[Nero_3D]

No clue, could be anything, but adding other strcmp commands like that should work

PHP Code:

//
    if(strcmp(cmdtext, "/hello1", true) == 0) {
        return SendClientMessage(playerid, -1, "Hello1");
    }
    if(strcmp(cmdtext,"/fb", true, 3) == 0 && cmdtext[3] <= ' ') {
        if(cmdtext[3] == EOS || cmdtext[4] == EOS) {
            return SendClientMessage(playerid, -1, "/fb <car id>");
        }
        if(DestroyVehicle(strval(cmdtext[4])) == 0) {
            return SendClientMessage(playerid, -1, "Invalid vehicleid!");
        }
        return SendClientMessage(playerid, -1, "Vehicle destroyed!");
    }
    if(strcmp(cmdtext, "/hello2", true) == 0) {
        return SendClientMessage(playerid, -1, "Hello2");
    } 


if /hello1 and /hello2 is working that the problem is within your code

So if your other commands are also strcmp based they should work