PHP Drawing first to confirm whether the GD library is enabled, to the php.ini file, find Extension=php_gd2.dll will be in front of, remove, restart the server.
If you still do not see the normal picture in the drawing, the server replies to the request, the picture information is wrong, to ensure that you do not have anything in front, including HTML.
In addition to the picture, in the drawing cleared cache (that is, before writing the header), first write Ob_clean (); Then it can be displayed (including when writing a file download, the download will not open the file, you also need to clear the cache).
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