[[MM]18240[FMB]]

i'll have to test this out. Looks nice.

-EDIT-
This code needs heavy modified. When you shoot the car, the first bullet makes it have -900 HP and the second one repairs it to 1000 HP.. Also doesn't work with Knives, Grenades, and Fists.
-edit-
I found the problem, your math was backwards.

Код:

public OnPlayerWeaponShot(playerid, weaponid, hittype, hitid, Float:fX, Float:fY, Float:fZ)
{
    if(hittype == 2) // verify if the player shoot an vehicle
    {
         new bool: isany_incar = false; // we use a boolean (true/false variable) to check if is anyone in car, and set this to false by default
         for(new i = 0; i < MAX_PLAYERS; i++) // we go through a loop for all players
         {
             if(IsPlayerInVehicle(i, hitid)) // we verify if any player is in the shooted vehicle
             {
                  isany_incar = true; // if a player is in vehicle , then we set our variable to false
                  break; // we break the loop , cause thats mean that a player have been found
             }
         }
         if(isany_incar != true) // we check if the verify from below was false, is noone in the car
         {
              new Float: vHealth; // creating a float variable for getting vehicle health
              GetVehicleHealth(hitid, vHealth); // getting the hitid vehicle

              SetVehicleHealth(hitid, vHealth-40);  // removing 100 from the vehicle health, its not necesary to be 100, you can make a system based on weapon cause unfortunately there is no damage paramater in this callback
         }
    }
    return 1;
}