PHP图片处理程序。需要GD2或以上版本。包括验证码，文字/图片水印，生成缩略图以及水印位置设置。支持中文，但需要自行添加ttf文件-PHP image processing procedures. Need GD2 or above. Including the verification code, text/image watermark, generating thumbnails and watermark position. To support the Chinese, but ne