<?php    class SportObject{                public $name;        public $height;        public $avirdupois;                public function __construct($name, $height,$avirdupois) {            $this->name = $name;            $this->height = $height;            $this->avirdupois = $avirdupois;        }                function beatBasketball() {                        if ($this->height > 180 and $this->avoirdupois <= 100) {                return $this->name.", 符合打篮球的要求。";            } else {                return $this->name.", 不符合打篮球的要求。";            }        }        function showMe(){            echo ‘这句话不会显示。‘;        }        function __destruct() {            echo "<p><b>对象被销毁，调用析构函数。</b></p>";        }    }        class BeatBasketBall extends SportObject{        public $age;                function __construct($name, $height, $age) {            $this->name = $name;            $this->height = $height;            $this->age = $age;        }        function showMe() {            if ($this->age > 18) {                return $this->name.",符合打篮球的要求.";            } else {                return $this->name.",不符合打篮球的要求.";            }        }    }        class WeightLifting extends SportObject {        function showMe() {            if ( $this->avoirdupois < 85) {                return $this->name.",符合举重.";             } else {                return $this->name.",不符合举重.";             }        }    }        $sport1 = new SportObject(‘流星‘, ‘185‘, ‘80‘);    echo $sport1->beatBasketball();    echo "<br>";    $sport2 = new SportObject(‘天飞‘, ‘185‘, ‘80‘);    echo $sport2->beatBasketball();    echo "<br>";    $Basketball = new BeatBasketBall(‘明日‘,‘190‘, ‘68‘);    $weightlifting = new WeightLifting(‘科技‘, ‘185‘, ‘80‘, ‘20‘,‘男‘);    echo "<br>";    echo $Basketball->showMe();    echo "<br>";    echo $weightlifting->showMe();    echo "<br>";        class BookObject{        const BOOT_TYPE = ‘计算机图书‘;        public $object_name;                function setObjectName($name) {            $this->object_name = $name;        }        function getObjectName(){            return $this->object_name;        }    }    $c_book = new BookObject();    $c_book->setObjectName("PHP类");    #echo BookObject::BOOK_TYPE."->";    echo $c_book->getObjectName();        class C {        function __call($name, $num) {            echo "方法名称: ".$name."<p></p>";            echo "参数存在的个数： ".count($num)."<p></p>";            if (count($num) == 1) {                echo $this->list1($a);            }            if (count($num) == 2) {                echo $this->list2($a, $b);            }        }        public function list1($a) {            return "this is function list1";        }        public function list2($a, $b) {            return "this is function list2";        }    }    echo "<br>";    $a = new C;    $a->listshow(1, 2);    echo "<br>";    $b = new C;    $b->listshow(1);                        ?>