WordPress: Show Custom Image Sizes in Admin Media Uploader

function show_image_sizes( $sizes ) {
	
  $new_sizes = array();
	
  $added_sizes = get_intermediate_image_sizes();
	
  // $added_sizes is an indexed array, therefore need to convert it
  // to associative array, using $value for $key and $value
  foreach( $added_sizes as $key => $value ) {
    $new_sizes[$value] = $value;
	}
	
  // This preserves the labels in $sizes, and merges the two arrays
  $new_sizes = array_merge( $new_sizes, $sizes );
	
  return $new_sizes;
}
add_filter( 'image_size_names_choose', 'show_image_sizes', 11, 1 );