[Jarnu]

i'll give you an example ONLY:

pawn Код:

public OnPlayerGiveDamage(playerid, damagedid, Float:amount, weaponid)
{
  if(issuerid != INVALID_PLAYER_ID)
  {
       switch(weaponid)
       {
            case 0:
            {
                  new Float:health;
                  GetPlayerHealth(playerid, health);
                  SetPlayerHealth(playerid, health-5);
            }
       } 
   }
   return 1;
}

Just an example