[[MG]Dimi]

It's possible. FOr delete cars use loop to scroll through all cars.

PHP код:

#include <a_samp>
public OnPlayerCommandText(playerid,cmdtext[])
{
    if(strcmp("/delcars",cmdtext,true) == 0)
    {
        if(IsPlayerAdmin(playerid))
        {
            SendClientMessage(playerid,0xFF0000FF,"You have deleted all cars on server!");
            for(new i;i<MAX_VEHICLES;i++)
            DestroyVehicle(i);
            return 1;
        }
        return 1;
    }
    return 0;
} 


This should work