在这个代码示例中，我们将创建一个简单的角色和怪物对战游戏。我们将使用PHP编写一个函数，该函数将模拟战斗回合。请注意，这是一个简化的示例，您可以根据需要扩展和修改它。

```php
<?php

class Character {
public $name;
public $health;
public $attack;
public $defense;

public function __construct($name, $health, $attack, $defense) {
$this->name = $name;
$this->health = $health;
$this->attack = $att;
$this->defense = $defense;
}
}

function battle_round($character, $monster) {
$damage = max(0, $character->attack - $monster->defense);
$monster->health -= $damage;

$damage = max(0, $monster->attk - $character->defense);
$character->health -= $damage;

return [$character, $monster];
}

$character = new Character("Hero", 100, 20, 10);
$monster = new Character("Monster", 100, 15, 5);

whilecharacter->health > 0 &&monster->health > 0) {
list($character, $monster) = battle_round($character, $monster);

echo "Charact: {$->name}, Health: {$character->health}\n";
echo "Monster: {$monster->name},ealth: {$monster->health}\n";
echo "--------------------\n";
}

if ($character->health <= 0) {
echocharacter->name} has lost the battle.\n";
} else {
echo "{$character->name} has won the battle.\n";
}
```

这个代码示例定义了一个`Character`类，用于存储角色的属性（名称、生命值、攻击力和防御力）。`battle_round`函数模拟一个战斗回合，计算角色和怪物之间的伤害，并更新它们的生命值。

在主程序中，我们创建了一个角色和一个怪物实例，并在它们的生命值大于0时持续进行战斗回合。每回合结束后，我们打印出角色和怪物的当前生命值。最后，我们判断胜利者并输出结果。