Outputs or saves a PNG image from the given
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
The path to the saved file. If not set or NULL, the raw image stream will be outputed directly.
Note: NULL is invalid if the
filtersarguments are not used.
Compression level: from 0 (no compression) to 9.
Allows reducing the PNG file size. It is a bitmask field which may be set to any combination of the PNG_FILTER_XXX constants. PNG_NO_FILTER or PNG_ALL_FILTERS may also be used to respectively disable or activate all filters.