accessing an element in an array of arrays

PHP Code:

$files_to_upload = Array
(
        [sd1e6fec1] => Array
        (
                [name] => 86.jpg
                [type] => image/jpeg
                [tmp_name] => C:\wamp\tmp\phpFC42.tmp
                [error] => 0
                [size]  => 258177
        )

) 


I am trying to access the size element using this:
$size=$files_to_upload[$name].size;

when I run this I get $size="Arraysize". I am just trying ti get the size element.  How can get that 258177 number?

$name is a string that I got from another structure.

proof that an old dog can learn new tricks