php upload and array

[jman11]

ok i have an upload form that uploads images to a directory, but what i want to do is when it uploads, it ads the image name to the array, with array push, it works fine for 1 image, i use array_push, but once it submits and shows that its in there, i try and upload another image again right after, and then when it ads that one to the array, it deletes the previous image name off the array. idk how to keep the imagename in the array for both. any ideas? heres a snippet of what ive got:

$images = array();
//if isset submit and other error checking here
 if ($_FILES["file"]["error"] > 0)
 {
 echo "Return Code: " . $_FILES["img"]["error"] . "<br />";
 }
 else
 {
move_uploaded_file($_FILES["img"]["tmp_name"],"upload/" . $img);
array_push($images,$img);
 }
print_r($images);

[too much information]

Why not just use:

$images[] = $img;