《PHP編程：PHP面向對象程序設計之對象生成方法詳解》要點：
本文介紹了PHP編程：PHP面向對象程序設計之對象生成方法詳解，希望對您有用。如果有疑問，可以聯(lián)系我們。
PHP實例本文實例講述了PHP面向對象程序設計之對象生成方法.分享給大家供大家參考,具體如下：
PHP實例對象
PHP實例看個例子
PHP實例
<?php
abstract class Employee { // 雇員
protected $name;
function __construct( $name ) {
$this->name = $name;
}
abstract function fire();
}
class Minion extends Employee { // 奴隸 繼承 雇員
function fire() {
print "{$this->name}: I'll clear my desk\n";
}
}
class NastyBoss { // 壞老板
private $employees = array();
function addEmployee( $employeeName ) { // 添加員工
$this->employees[] = new Minion( $employeeName ); // 代碼靈活性受到限制
}
function projectFails() {
if ( count( $this->employees ) > 0 ) {
$emp = array_pop( $this->employees );
$emp->fire(); // 炒魷魚
}
}
}
$boss = new NastyBoss();
$boss->addEmployee( "harry" );
$boss->addEmployee( "bob" );
$boss->addEmployee( "mary" );
$boss->projectFails();
// output:
// mary: I'll clear my desk
?>
PHP實例再看一個更具有靈活性的案例
PHP實例
<?php
abstract class Employee {
protected $name;
function __construct( $name ) {
$this->name = $name;
}
abstract function fire();
}
class Minion extends Employee {
function fire() {
print "{$this->name}: I'll clear my desk\n";
}
}
class NastyBoss {
private $employees = array();
function addEmployee( Employee $employee ) { // 傳入對象
$this->employees[] = $employee;
}
function projectFails() {
if ( count( $this->employees ) ) {
$emp = array_pop( $this->employees );
$emp->fire();
}
}
}
// new Employee class...
class CluedUp extends Employee {
function fire() {
print "{$this->name}: I'll call my lawyer\n";
}
}
$boss = new NastyBoss();
$boss->addEmployee( new Minion( "harry" ) ); // 直接以對象作為參數(shù),更具有靈活性
$boss->addEmployee( new CluedUp( "bob" ) );
$boss->addEmployee( new Minion( "mary" ) );
$boss->projectFails();
$boss->projectFails();
$boss->projectFails();
// output:
// mary: I'll clear my desk
// bob: I'll call my lawyer
// harry: I'll clear my desk
?>
PHP實例單例
PHP實例
<?php
class Preferences {
private $props = array();
private static $instance; // 私有的,靜態(tài)屬性
private function __construct() { } // 無法實例化,私有的構造函數(shù)
public static function getInstance() { // 返回對象 靜態(tài)方法才可以被類訪問,靜態(tài)方法中要有靜態(tài)屬性
if ( empty( self::$instance ) ) {
self::$instance = new Preferences();
}
return self::$instance;
}
public function setProperty( $key, $val ) {
$this->props[$key] = $val;
}
public function getProperty( $key ) {
return $this->props[$key];
}
}
$pref = Preferences::getInstance();
$pref->setProperty( "name", "matt" );
unset( $pref ); // remove the reference
$pref2 = Preferences::getInstance();
print $pref2->getProperty( "name" ) ."\n"; // demonstrate value is not lost
?>
PHP實例點評：不能隨意創(chuàng)建對象,只能通過Preferences::getInstance()來創(chuàng)建對象.
PHP實例工廠模式
PHP實例
<?php
abstract class ApptEncoder {
abstract function encode();
}
class BloggsApptEncoder extends ApptEncoder {
function encode() {
return "Appointment data encoded in BloggsCal format\n";
}
}
class MegaApptEncoder extends ApptEncoder {
function encode() {
return "Appointment data encoded in MegaCal format\n";
}
}
class CommsManager { // 負責生產Bloggs對象
function getApptEncoder() {
return new BloggsApptEncoder();
}
}
$obj = new CommsManager();
$bloggs = $obj->getApptEncoder(); // 獲取對象
print $bloggs->encode();
?>
PHP實例output:
PHP實例Appointment data encoded in BloggsCal format
PHP實例進一步增加靈活性設置
PHP實例
<?php
abstract class ApptEncoder {
abstract function encode();
}
class BloggsApptEncoder extends ApptEncoder {
function encode() {
return "Appointment data encoded in BloggsCal format\n";
}
}
class MegaApptEncoder extends ApptEncoder {
function encode() {
return "Appointment data encoded in MegaCal format\n";
}
}
class CommsManager {
const BLOGGS = 1;
const MEGA = 2;
private $mode ;
function __construct( $mode ) {
$this->mode = $mode;
}
function getHeaderText() {
switch ( $this->mode ) {
case ( self::MEGA ):
return "MegaCal header\n";
default:
return "BloggsCal header\n";
}
}
function getApptEncoder() {
switch ( $this->mode ) {
case ( self::MEGA ):
return new MegaApptEncoder();
default:
return new BloggsApptEncoder();
}
}
}
$man = new CommsManager( CommsManager::MEGA );
print ( get_class( $man->getApptEncoder() ) )."\n";
$man = new CommsManager( CommsManager::BLOGGS );
print ( get_class( $man->getApptEncoder() ) )."\n";
?>
PHP實例output:
PHP實例MegaApptEncoder
BloggsApptEncoder
PHP實例工廠方法模式要把創(chuàng)建者類與要生產的產品類分離開來.
