Change image size in php file

[user25]

How would I edit this to change image size in this line of code

            $logo = "<div class=\"logo\"><img src=\"" . $g['logo'] . "\" alt=\"" . $g['name'] . "\" /></div>";

To make maximum height of 30(px)

[Leefish]

Use css -

.logo img {max-height:30px;}