get lask key in array

[webabolic]

How do I extract the last key in an array?

Array([81110000] => 1 [72310103] => 1 [72310100] => 1 [72990400] => 1 [59991103] => 5 )

I want to extract [59991103] and assign it to a variable

thanks in advance

[Drakla]

$keys = array_keys($myArray);

$lastKey = $keys[ count($keys) -1 ];