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Course Introduction：I'm having a tricky problem when developing a PHP project that handles file uploads: How to map the MIME type of a file with its extension exactly? This problem not only affects the identification of files, but also leads to confusion in data processing. After trying multiple methods, I found the fileeye/mimemap library, which not only solved my problem, but also greatly improved the processing efficiency.

2025-04-17 comment 0  1132

Course Introduction：In PHP, implementing polymorphism can be achieved through method rewriting, interfaces, and type prompts. 1) Method rewriting: Subclasses override parent class methods and perform different behaviors according to object type. 2) Interface: The class implements multiple interfaces to realize polymorphism. 3) Type prompt: Ensure that the function parameters are specific to the type and achieve polymorphism.

2025-05-20 comment 0  1136

Course Introduction：This article explains in detail how to handle multiple file uploads in HTML forms in PHP. In response to the common problem of only the first file being uploaded successfully when a form contains multiple input type="file" fields, the article proposes a solution: use array naming (name="fieldName[identifier]") to organize file input fields. In this way, PHP's $_FILES global variable can receive all file data in a structured array, which can easily traverse, verify and store, ensuring that every uploaded file can be processed correctly.

2025-08-16 comment 0  348

Course Introduction：To effectively handle file uploads in PHP, you need to perform the following steps in turn: First, check whether the file is uploaded successfully, and determine whether $_FILES['fileToUpload']['error'] is equal to UPLOAD_ERR_OK; second, understand the file information contained in the $_FILES array, such as name, type, tmp_name, error and size; then, use the move_uploaded_file() function to move the file from the temporary path to the specified directory, and ensure that the target directory is writable and the file name is safe; finally, if you need to support multiple file uploads, you should set the name attribute to an array form in HTML, and traverse each process in PHP.

2025-06-20 comment 0  256

Course Introduction：The root cause of encountering the "undefinedreferencetofunction" error is that the linker cannot find the implementation of the function. Specific reasons include: ① The function declaration is not defined only; ② The function definition is misspelled or inconsistent; ③ Multiple source files are not correctly linked; ④ The static library/dynamic library is not correctly linked. The solutions are: ? Check whether the function is implemented in a .cpp file; ? Check the consistency of function signatures; ? Ensure that multiple file projects are compiled and linked together; ? Add correct link parameters when calling third-party libraries; ? Add class scope when using class member functions. Just follow the steps to locate and resolve the problem.

2025-07-07 comment 0  486

Course Elementary  13927

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  13266

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  24732

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.