Help with if sentence in barcode script

[Lydfreak]

Hi!

 

I have a small problem. Jeg have a script (code128b-1.php) that generates a barcode from a number I write in a textbox. If I don't put a number in this textbox, then the barcode script still make a barcode that contains no data.

 

How can I make a if-sentence that check if the variable $datatoencode1 is empty, and in case it is empty, then it will use the picture nullimage.png. Else I want to use the barcode that the script gives me.

 

Code:

 

<?php
$datatoencode1 = $_POST['datatoencode1'];
?>
<img src = "code128b-1.php?D=<?php echo $datatoencode1 ?>">

[Barand]

if (empty($datatoencode1))

    echo "<img src='default.png'>";

else

    echo "<img src='code128b-1.php?D=$datatoencode1'>";

[Lydfreak]

if (empty($datatoencode1))
    echo "<img src='default.png'>";
else
    echo "<img src='code128b-1.php?D=$datatoencode1'>";

Thank you! That really helped