Okay most php stuff doesnt faze me and the ones that do i usually find the answer to with the follorwing exception. Task: I am looking at creating sockets for sending/recieving info. In this case RCON commands to a game server. I have come across a script that do what i need but am confused as to the following bit $send = chr (0xFF) . chr (0xFF) . chr (0xFF) . chr (0xFF) . "rcon " . chr (0x00);//Some details ommited $resp = "/\xFF\xFF\xFF\xFFprint\x0A/"; Code (markup): Question: What are the chr (0xFF) and "/\xFF\xFF\xFF\xFFprint\x0A/" for? what function they perform. I understand they are ascii charcter,unsure which ones though, but unsure what they represent and more important why the do. Can any one enlighten me or provide a tutorial on this aspect of programming. Many Thanks