Hi. PocketMine can set the Skin with setSkin(). But, the setSkin need Binary data. PHP: setSkin($str, $skinName) the $str is not the image file so must be a string. So I created the converter that png image to binary data. You can convert and use the binary for setSkin. http://korado.s602.xrea.com/service/pngconverter-eng.php
is there any way you'll publish the sourc of that converting process? I would be interested in making a /setSkin <PcPlayerName> command
There already exists this. https://github.com/Muirfield/pocketmine-plugins/blob/master/GrabBag/src/aliuly/common/SkinUtils.php