Rather than making a lengthy function that essentially runs twice (once as width, once as height) I came up with a helpful function that uses variable variables to set a maximum height/width. Hope someone finds this helpful.
function scaleimage($location, $maxw=NULL, $maxh=NULL){
$img = @getimagesize($location);
if($img){
$w = $img[0];
$h = $img[1];
$dim = array('w','h');
foreach($dim AS $val){
$max = "max{$val}";
if(${$val} > ${$max} && ${$max}){
$alt = ($val == 'w') ? 'h' : 'w';
$ratio = ${$alt} / ${$val};
${$val} = ${$max};
${$alt} = ${$val} * $ratio;
}
}
return("<img src='{$location}' alt='image' width='{$w}' height='{$h}' />");
}
}
