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Course Introduction：DependencyInjection(DI)inPHPenhancescodeflexibilityandtestabilitybydecouplingclassesfromtheirdependencies.1)UseConstructorInjectiontopassdependenciesviaconstructors,ensuringfullinitialization.2)EmploySetterInjectionforpost-creationdependencychanges,t

2025-05-10 comment 0  214

Course Introduction：Implementing dependency injection (DI) in PHP can be done by manual injection or using DI containers. 1) Manual injection passes dependencies through constructors, such as the UserService class injecting Logger. 2) Use DI containers to automatically manage dependencies, such as the Container class to manage Logger and UserService. Implementing DI can improve code flexibility and testability, but you need to pay attention to traps such as overinjection and service locator anti-mode.

2025-05-07 comment 0  1149

Course Introduction：This article discusses how to build a simple dependency injection container (DI container) PHP package. All code in the article, including PHPDoc annotations and unit tests (100% code coverage), has been uploaded to the GitHub repository and listed on Packagist. Key points: Building DI containers helps developers understand the basic principles of dependency injection and the working mechanism of containers. DI containers have two main functions: "dependency injection" and "container". It needs to be able to instantiate and include services using constructor injection or setter injection methods. Symfony dependency injection containers can be used as a reference for creating custom containers. It divides container configuration into parameters and services, allowing secure storage

2025-02-15 comment 0  905

Course Introduction：Execution of SQL statements with parameters in PHPMyAdmin can be achieved in three ways: 1) Splicing through SQL strings, although simple, it needs to prevent SQL injection; 2) Using PHP preprocessing statements, it is highly secure but requires writing code outside PHPMyAdmin; 3) Using user-defined variables, it directly operates in PHPMyAdmin but fails after the variable session ends.

2025-05-19 comment 0  238

Course Introduction：Dependency injection (DI) is a design pattern used to improve code flexibility and testability. 1. It reduces coupling by providing dependencies from the outside rather than internal creation; 2. In PHP, DI is usually implemented through constructors or setter methods; 3. Using DI can improve testability, flexibility and separate concerns; 4. Dependencies can be automatically resolved through containers during actual use; 5. However, DI can not be used in simple scripts or performance-sensitive scenarios.

2025-06-26 comment 0  640

Course Elementary  13766

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

Course Elementary  82276

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

Course Elementary  13141

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

Course Elementary  24589

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Course Elementary  27445

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.