public OnPlayerCommandText(playerid, cmdtext[])
{
	if (strcmp("/mycommand", cmdtext, true, 10) == 0)
	{
		// Do something here
		return 1;
	}
	return 0;
}

public OnPlayerInfoChange(playerid)
{
if (strcmp(cmdtext, "/lock", true)==0)
	{
		if(IsPlayerInAnyVehicle(playerid))
		{
			State=GetPlayerState(playerid);
			if(State!=PLAYER_STATE_DRIVER)
			{
				SendClientMessage(playerid,COLOR_GREY,"You can only lock the doors as the driver.");
				return 1;
			}
			new i;
			for(i=0;i<MAX_PLAYERS;i++)
			{
				if(i != playerid)
				{
					SetVehicleParamsForPlayer(GetPlayerVehicleID(playerid),i, 0, 1);
				}
			}
			SendClientMessage(playerid, COLOR_GREY, "Vehicle locked!");
			GetPlayerPos(playerid,X,Y,Z);
			PlayerPlaySound(playerid,1056,X,Y,Z);
		}
		else
		{
			SendClientMessage(playerid, COLOR_GREY, "You're not in a vehicle!");
		}
	return 1;
	}