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Код

public function create_thumb($file_name = '')
    {
        $this->set_thumb_parameters(150);
        $array = $this->detect_type_functions();
        $new_image = imagecreatetruecolor($this->thumb_width, $this->thumb_height);
        $img = $array['function_f']($this->file_name);
        $r = imagecopyresampled($new_image, $img, 0, 0, 0, 0, $this->thumb_width, $this->thumb_height, $this->width, $this->height);
        
        if (empty($file_name))
        {
            header('Content-type: ' . $array['header']);
            $array['function_s']($new_image);
        }
        else
        {
            $array['function_s']($new_image, $file_name);
            imagedestroy($new_image);
        }
    }

protected function detect_type_functions()
    {
        if (!file_exists($this->file_name))
        {
            return false;
        }
        
        $return_array = array();
        
        switch ($this->extension)
        {
            case 'jpg': 
                $return_array['header'] = 'image/jpeg';
                $return_array['function_f'] = 'imagecreatefromjpeg';
                $return_array['function_s'] = 'imagejpeg';
                break;
                
            case 'png':
                $return_array['header'] = 'image/png';
                $return_array['function_f'] = 'imagecreatefrompng';
                $return_array['function_s'] = 'imagepng';
                break;                
                
            case 'gif':
                $return_array['header'] = 'image/gif';
                $return_array['function_f'] = 'imagecreatefromgif'; 
                $return_array['function_s'] = 'imagegif';
                break;
                
            default:
                $return_array['header']        = '';
                $return_array['function_f'] = '';
                $return_array['function_s'] = '';
                break;
        }
        
        return $return_array;
        
    }