how to give a restriction of less 4 characters to a case

[Romeo20]

I want to give a case a risctriction of 4 characters, it's going about this case:

case "debiteurnr":
             $query . " = " . $_POST["trefwoord"] . "'";

if i give a strlen

if (strlen($_POST["zoeken"]) < 3) {
echo "Sorry, je zoekopdracht is te kort of niets ingevuld";
}

it also works at the other 2 case's and i don't want that

case "klantnaam":
$query .= " LIKE '%". $POST["trefwoord"] . "'";
break;
case "woonplaats":
$query .= " LIKE '%". $POST["trefwoord"] . "'";
break;
default:
break;

If someone knows how to give a restriction of 4 characters to a case. and not all cases....

Let me know, Thanks..
Romeo

[bastien]

just add it into the case sections's code block like below:

 case "debiteurnr":
 if (strlen($_POST["zoeken"]) < 3) {
echo "Sorry, je zoekopdracht is te kort of niets ingevuld";
 header("location:somepage.php");
 die();
} 

$query . " = " . $_POST["trefwoord"] . "'";
break;

ps: if you're not dutch, you're not much