The answer is yes.
if can be used after
else but they're not joined like you're doing.
PHP Code:
function onPlayerChats() {
if (player.chat == "/reconnect") {
System.reconnect();
player.chat = "";
}
else if (player.chat == "/disconnect") {
System.disconnect();
player.chat = "";
}
else {
player.chat = "ZOMG TEXT";
}
}