Image::resize PHP Method

    public function resize($width = 0, $height = 0, $default = '')
    {
        if (!$this->width || !$this->height) {
            return;
        }
        $xpos = 0;
        $ypos = 0;
        $scale = 1;
        $scale_w = $width / $this->width;
        $scale_h = $height / $this->height;
        if ($default == 'w') {
            $scale = $scale_w;
        } elseif ($default == 'h') {
            $scale = $scale_h;
        } else {
            $scale = min($scale_w, $scale_h);
        }
        if ($scale == 1 && $scale_h == $scale_w && $this->mime != 'image/png') {
            return;
        }
        $new_width = (int) ($this->width * $scale);
        $new_height = (int) ($this->height * $scale);
        $xpos = (int) (($width - $new_width) / 2);
        $ypos = (int) (($height - $new_height) / 2);
        $image_old = $this->image;
        $this->image = imagecreatetruecolor($width, $height);
        if ($this->mime == 'image/png') {
            imagealphablending($this->image, false);
            imagesavealpha($this->image, true);
            $background = imagecolorallocatealpha($this->image, 255, 255, 255, 127);
            imagecolortransparent($this->image, $background);
        } else {
            $background = imagecolorallocate($this->image, 255, 255, 255);
        }
        imagefilledrectangle($this->image, 0, 0, $width, $height, $background);
        imagecopyresampled($this->image, $image_old, $xpos, $ypos, 0, 0, $new_width, $new_height, $this->width, $this->height);
        imagedestroy($image_old);
        $this->width = $width;
        $this->height = $height;
    }

 public function resize($filename, $width, $height)
 {
     if (!file_exists(DIR_IMAGE . $filename) || !is_file(DIR_IMAGE . $filename)) {
         return;
     }
     $info = pathinfo($filename);
     $extension = $info['extension'];
     $old_image = $filename;
     $new_image = 'cache/' . utf8_substr($filename, 0, utf8_strrpos($filename, '.')) . '-' . $width . 'x' . $height . '.' . $extension;
     if (!file_exists(DIR_IMAGE . $new_image) || filemtime(DIR_IMAGE . $old_image) > filemtime(DIR_IMAGE . $new_image)) {
         $path = '';
         $directories = explode('/', dirname(str_replace('../', '', $new_image)));
         foreach ($directories as $directory) {
             $path = $path . '/' . $directory;
             if (!file_exists(DIR_IMAGE . $path)) {
                 @mkdir(DIR_IMAGE . $path, 0777);
             }
         }
         $image = new Image(DIR_IMAGE . $old_image);
         $image->resize($width, $height);
         $image->save(DIR_IMAGE . $new_image);
     }
     if (isset($this->request->server['HTTPS']) && ($this->request->server['HTTPS'] == 'on' || $this->request->server['HTTPS'] == '1')) {
         return HTTPS_CATALOG . 'image/' . $new_image;
     } else {
         return HTTP_CATALOG . 'image/' . $new_image;
     }
 }