[PHP] checkboxes

[empty]

Hello;

I want to do that:

  I have two checkboxes:
    if first one is checked assign the value as a;
    if first one is checked assign the value as s;
    if both of them checked assign th value as as
       and insert the result db;

the html code:

...
<tr>
 <td><input type="checkbox" name="val" value="a" /> AAA</td>
</tr>
<tr>
 <td><input type="checkbox" name="val" value="s" /> SSS</td>
</tr>
...


and the PHP code:

$eval='';
if(isset($val)){
   if(isset($val[0]) && isset($val[1])) $eval="as";
   if(isset($val[0]) && !isset($val[1])) $eval="a";
   if(!isset($val[0]) && isset($val[1])) $eval="s";

$sql="insert into maillist (ID, postmeth) values ('$id_no','$eval')";
$result=mysql_query($sql);
if(!$result) echo("ERROR");
}

I can't understand what is wrong;

Thanks everybody....


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