[Charter]

The $arrval['ID'] doesn't have a value because the $arrval array doesn't have an ID key. With the $arrval array set as follows:

$arrval = array(.01,101,202,303,404,5.05,6.06,7,8.08,9.09,10.1);

It is equivalent to the following:

$arrval = array(0 => .01, 1 => 101, 2 => 202, 3 => 303, 4 => 404, 5 => 5.05, 6 => 6.06, 7 => 7, 8 => 8.08, 9 => 9.09, 10 => 10.1);

You could set the array keys as follows:

$arrval = array("ID_0" => .01, "ID_1" => 101, "ID_2" => 202, "ID_3" => 303, "ID_4" => 404, "ID_5" => 5.05, "ID_6" => 6.06, "ID_7" => 7, "ID_8" => 8.08, "ID_9" => 9.09, "ID_10" => 10.1);

And then do something like:

mysql_query("UPDATE $table SET THEVALUE = ".$arrval['ID_0']);

But then all values in the THEVALUE column would be set to $arrval['ID_0'] (.01 in this case) which probably isn't what you want, so you'd need a WHERE clause.