$states = array(
'AL' => array( '350','351','352','353', ),
'AK' => array( '995','996','997','998','999', ),
'AZ' => array( '850','851','852','853','854', ),
...
'WI' => array( '530','531','532', ),
'WY' => array( '820','821','822','823','824', ),
);
?>
Seeing your structure now, I think the problem is that '$state' is not set to a value in the array. Are you picking a State and assigning it to $state before executing this loop? If not, then $states[$state] is undefined which is not an array var.