PHP實例抽象工廠
PHP實例通過抽象來來約束,成為一定的規(guī)矩.
PHP實例
<?php
abstract class ApptEncoder {
abstract function encode();
}
class BloggsApptEncoder extends ApptEncoder {
function encode() {
return "Appointment data encoded in BloggsCal format\n";
}
}
class MegaApptEncoder extends ApptEncoder {
function encode() {
return "Appointment data encoded in MegaCal format\n";
}
}
abstract class CommsManager { // 預約
abstract function getHeaderText();
abstract function getApptEncoder();
abstract function getTtdEncoder();
abstract function getContactEncoder();
abstract function getFooterText();
}
class BloggsCommsManager extends CommsManager {
function getHeaderText() {
return "BloggsCal header\n";
}
function getApptEncoder() {
return new BloggsApptEncoder();
}
function getTtdEncoder() {
return new BloggsTtdEncoder();
}
function getContactEncoder() {
return new BloggsContactEncoder();
}
function getFooterText() {
return "BloggsCal footer\n";
}
}
class MegaCommsManager extends CommsManager {
function getHeaderText() {
return "MegaCal header\n";
}
function getApptEncoder() {
return new MegaApptEncoder();
}
function getTtdEncoder() {
return new MegaTtdEncoder();
}
function getContactEncoder() {
return new MegaContactEncoder();
}
function getFooterText() {
return "MegaCal footer\n";
}
}
$mgr = new MegaCommsManager();
print $mgr->getHeaderText();
print $mgr->getApptEncoder()->encode(); // 對象調用方法,返回對象,繼續(xù)調用方法.
print $mgr->getFooterText();
?>
PHP實例output:
PHP實例MegaCal header
Appointment data encoded in MegaCal format
MegaCal footer
PHP實例更加牛逼的實現(xiàn)
PHP實例
<?php
// 根據(jù)類圖,規(guī)劃類的代碼.從大局入手.
abstract class ApptEncoder {
abstract function encode();
}
class BloggsApptEncoder extends ApptEncoder {
function encode() {
return "Appointment data encoded in BloggsCal format\n";
}
}
class MegaApptEncoder extends ApptEncoder {
function encode() {
return "Appointment data encoded in MegaCal format\n";
}
}
abstract class CommsManager {
const APPT = 1;
const TTD = 2;
const CONTACT = 3;
abstract function getHeaderText();
abstract function make( $flag_int ); // int標記
abstract function getFooterText();
}
class BloggsCommsManager extends CommsManager {
function getHeaderText() {
return "BloggsCal header\n";
}
function make( $flag_int ) {
switch ( $flag_int ) {
case self::APPT: // self直接控制常量
return new BloggsApptEncoder();
case self::CONTACT:
return new BloggsContactEncoder();
case self::TTD:
return new BloggsTtdEncoder();
}
}
function getFooterText() {
return "BloggsCal footer\n";
}
}
$mgr = new BloggsCommsManager();
print $mgr->getHeaderText();
print $mgr->make( CommsManager::APPT )->encode();
print $mgr->getFooterText();
?>
PHP實例output:
PHP實例BloggsCal header
Appointment data encoded in BloggsCal format
BloggsCal footer
PHP實例原型模式
PHP實例改造成一個保存具體產品的工廠類.
PHP實例
<?php
class Sea {} // 大海
class EarthSea extends Sea {}
class MarsSea extends Sea {}
class Plains {} // 平原
class EarthPlains extends Plains {}
class MarsPlains extends Plains {}
class Forest {} // 森林
class EarthForest extends Forest {}
class MarsForest extends Forest {}
class TerrainFactory { // 地域工廠
private $sea;
private $forest;
private $plains;
function __construct( Sea $sea, Plains $plains, Forest $forest ) { // 定義變量為類對象
$this->sea = $sea;
$this->plains = $plains;
$this->forest = $forest;
}
function getSea( ) {
return clone $this->sea; // 克隆
}
function getPlains( ) {
return clone $this->plains;
}
function getForest( ) {
return clone $this->forest;
}
}
$factory = new TerrainFactory( new EarthSea(),
new EarthPlains(),
new EarthForest() );
print_r( $factory->getSea() );
print_r( $factory->getPlains() );
print_r( $factory->getForest() );
?>
PHP實例output:
PHP實例
EarthSea Object
(
)
EarthPlains Object
(
)
EarthForest Object
(
)
PHP實例更多關于PHP相關內容感興趣的讀者可查看本站專題：《php面向對象程序設計入門教程》、《PHP基本語法入門教程》、《PHP運算與運算符用法總結》、《PHP網(wǎng)絡編程技巧總結》、《PHP數(shù)組(Array)操作技巧大全》、《php字符串(string)用法總結》、《php+mysql數(shù)據(jù)庫操作入門教程》及《php常見數(shù)據(jù)庫操作技巧匯總》
PHP實例希望本文所述對大家PHP程序設計有所幫助.
轉載請注明本頁網(wǎng)址：
http://www.fzlkiss.com/jiaocheng/2524.html
