[Tigerkiller]

or a Simple Veriable

pawn Код:

//Gloabal Veriable
new bool:Spawned[MAX_PLAYERS] = false;

//Under OnPlayerSpawn
if(!Spawned[playerid])
{
    //Your Code goes here
    Spawned[playerid] = true;
}

// OnPlayerDisconnect
Spawned[playerid] = false;