本文采用类似java中annotation的形式实现set注入
首先DI容器代码
require 'DocParser.php';class Container { /** * 利用容器来实例化对象,外部调用接口 *@param $name 为类名 eg. 'User' */ public function get($name) { static $cache = array(); if(isset($cache[$name])) { return $cache[$name]; } require 'models/' . ucfirst($name) . '.php'; $reflection = new ReflectionClass($name); $depends = $this->getDependency($reflection); $cache[$name] = $this->createObject($reflection, $depends); return $cache[$name]; } /** * 利用反射获取类需要的依赖条件,注释中包含@inject 注解的public 变量 * @param $reflection ReflectionClass */ public function getDependency($reflection) { $depends = array(); $props = $reflection->getProperties(ReflectionProperty::IS_PUBLIC); foreach ($props as $prop) { $str = $prop->getDocComment(); $parser = new DocParser(); $anotations = $parser->parse($str); if(isset($anotations['inject'])) { $depends[$prop->getName()] = $anotations['inject']; } } return $depends; } /** * 实例化对象的方法 * @param $instance ReflectionClass * @param $depends array( 'field' => 'Class' ), field 为注入的变量名,class为注入的类 */ public function createObject($instance, $depends) { $instance = $instance->newInstanceArgs(array()); foreach ($depends as $key => $value) { $instance->{$key} = $this->get($value); } return $instance; }}
其中 DocParser.php 为解析php注释的工具类。
在同级目录下新建models文件夹,新建User.php
class User { /** * 使用inject注解来标明该变量需要注入,后面跟着需要注入的类名 * @inject Email */ public $email; public function sendEmail() { $this->email->sendEmail(); }}
新建Email.php
class Email { public function sendEmail() { echo 'send email!'; }}
在根目录下新建index.php
require 'Container.php';$di = new Container();$user = $di->get('User');$user->sendEmail();
运行一下index.php就能看到结果了。
本文只是演示IOC的实现过程,没有考虑实际使用场景。
源码 下载地址

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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