Images in Signature - how do you read them?

[Sven]

I'm trying a little hacking on image dimensions and I wonder how they are read in vBulletin.
Is there any variable already existing or how would I start?

Any help is appreciated

[Scott MacVicar]

the getimagesize function

http://php.net/manual/en/function.getimagesize.php

[Sven]

Yes, that's what I already have

But what I need is how vbulletin treats the images in the signature.

I already have:

PHP Code:

<?php $size = GetImageSize ("placebo.gif"); ?>
<?php echo $size[3]; ?>
<?php $height = strstr($size[3], 'height="'); ?>
<?php $hoehe = substr($height, 8, 3);?>
<br><br>
<?php echo $hoehe; ?> Height
<br>
<?php $breite = substr($size[3], 7, 3);?>
<br>
<?php echo $breite; ?> Width

But the missing link is:
What to put instead of "placebo.gif" ???

It's just a very early start and i'm pretty new to php coding...