(PHP 4 >= 4.0.1, PHP 5)
imagewbmp — Output image to browser or file
imagewbmp() outputs or save a WBMP version of the given image .
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
The path to save the file to. If not set or NULL, the raw image stream will be outputted directly.
You can set the foreground color with this parameter by setting an identifier obtained from imagecolorallocate(). The default foreground color is black.
如果成功則回傳 TRUE,失敗則回傳 FALSE。
Note: WBMP support is only available if PHP was compiled against GD-1.8 or later.