[diego200052]

You can use the function strcat to add the clan tag until check if the player is online.

Example:

PHP код:

new clantag[40] = "[LOK]";
strcat(clantag, GetPName(playerto)); 


I make a function to seach by string playername:

PHP код:

forward PlayerIsConnectedS(string[]);
public PlayerIsConnectedS(string[])
{
    new nombre[MAX_PLAYER_NAME];
    for(new i=0;i<GetPlayerPoolSize();i++)
    {
        if(IsPlayerConnected(i) && !IsPlayerNPC(i))
        {
            GetPlayerName(i, nombre, sizeof(nombre));
            if(!strcmp(nombre, string))
                return true;
        }
    }
    return false;
} 


Then you can use

PHP код:

if(!PlayerIsConnectedS(clantag)) return SendClientMessage(playerid, COLOR_WHITE1,"The player not connected."); 


Note: Function IsPlayerConnected only accept playerid in params not string.