07c03-1.php

介绍PHP5的给类型函数应用

<?php
// Define our class for Compact disks
class cd {
	// Declare variables (properties)
	public $artist;
	public $title;
	protected $tracks;
	private $disk_id;
	
	// Declare the constructor
	public function __construct() {
		// Generate a random disk_id
		$this->disk_id = sha1('cd' . time() . rand());
	}

	// Create a method to return the disk_id, it can't be accessed directly
	// since it is declared as private.
	public function get_disk_id() {
		return $this->disk_id;
	}
}

// Instantiate an object of class 'cd'.
$mydisk = new cd();

// Now use the provided function to retrieve, and display, the id
echo '<p>The compact disk ID is: ', $mydisk->get_disk_id(), '</p>';
?>