[PHP-NOTES] note 130219 added to function.imagescale

To resize height without specifying a width you can rotate the image by 90 degrees, resize, then rotate by 270 degrees.

        $outputImage = imagerotate($image, 90, 0);
        $outputImage = imagescale($outputImage, $minSize);
        $outputImage = imagerotate($outputImage, 270, 0);
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