Imagick Resize

imagickResize.php

function imagickResize($uploadDir, $fileFrom, $fileTo, $newWidth, $newHeight)
    {

        $thumb = new Imagick();
        $thumb->readImage($uploadDir. $fileFrom);
        $dimensions = $thumb->getImageGeometry();

        $orginalWidth = $dimensions['width'];
        $orginalHeight = $dimensions['height'];

        $ratio = $orginalWidth/$orginalHeight;

        if ($orginalWidth < $newWidth || $orginalHeight < $newHeight)
        {
            return  '';
        }
        else if ($newWidth/$newHeight > $ratio)
        {
            $newWidth = $newHeight * $ratio;
        }
        else
        {
            $newHeight = $newWidth / $ratio;
        }


        $thumb->resizeImage($newWidth, $newHeight, Imagick::FILTER_LANCZOS,1);
        $thumb->writeImage($uploadDir.$fileTo);
        $thumb->clear();
        $thumb->destroy();

        return $fileTo;
    }