs.400 - Rs.800),Multicuisine Restaurants,Pure Veg Restaurants,Restaurants,Cake Shops,Food,Inexpensive Restaurents,Moderate Restaurants (Rs.400 - Rs.800),Multicuisine Restaurants,Pure Veg Restaurants,Restaurants,Cake Shops,Food,Inexpensive Restaurents,Moderate Restaurants (Rs.400 - Rs.800),Multicuisine Restaurants,Pure Veg Restaurants,Restaurants,Cake Shops,Food,Inexpensive Restaurents,Moderate Restaurants (Rs.400 - Rs.800),Multicuisine Restaurants,Pure Veg Restaurants,Restaurants,Cake Shops,Food,Inexpensive Restaurents,Moderate Restaurants (Rs.400 - Rs.800),Multicuisine Restaurants,Pure Veg Restaurants,Restaurants,Cake Shops,Food,Inexpensive Restaurents,Moderate Restaurants (Rs.400 - Rs.800),Multicuisine Restaurants,Pure Veg Restaurants,Restaurants,Cake Shops,Food,Inexpensive Restaurents,Moderate Restaurants (Rs.400 - Rs.800),Multicuisine Restaurants,Pure Veg Restaurants,Restaurants,Cake Shops,Food,Inexpensive Restaurents,Moderate Restaurants (Rs.,,
            [1] => Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterers,Bakery,Cake Shops,Caterer,,Bakery,Cake Shops,Caterers
            [2] => Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Delivery Restaurants,Home Deliv,,Home Delivery Restaurants
            [3] => ,,,Chocolate Manufacturers,,Chocolate Manufacturers,,Chocolate Manufacturers,,Chocolate Manufacturers,,Chocolate Manufacturers
            [4] => ,,,Chocolate Manufacturers,,Chocolate Manufacturers,,Chocolate Manufacturers
            [5] => 
        )

)

All i want is to get unique data from it and remove the blank value

i tried it like

for($i=0;$i<count($listing);$i++){
        $tags['title'][$i] = $listing[$i]->cat_title;
        $tags['taa'] = array_unique($tags['title'][$i]);
    }
    echo '<pre>';
    print_r($tags);
    echo '</pre>';

In $listing i am getting data from db.