Course Introduction：This article details how to upload multiple different types of files in PHP through a single HTML form. The core method is to use the array naming of the HTML input type="file" field (name="fieldname[identifier]"), which enables the PHP's $_FILES hyperglobal variable to clearly distinguish and organize the uploaded file data. Tutorials cover HTML form structure, file traversal on the PHP server side, verification (including file type, size, and upload errors), and complete implementation steps and best practices for safely saving files to the server.
2025-08-17 comment 0 387
Course Introduction：In PHP, automatically loading classes are implemented through the __autoload or spl_autoload_register function. 1. The __autoload function has been abandoned, 2. The spl_autoload_register function is more flexible, supports multiple automatic loading functions, and can handle namespace and performance optimization.
2025-05-15 comment 0 520
Course Introduction：Interfaces define behavioral specifications, and abstract classes provide partial implementations. The interface only defines methods but does not implement them (PHP8.0 can be implemented by default), supports multiple inheritance, and methods must be public; abstract classes can contain abstract and concrete methods, support single inheritance, and members can be protected or public. Interfaces are used to unify behavioral standards, realize polymorphism, and multiple inheritance; abstract classes are used to encapsulate public logic and share partial implementations. Selection basis: Use interfaces when you need to flexibly define behaviors, and use abstract classes when you need to share logic.
2025-07-08 comment 0 490
Course Introduction：Create a model and define file verification rules, and use UploadedFile to handle uploads; 2. Get the uploaded file through getInstance in the controller and call the model's upload method; 3. Use ActiveForm in the view and set the enctype to multipart/form-data; 4. Ensure that the file type is verified, the size is limited, the unique file name is generated and stored in a secure path; 5. Use getInstances and traversal processing for multiple files. File uploads must always be combined with verification and security measures to prevent risks. Yii2 supports safe and efficient file upload through model and component support. After complete implementation, success prompts or errors should be returned to ensure the flow.
2025-08-08 comment 0 473
Course Introduction：There are four practical methods for organizing helper functions in PHP projects: 1. Use a single or multiple helper files, suitable for small projects, placed in the core directory and loaded as soon as possible; 2. Group helper functions into static classes by category to improve readability and maintainability; 3. Automatically load global auxiliary files through Composer's autoload to ensure convenient access; 4. Use namespace and folder structure to manage a large number of auxiliary classes, such as class files divided by functions under App\Helpers. These methods are selected according to the project size. Small projects can use a single file, while large projects are suitable for using structured classes under namespace.
2025-07-07 comment 0 809
Course Elementary 13929
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 82482
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 13267
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 24734
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 27566
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.
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