Explain PHP object-oriented, PHP inheritance related code

PHP is object-oriented, and PHP inheritance is particularly important in PHP-related operations. This article will explain its related content in detail.

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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