講解PHP物件導向，PHP繼承相關代碼

PHP物件導向，PHP繼承在php的相關操作中顯得尤為重要，本文將會詳細的講解其相關的內容。

<!--?php    class ShopProduct {        private $title;        private $producerMainName;        private $producerFirstName;        protected $price;        private $discount = 0;        public function __construct($title, $firstName, $mainName, $price) {            $this--->title = $title;            $this->producerFirstName = $firstName;            $this->producerMainName = $mainName;            $this->price = $price;        }        public function getProducerFirstName() {            return $this->producerFirstName;        }        public function getProducerMainName() {            return $this->producerMainName;        }        public function setDiscount($num) {            $this->discount = $num;        }        public function getDiscount() {            return $this->discount;        }        public function getTitle() {            return $this->title;        }        public function getPrice() {            return ($this->price - $this->discount);        }        public function getProducer() {            return "{$this->producerFirstName}" . " {$this->producerMainName}";        }        public function getSummaryLine() {            $base = "{$this->title} ( {$this->producerMainName}, ";            $base .= "{$this->producerFirstName) }";            return $base;        }    }    class CdProduct extends ShopProduct {        private $playLength = 0;        public function __construct($title, $firstName, $mainName, $price, $playLength) {            parent::__construct($title,$firstName,$mainName,$price);            $this->playLength = $playLength;        }        public function getPlayLength() {            return $this->playLength;        }        public function getSummaryLine() {            $base = parent::getSummaryLine();            $base .= ": playing time - {$this->playLength}";            return $base;        }    }    class BookProduct extends ShopProduct {        private $numPages = 0;        public function __construct($title,$firstName,$mainName,$price,$numPages) {            parent::__construct($title,$firstName,$mainName,$price);            $this->number=$numPages;        }

public function getNumberOfPages() {            return $this->numPages;        }        public function getSummaryLine() {            $base = parent::getSummaryLine();            $base .= ": page count - {$this->numPages}";            return $base;        }        public function getPrice() {            return $this->price;        }    }?>

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