rmrevin / yii2-file

     * @param string $filter

     * @return \Imagine\Image\ImageInterface

     */

    public static function resizeByWidth($filename, $width, $filter = Imagine\Image\ImageInterface::FILTER_UNDEFINED)

    {

        $img = static::getImagine()

            ->open(\Yii::getAlias($filename));

        $height = $img->getSize()->getHeight() / $img->getSize()->getWidth() * $width;

        return $img

            ->copy()

            ->resize(new Imagine\Image\Box($width, $height), $filter);

    }

    /**

     * Resize an image by height.

     * @param string $filter

     * @return \Imagine\Image\ImageInterface

     */

    public static function resizeByHeight($filename, $height, $filter = Imagine\Image\ImageInterface::FILTER_UNDEFINED)

    {

        $img = static::getImagine()

            ->open(\Yii::getAlias($filename));

        $width = $img->getSize()->getWidth() / $img->getSize()->getHeight() * $height;

        return $img

            ->copy()

            ->resize(new Imagine\Image\Box($width, $height), $filter);

    }

    /**

     * Strict resize an image.