[GNGification]

Try something like this

NOTE: Havent tested + im using phone at school
if it doesnt work atleast you can understand the idea

Код:

if (strcmp("/stopradio", cmdtext, true, 10) == 0)
{
     if(Radio[playerid] = 1)
     {
           StopAudioStreamForPlayer(playerid) && SendClientMessage(playerid, COLOR_RED, "You have turned off  the radio.");
           return 1;
     }