面向对象 对象概念是面向对象技术的核心。在显示世界里我们所面对的事情都是对象,如计算机、电视机、自行车等。在面向对象的程序设计中,对象是一个由信息及对信息进行处理的描述所组成的整体,是对现实世界的抽象.
对象的主要三个特性
对象的行为:可以对 对象施加那些操作,开灯,关灯就是行为。
对象的形态:当施加那些方法是对象如何响应,颜色,尺寸,外型。
对象的表示:对象的表示就相当于身份证,具体区分在相同的行为与状态下有什么不同。
面向对象模型
面向对象的概念:
oop(面向对象的编程)它能是其代码更加简洁易于维护并且具有更强的可重性
代码如下:
final public function test(){
依此类推,对于不想有子类的父类,在类名那里写上final
代码如下:
final class BaseClass{
代码如下:
//定义一个接口
interface ICanEat{
public function eat($food);
}
可以看到,接口中并没有方法的具体实现,但必须有方法!
那么,下面是,“人类会吃”
//具体对象,连接到接口 class Human implements ICanEat{ public function eat($food){ echo "Human eating ".$food.".<br/>"; } } $obj=new Human(); $obj->eat("shit");
请忽略我给出的“食物”。
代码如下:
var_dump($obj instanceof ICanEat);
会返回boolean值。
--更多的栗子
interface ICanPee extends ICanEat{ public function pee(); } class Demon implements ICanPee{ public function pee(){ echo "Can demon pee?"; } public function eat($food){ echo "Can demon eat ".$food; } } $ghost=new Demon(); $ghost->pee(); $ghost->eat("shit");
接口本质上也是类,可以被继承/继承,但是使用继承接口的接口,所有父类、“爷类”的方法都要有具体实现。
--小结
/**
* 接口
* 1. 接口的基本概念和基本使用方法
* 2. 接口里面的方法没有具体的实现
* 3. 实现了某个接口的类必须提供接口中定义的方法
* 4. 不能用接口创建对象,但是能够判断某个对象是否实现了某个接口
* 5. 接口可以继承接口(interface extends interface)
* 6. 接口中定义的所有方法都必须是公有,这是接口的特性。
*/
aaaaaaaaaaaaaa
bu xiang xie le....................
ming tian yao ge ..............
以上内容是小编给大家介绍的PHP面向对象详解(三),希望大家喜欢。

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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