(PHP 3>= 3.0.13, PHP 4 )

imagepng -- Output a PNG image to either the browser or a file


int imagepng ( resource image [, string filename])

The imagepng() outputs a GD image stream (image) in PNG format to standard output (usually the browser) or, if a filename is given by the filename it outputs the image to the file.

$im = imagecreatefrompng ("test.png");
imagepng ($im);

See also imagegif(), imagewbmp(), imagejpeg(), imagetypes().