[mmrk]

pawn Код:

GetPlayerName(playeird, sendername, sizeof(sendername)); // This is for admin name

And you don't need to send ClientMessageToAll just do:

pawn Код:

SendClientMessage(otherId, 0xFFFFFFAA, string);

pawn Код:

CMD:slap(playerid, params[]) 
{ 
    if(!IsPlayerAdmin(playerid)) return SendClientMessage(playerid, 0xFF4646FF, "You are not authorized to use that command !"); 
    new otherId, sendername[MAX_PLAYER_NAME], string[128];  
    if(sscanf(params, "u", otherId)) return SendClientMessage(playerid, 0xAFAFAFAA, "USAGE: /slap [ID/PartOfname]"); 
    if(otherId == INVALID_PLAYER_ID) return SendClientMessage(playerid, 0xAFAFAFAA, "Invalid Player ID"); 
    { 
        new Float:slx, Float:sly, Float:slz; 
        GetPlayerPos(otherId, slx, sly, slz); 
        SetPlayerPos(otherId, slx, sly, slz+5); 
        PlayerPlaySound(otherId, 1130, slx, sly, slz+5); 
        GetPlayerName(playeird, sendername, sizeof(sendername)); // This is for admin name
        format(string, sizeof(string), "(( You have been slapped by admin %s ))", sendername ); 
        SendClientMessage(otherId, 0xFFFFFFAA, string);
    } 
    return 1; 
}