static function edit()
{
$img_name = post('img_name', 'title');
list($width, $height) = getimagesize($img_name);
$p_width = post('p_w', 'int');
$p_height = post('p_h', 'int');
//先缩放
$res = imagecreatetruecolor($p_width, $p_height);
$img = img::open($img_name);
imagecopyresampled($res, $img, 0, 0, 0, 0, $p_width, $p_height, $width, $height);
img::clear($img);
//再裁切
$new_img = imagecreatetruecolor(post('n_w', 'int'), post('n_h', 'int'));
imagecopyresampled($new_img, $res, 0, 0, post('t_x', 'int'), post('t_y', 'int'), $p_width, $p_height, $p_width, $p_height);
$img_name = basename($img_name);
img::save($new_img, $img_name, dc_file_create);
http::json(array('error' => 0, 'info' => $img_name), true);
}