讓HTML的一個Option取多個數值

front_end.php

<!-- put values for each options like -->

<SELECT NAME="val">
   <OPTION VALUE="1" value="1:2:3:4"> 1-4  
   <OPTION VALUE="2" value="5:6:7:8"> 5-8  
   <OPTION VALUE="3" value="9:10:11:12"> 9-12
</SELECT>

server_end.php

<?php

//at server side in case of php, use functions like 
//explode [array] = explode([delimeter],[posted value]);

$values = explode(':',$_POST['val']);
$values[0];
$values[1];
//etc.

//the above code return an array have only the numbers 
//and the ':' get removed

?>