checking the aspect ratio of an images

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I want to force users to insert landscape rather portrait images. I don't 
want to be too pedantic about it but they do need to have an approximate 4x3 
aspect ratio.

This is my code so far.

$max_height = "500"; // This is in pixels
$max_width = "500"; // This is in pixels

list($width, $height, $type, $w) = 
getimagesize($_FILES['userfile']['tmp_name']);

if($width > $max_width || $height > $max_height)
{

}

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