PHP面向对象基础实例

<?php
class marine
{
    public $blood = 50; //剩余的血
    public $kills = 0; //杀敌数量
    static $all_num = 0;//兵的数量
    public $kill_hard = 10;//攻击力
    //这个函数（通常叫做方法）表示攻击敌人时候的运行代码

    //构造函数
    function __construct()
    {
        //增加总人口的代码
        self::$all_num++;
    }

    function attack($enemy)
    {
        //攻击敌人的代码
        $enemy->blood = $enemy->blood -self::$kill_hard;
    }

    //静态函数  升级
    static function up_kill_hard()
    {
        self::$kill_hard+=2;
    }
    //析构函数
    function __destruct()
    {
        //减少总人口的代码
        self::$all_num--;
    }

}

class dog
{
    public $blood = 100; //剩余的血
    public $kills = 0; //杀敌数量
    //这个函数（通常叫做方法）表示攻击敌人时候的运行代码
    function attack($enemy)
    {
        //攻击敌人的代码
    }
}

$m1 = new marine();
echo $m1->blood;
echo $m1->kill_hard;
echo "<hr>";

$m2 = new marine();
$m2->blood = 10;
echo $m2->blood;

echo "<hr>";

$m3 = new marine();
$m3->blood = 13;
echo $m3->blood;

echo "<hr>";

$dog1 = new dog();
$m2->attack($dog1);
echo $dog1->blood;

echo "<hr>";

echo marine::$all_num;

echo "<hr>";

unset($m3);
echo marine::$all_num;

echo "<hr>";

echo marine::$kill_hard;

echo "<hr>";

marine::up_kill_hard();
echo marine::$kill_hard;

echo "<hr>";

?>