Online PHP editor | output for Tt9tF

<?php # The blueprint for designing creatures for your game interface LivingBeing { public function dealDamage(LivingBeing $opponent); public function takeDamage(int $damage); } interface Race { public function raceName(): string; } class Human implements LivingBeing, Race { private $hp = 150; private $offensiveStrength = 30; public function dealDamage(LivingBeing $opponent) { $opponent->takeDamage($this->offensiveStrength); } public function takeDamage(int $opponent) { } public function raceName(): string { return 'Human'; } } class Elf implements LivingBeing, Race { private $hp = 100; private $offensiveStrength = 30; public function dealDamage(LivingBeing $opponent) { $opponent->takeDamage($this->offensiveStrength); } public function takeDamage(int $opponent) { } public function raceName(): string { return 'Elf'; } } class Dwarf implements LivingBeing, Race { private $hp = 300; private $offensiveStrength = 30; public function dealDamage(LivingBeing $opponent) { $opponent->takeDamage($this->offensiveStrength); } public function takeDamage(int $opponent) { } public function raceName(): string { return 'Dwarf'; } } # I am a junior dev, I am just going to write this code class Centaur implements LivingBeing, Race { private $hp = 300; private $offensiveStrength = 30; public function dealDamage(LivingBeing $opponent) { $opponent->takeDamage($this->offensiveStrength); } public function takeDamage(int $opponent) { } public function raceName(): string { return 'Centaur'; } } class Orc implements LivingBeing, Race { private $hp = 300; private $offensiveStrength = 30; public function dealDamage(LivingBeing $opponent) { $opponent->takeDamage($this->offensiveStrength); } public function takeDamage(int $opponent) { } public function raceName(): string { return 'Orc'; } } function listTheirRace (Race ...$list) { $string = ''; foreach ($list as $being) { $string .= $being->raceName() . "\n"; } return $string; } $Adam = new Human; $Lucas = new Elf; $Jack = new Dwarf; # Let's fight! $Gabrielle = new Centaur; $Guthakug = new Orc; echo listTheirRace(...[$Adam, $Lucas, $Jack, $Gabrielle, $Guthakug]);