About PHP Object-oriented, PHP inheritance code

PHP Object-oriented, PHP inheritance in the relevant operation of PHP is particularly important, this article will explain in detail its related content.

<!--? 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 $this->producermainname;        The Public Function SetDiscount ($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, $f            Irstname, $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, $firstNam            E, $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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