七夕最污代碼，單身慎入

充滿濃濃感情的兩段代碼。 1.牛郎織女和牛 2.說不出的愛 讀懂之後，你有什麼感想？

1.牛郎織女和牛的故事，請問他們做了什麼？

<?php
class Biology {
    public function say ($word) {
        echo $word,"\n";
    }
}

// 牛
class Niu extends Biology{
}


// 牛郎
class Niulang extends Biology{
    public function shangQiao($niu) {
        echo "騎牛上橋\n";
    }

    public function xiaQiao($niu) {
        echo "騎牛下橋\n";
    }
}

// 織女
class Zhinv extends Biology{
    public function shangQiao() {
        echo "織女上橋\n";
    }

    public function xiaQiao() {
        echo "織女下橋\n";
    }
}

//橋
class Qiao {
    public function isOk() {
        return '77' == date('md');
    }
}

// 牛郎織女開污撒狗糧
class SaGouLiang {

    private $niulang;
    private $zhinv;
    private $niu;
    private $qiao;

    public function __construct() {
        $this->niulang = new Niulang();
        $this->zhinv = new Zhinv();
        $this->niu = new Niu();
        $this->qiao = new Qiao();
    }

    /**
    * 開灑狗糧
    **/
    public function kaiSa() {
        if (!$this->qiao->isOk()) {
            return;
        }
        $this->niulang->shangqiao($this->niu);
        $this->zhinv->shangqiao();

        while ($this->qiao->isOk()) {
            $this->niulang->say("妮，愛你");
            $this->zhinv->say("郎，想你");
            $this->niu->say("哞哞");
            sleep(3600);
        }

        $this->niulang->xiaqiao($this->niu);
        $this->zhinv->xiaqiao();
    }
}

$nz = new SaGouLiang();
while (true) {
    $nz->kaiSa();
}

2.找不到對象說愛(Fatal error: Call to a member function on a non-object), 他怎麼才能說出愛？

<?php
class Lover {
    public function getName() {
        return "lover";
    }
}

class LoverFacotry {
    public static function getLover($man) {
        return preg_match('/程序員/', $man) ? null : new Lover();
    }
}

class ItMan {
    private $name = 'nginx作者-程序員';
    private $obj;
    public function sayLove() {
        $this->obj = LoverFacotry::getLover($this->name);
        echo sprintf("%s, I Love You!", $this->obj->getName());
    }
}

$man = new ItMan();
$man->sayLove();