function addUnit(Unit $unit)
{
array_push($this->units, $unit);
}
function addArmy(Army $army)
{
array_push($this->armies, $army);
}
function bombardStrength()
{
$ret = 0;
foreach ($this->units as $unit) {
$ret += $unit->bombardStrength();
}
foreach ($this->armies as $army) {
$ret += $army->bombardStrength();
}
return $ret;
}
}
$unit1 = new Archer();
$unit2 = new LaserCannonUnit();
$army = new Army();
$army->addUnit($unit1);
$army->addUnit($unit2);
print $army->bombardStrength();
print "\n";
$army2 = clone $army;
$army->addArmy($army2);
print $army->bombardStrength();
print "\n";