PHP类1

<?php

	class ShopProduct {
		public $title = "default product";
		public $producerMainName = "main name";
		public $producerFirstName = "first name";
		public $price = 0;

		function getProducer() {
			return "{$this->producerFirstName}" . " {$this->producerMainName}";
		}
	}

	$product1 = new ShopProduct();
	$product1->title = "My Antonia";
	$product1->producerMainName = "Cather";
	$product1->producerFirstName = "Willa";
	$product1->price = 5.99;

	print "author: {$product1->getProducer()}";
?>

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<?php
	
	class ShopProduct {
		public $title;
		public $producerMainName;
		public $producerFirstName;
		public $price = 0;

		function __construct($title,$firstName,$mainName,$price) { //构造方法
			$this->title = $title;
			$this->producerFirstName = $firstName;
			$this->producerMainName = $mainName;
			$this->price = $price;
		}

		function getProducer() {
			return "{$this->producerFirstName}" . " {$this->producerMainName}";
		}
	}

	$product1 = new ShopProduct( "My Antionia", "willa", "Cather", 5.99);
	print "author: {$product1->getProducer()}";
?>

上面把之前的初始化功能集成到类中，以减少代码的重复。当使用new操作符创建对象时，__construct()方法会被调用。

摘录于：《深入PHP面向对象、模式与实践》