[Variable™]

You must do it like that.

Код:

public OnPlayerTakeDamage(playerid, issuerid, Float: amount, weaponid, bodypart)
{
    if(issuerid != INVALID_PLAYER_ID && weaponid == 34 && bodypart == 9)
    {
        SetPlayerHealth(playerid, 0);
        GameTextForPlayer(issuerid,"~r~Headshot",2000,3) && GameTextForPlayer(playerid,"~r~Headshot",2000,3);
        PlayerPlaySound(playerid, 17802, 0.0, 0.0, 0.0)  && PlayerPlaySound(issuerid, 17802, 0.0, 0.0, 0.0);
        SetPlayerHealth(playerid, 0.0); 
    }
    return 1;
}

So when you headshoot someone with sniper he dies.