elFinder\elFinderVolumeDriver::imgResize PHP Method

    protected function imgResize($path, $width, $height, $keepProportions = false, $resizeByBiggerSide = true, $destformat = null)
    {
        if (($s = @getimagesize($path)) == false) {
            return false;
        }
        $result = false;
        list($size_w, $size_h) = array($width, $height);
        if ($keepProportions == true) {
            list($orig_w, $orig_h, $new_w, $new_h) = array($s[0], $s[1], $width, $height);
            /* Calculating image scale width and height */
            $xscale = $orig_w / $new_w;
            $yscale = $orig_h / $new_h;
            /* Resizing by biggest side */
            if ($resizeByBiggerSide) {
                if ($orig_w > $orig_h) {
                    $size_h = $orig_h * $width / $orig_w;
                    $size_w = $width;
                } else {
                    $size_w = $orig_w * $height / $orig_h;
                    $size_h = $height;
                }
            } else {
                if ($orig_w > $orig_h) {
                    $size_w = $orig_w * $height / $orig_h;
                    $size_h = $height;
                } else {
                    $size_h = $orig_h * $width / $orig_w;
                    $size_w = $width;
                }
            }
        }
        switch ($this->imgLib) {
            case 'imagick':
                try {
                    $img = new imagick($path);
                } catch (Exception $e) {
                    return false;
                }
                $img->resizeImage($size_w, $size_h, Imagick::FILTER_LANCZOS, true);
                $result = $img->writeImage($path);
                return $result ? $path : false;
                break;
            case 'gd':
                $img = self::gdImageCreate($path, $s['mime']);
                if ($img && false != ($tmp = imagecreatetruecolor($size_w, $size_h))) {
                    self::gdImageBackground($tmp, $this->options['tmbBgColor']);
                    if (!imagecopyresampled($tmp, $img, 0, 0, 0, 0, $size_w, $size_h, $s[0], $s[1])) {
                        return false;
                    }
                    $result = self::gdImage($tmp, $path, $destformat, $s['mime']);
                    imagedestroy($img);
                    imagedestroy($tmp);
                    return $result ? $path : false;
                }
                break;
        }
        return false;
    }