1 
      'imagecreatefromjpeg', 7         'image/png'  => 'imagecreatefrompng' 8     ); 9 10     $output_func_list =array(11 12         'image/jpeg' => 'image/jpeg'13 14     );15 16     //待加水印的图片17     $dst_file = 'psb.jpg';18     $stamp_file = 'stamp.jpg';19 20     $dst_info = getimagesize($dst_file);21     $dst_mime = $dst_info['mime'];22 23     $dst_create_func = $create_func_list[$dst_mime];24     $dst_image = $dst_create_func($dst_file);25 26     $stamp_image = imagecreatefromjpeg($stamp_file);27     $stamp_w = imagesx($stamp_image);28     $stamp_h = imagesy($stamp_image);29 30     //印章位置31     $dst_x = 200;32     $dst_y = 80;33 34     //印章采样位置35     $stamp_area_x = 0;36     $stamp_area_y = 0;37     $stamp_area_w = $stamp_w;38     $stamp_area_h = $stamp_h;39 40     $pct = 25;41     //采样 拷贝 合并42     imagecopymerge($dst_image, $stamp_image, $dst_x, $dst_y, $stamp_area_x,$stamp_area_y , $stamp_area_w,$stamp_area_h , $pct); 43 44     header("content-type:image/jpeg");45     imagejpeg($dst_image);46     imagedestroy($dst_image);47     imagedestroy($stamp_image);