本文實(shí)例講述了PHP設(shè)計(jì)模式之適配器模式原理與用法。分享給大家供大家參考，具體如下：
一、什么是適配器模式
適配器模式有兩種：類適配器模式和對(duì)象適配器模式。其中類適配器模式使用繼承方式，而對(duì)象適配器模式使用組合方式。由于類適配器模式包含雙重繼承，而PHP并不支持雙重繼承，所以一般都采取結(jié)合繼承和實(shí)現(xiàn)的方式來(lái)模擬雙重繼承，即繼承一個(gè)類，同時(shí)實(shí)現(xiàn)一個(gè)接口。類適配器模式很簡(jiǎn)單，但是與對(duì)象適配器模式相比，類適配器模式的靈活性稍弱。采用類適配器模式時(shí)，適配器繼承被適配者并實(shí)現(xiàn)一個(gè)接口；采用對(duì)象適配器模式時(shí)，適配器使用被適配者，并實(shí)現(xiàn)一個(gè)接口。
二、什么時(shí)候使用適配器模式
適配器模式的作用就是解決兼容性問(wèn)題，如果需要通過(guò)適配（使用多重繼承或組合）來(lái)結(jié)合兩個(gè)不兼容的系統(tǒng)，那就使用適配器模式。
三、類適配器模式
以貨幣兌換為例：
<?php/*** 類適配器模式* 以貨幣兌換為例**///美元計(jì)算類class DollarCalc{ private $dollar; private $product; private $service; public $rate = 1; public function requestCalc($product,$service) { $this->product = $product; $this->service = $service; $this->dollar = $this->product + $this->service; return $this->requestTotal(); } public function requestTotal() { $this->dollar *= $this->rate; return $this->dollar; }}//歐元計(jì)算類class EuroCalc{ private $euro; private $product; private $service; public $rate = 1; public function requestCalc($product,$service) { $this->product = $product; $this->service = $service; $this->euro = $this->product + $this->service; return $this->requestTotal(); } public function requestTotal() { $this->euro *= $this->rate; return $this->euro; }}//歐元適配器接口interface ITarget{ function requester();}//歐元適配器實(shí)現(xiàn)class EuroAdapter extends EuroCalc implements ITarget{ public function __construct() { $this->requester(); } function requester() { $this->rate = .8111; return $this->rate; }}//客戶類class Client{ private $euroRequest; private $dollarRequest; public function __construct() { $this->euroRequest = new EuroAdapter(); $this->dollarRequest = new DollarCalc(); $euro = ""; echo "Euros: $euro" . $this->makeAdapterRequest($this->euroRequest) . "<br />"; echo "Dollars: $" . $this->makeDollarRequest($this->dollarRequest); } private function makeAdapterRequest(ITarget $req) { return $req->requestCalc(40,50); } private function makeDollarRequest(DollarCalc $req) { return $req->requestCalc(40,50); }}$client = new Client();?>運(yùn)行結(jié)果：
Euros: 72.999
Dollars: $90
四、對(duì)象適配器模式
以桌面環(huán)境轉(zhuǎn)向移動(dòng)環(huán)境為例：
<?php/*** 對(duì)象適配器模式* 從桌面環(huán)境轉(zhuǎn)向移動(dòng)環(huán)境**///桌面布局接口interface IFormat{ public function formatCSS(); public function formatGraphics(); public function horizontalLayout();}//桌面布局類實(shí)現(xiàn)class Desktop implements IFormat{ public function formatCSS() { //調(diào)用桌面布局CSS文件 } public function formatGraphics() { //調(diào)用圖片 } public function horizontalLayout() { //桌面水平布局 }}//移動(dòng)布局接口interface IMobileFormat{ public function formatCSS(); public function formatGraphics(); public function verticalLayout();}//移動(dòng)布局類實(shí)現(xiàn)class Mobile implements IMobileFormat{ public function formatCSS() { //調(diào)用移動(dòng)布局CSS文件 } public function formatGraphics() { //調(diào)用圖片 } public function verticalLayout() { //移動(dòng)垂直布局 }}//移動(dòng)布局適配器class MobileAdapter implements IFormat{ private $mobile; public function __construct(IMobileFormat $mobile) { $this->mobile = $mobile; } public function formatCSS() { $this->mobile->formatCSS(); } public function formatGraphics() { $this->mobile->formatGraphics(); } public function horizontalLayout() { $this->mobile->verticalLayout(); }}//客戶類class Client{ private $mobile; private $mobileAdapter; public function __construct() { $this->mobile = new Mobile(); $this->mobileAdapter = new MobileAdapter($this->mobile); $this->mobileAdapter->formatCSS(); $this->mobileAdapter->formatGraphics(); $this->mobileAdapter->horizontalLayout(); }}$client = new Client();?>希望本文所述對(duì)大家PHP程序設(shè)計(jì)有所幫助。
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