png2wbmp
Description
int png2wbmp ( string pngname, string wbmpname, int d_height, int d_width, int threshold)Converts the pngname PNG file to WBMP format, and saves it as wbmpname. With the d_height and d_width you specify the height and width of the destination image.
Note: WBMP support is only available if PHP was compiled against GD-1.8 or later.
See also jpeg2wbmp().