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PHP код:

if(InDMS[playerid] == 1)
{
    SetPlayerHealth(playerid,0.0);
    SendClientMessage(playerid,COLOR_LIGHTGREEN,"You have left the Deathmatch Stadium.");
    format(string,sizeof string,"%s (%d) has left deathmatch Stadium. (/leave)",PlayerInfo[playerid][pName],playerid);
    SendClientMessageToOthers(playerid,COLOR_LIGHTGREEN,N,string);
    InDMS[playerid] = 0;
    SpawnPlayer(playerid);// so or:
    //SetPlayerPos(playerid,1.0,1.0,1.0);//here the coordinates.
} 


You can choose SpawnPlayer(playerid); or direct SetPlayerPos.

# EDIT:
Please delete the other thread which you started.