arrays and same index

Hi! I want to create an array that looks like follows: $array["untitled_1.jpg"][] = 0 $array["untitled_1.jpg"][] = 3 $array["untitled_1.jpg"][] = 4 $array["untitled_2.jpg"][] = 0 $array["untitled_3.jpg"][] = 1 What I'm thinking about is accessing all "untitled_1.jpg" values by doing the following: $newarray = $array["untitled_1.jpg"]; and receive an array with 3 indexes which has the values 0,3,4... This doesn't works... $array["untitled_1.jpg"][] = 3 seems to overwrite $array["untitled_1.jpg"][] = 0 and then $array["untitled_1.jpg"][] = 4 overwrites $array["untitled_1.jpg"][] = 3... How should I solve this? Sincerely Victor