之前一直正常，突然一天发现不显示了，网上找了很多，都没有成功 急，求助
import('ORG.Util.Image');
if (C ( 'VERIFY_IMAGE_TYPE' ) == 'EN') {
Image::buildImageVerify ( 4, 1, 'png', 50, 25 );
} elseif (C ( 'VERIFY_IMAGE_TYPE' ) == 'GB') {
Image::GBVerify ();
}