


1. Intention
Convert the interface of a class into another interface desired by the client. The Adapter mode allows classes that were originally unable to work together due to incompatible interfaces to work together
2. Adapter pattern structure diagram
3. Main characters in adapter mode
Target role: Defines the interface used by the client related to a specific domain. This is what we expect
Source (Adaptee) role: interface that needs to be adapted
Adapter role: Adapt the Adaptee interface and the Target interface; the adapter is the core of this model. The adapter converts the source interface into the target interface. This role is a concrete class
4. Applicable Scenarios of Adapter Mode
1. You want to use an existing class, but its interface does not meet your needs
2. You want to create a reusable class that can work with other unrelated or unforeseen classes
3. You want to use an existing subclass, but it's not possible to subclass each one to match their interface. Object adapter can adapt to its parent class interface (object adapter only)
5. Class Adapter Pattern and Object Adapter
Class adapter: Adapter and Adaptee are inheritance relationships
1. Use a specific Adapter class to match the Target. The result is that when we want to match a class and all its subclasses, the class Adapter will not do the job
2. Allow Adapter to redefine some behaviors of Adaptee, because Adapter is a subset of Adaptee
3. Only introduce an object, no additional pointers are needed to indirectly obtain the adaptee
Object adapter: Adapter and Adaptee are in a delegation relationship
1. Allow one Adapter to work with multiple Adaptee at the same time. Adapter can also add functions to all Adaptees at once
2. It is difficult to redefine the behavior of Adaptee
Adapter pattern and other patterns
Bridge mode (bridge mode): The bridge mode is similar to the object adapter, but the starting point of the bridge mode is different: the purpose of the bridge mode is to separate the interface part and the implementation part, so that they can be changed relatively easily and relatively independently. The object adapter pattern means changing the interface of an existing object
Decorator mode (decorator mode): Decoration mode enhances the functionality of other objects without changing its interface. Decoration mode therefore provides better transparency to the application than adapters.
6. Class Adapter Pattern PHP Example
Class adapters use inheritance
<?php /** * 目标角色 */ interface Target { /** * 源类也有的方法1 */ public function sampleMethod1(); /** * 源类没有的方法2 */ public function sampleMethod2(); } /** * 源角色 */ class Adaptee { /** * 源类含有的方法 */ public function sampleMethod1() { echo 'Adaptee sampleMethod1 <br />'; } } /** * 类适配器角色 */ class Adapter extends Adaptee implements Target { /** * 源类中没有sampleMethod2方法,在此补充 */ public function sampleMethod2() { echo 'Adapter sampleMethod2 <br />'; } } class Client { /** * Main program. */ public static function main() { $adapter = new Adapter(); $adapter->sampleMethod1(); $adapter->sampleMethod2(); } } Client::main(); ?>
7. Object Adapter Pattern PHP Example
The object adapter uses delegation
<?php /** * 目标角色 */ interface Target { /** * 源类也有的方法1 */ public function sampleMethod1(); /** * 源类没有的方法2 */ public function sampleMethod2(); } /** * 源角色 */ class Adaptee { /** * 源类含有的方法 */ public function sampleMethod1() { echo 'Adaptee sampleMethod1 <br />'; } } /** * 类适配器角色 */ class Adapter implements Target { private $_adaptee; public function __construct(Adaptee $adaptee) { $this->_adaptee = $adaptee; } /** * 委派调用Adaptee的sampleMethod1方法 */ public function sampleMethod1() { $this->_adaptee->sampleMethod1(); } /** * 源类中没有sampleMethod2方法,在此补充 */ public function sampleMethod2() { echo 'Adapter sampleMethod2 <br />'; } } class Client { /** * Main program. */ public static function main() { $adaptee = new Adaptee(); $adapter = new Adapter($adaptee); $adapter->sampleMethod1(); $adapter->sampleMethod2(); } } Client::main(); ?>
The above is the code to implement the adapter mode using PHP. There are also some conceptual distinctions about the adapter mode. I hope it will be helpful to everyone's learning.

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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