[Ebisu]

Here you go, Just an example.
Edit it for youself.

PHP код:

public OnPlayerTakeDamage(playerid, issuerid, Float: amount, weaponid, bodypart)
{
   if (Logged[playerid]==1 && issuerid == INVALID_PLAYER_ID)
    {
            new Float:hp;
            if(weaponid == 54) GetPlayerHealth(playerid, hp), hp+=amount, SetPlayerHealth(playerid, hp);
    }
    return 1;
}