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Article Introduction：This article describes how to get the main file name that calls the function in a Python library function. Get the path of the running script through sys.argv[0], and extract the file name using ntpath.basename to dynamically obtain the caller file name, thereby avoiding relying on source code browsing.

2025-08-22 comment 0  647

Article Introduction：This article introduces a method to obtain the caller's main file name in Python library functions. Get the path of the currently running script through sys.argv[0] and extract the file name using ntpath.basename, so as to achieve the effect of returning the name of each script when calling the same library function in different scripts. This method is concise and effective, avoiding the complex source code search process.

2025-08-23 comment 0  499

Article 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  1133

Article Introduction：UsefinfoclasstodetectMIMEtypeaccurately.Example:$finfo=newfinfo(FILEINFO_MIME_TYPE);$mimeType=$finfo->file('file.jpg');Outputs:image/jpeg.Alwaysverifyuploadedfilesusing$finfo->file($_FILES['file']['tmp_name'])insteadoftrusting$_FILES['type'].En

2025-09-02 comment 0  655

Article Introduction：I encountered a tricky problem when developing a file processing system: how to accurately detect the MIME type of a file. Initially, I tried using PHP's built-in functions mime_content_type() and finfo classes, but found that these methods were not stable enough when processing certain special files, causing the system to misjudgment the file type, affecting the user experience. After some exploration, I found the library league/mime-type-detection which brought the perfect solution to my project.

2025-04-17 comment 0  504

Article Introduction：This tutorial details how to get the attributes of uploaded files from the Request object in a Laravel application. By leveraging the convenient methods provided by the Illuminate\Http\UploadedFile instance, developers can easily access the original name, extension, MIME type and size of the file, laying the foundation for subsequent file processing and storage operations.

2025-09-12 comment 0  193

Article Introduction：This article addresses the challenge of determining the image type from a base64-encoded string when access to the original image file is limited. It introduces a solution using PHP's FileInfo class, which provides a method to retrieve the MIME type

2024-10-23 comment 0  1083

Article Introduction：Virtual File System (VFS) simulates file system operations in unit tests, avoiding the hassle of cleaning temporary files. This article describes how to use the vfsStream library to simplify the testing of file system operations in PHP unit tests. First, we have a simple FileCreator class for creating files:

2025-02-14 comment 0  515

Article Introduction：A forward declaration is to inform the compiler of the existence of a class, function, or variable in advance without providing a complete definition. It is suitable for scenarios such as using only pointers or references to the class, avoiding cyclic dependencies of header files, and improving compilation efficiency; but it cannot be used to create object instances, access members or inheritance. The correct way to use includes only forward declaration of necessary classes in the header file, moving the specific header file contains to the implementation file, and avoiding forward declaration of standard library types at will.

2025-07-18 comment 0  563

Article 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  488

Article Introduction：Livewire is a powerful Laravel library for building dynamic, responsive interfaces without writing a lot of JavaScript. First install via Composer: composerrequirelivewire/livewire, and then add @livewireStyles and @livewireScripts in the main layout file. Then use phpartisanmake:livewirecounter to create the component. The generated class file contains the public attribute $count and increment/decrement method. The view file uses wire:click to bind the event. 1

2025-08-23 comment 0  406

Article Introduction：The C 17 file system library provides a unified, type-safe interface, making file and directory operations more intuitive and efficient. 1) The std::filesystem::path class simplifies path operation; 2) The std::filesystem::directory_iterator facilitates traversing directories; 3) Pay attention to exception handling and performance optimization to ensure the robustness and efficiency of the program.

2025-04-28 comment 0  1063

Article Introduction：Composer is a PHP dependency management tool that manages project dependencies through composer.json file. 1. Install Composer: Run several commands and move them to the global path. 2. Configure Composer: Create composer.json file in the project root directory and run composerinstall. 3. Dependency management: Specify the library and its version through composer.json, and use semantic version number control. 4. Use Autoloading: Define the automatic loading rules of the class through the autoload field to simplify development. 5. Package management: Supports private library management, defines the private library address through the repositories field

2025-04-18 comment 0  1022

Article Introduction：This article describes how to use PHP to directly read online Excel files from URLs without downloading them locally. By using the cURL library, we can simulate browser requests, get the content of Excel file, and parse and process data using the PHPSpreadsheet library. The article provides detailed code examples and notes to help developers implement this feature easily.

2025-08-22 comment 0  745

Article Introduction：This article details how to get the last access time of a file in Go and compare it with the current time to calculate the time difference. Since the os.FileInfo interface of the Go standard library does not directly provide access time, the article will guide readers how to use the syscall package to obtain this information on Unix-like systems, and provide complete code examples and precautions to help developers accurately manage file timestamps.

2025-08-27 comment 0  699

Article Introduction：This article details how to load, modify, and save existing Excel files using the PHPSpreadsheet library. We will explore the correct loading and writing process, including how to get a worksheet, set cell values, and append new rows after existing data, and emphasize the use of the IOFactory::createWriter method to avoid common errors and ensure the stability and correctness of file operations.

2025-08-29 comment 0  183

Article Introduction：WordPress deeply relies on third-party JavaScript and PHP libraries, among which jQuery is the most widely used JavaScript library, and the PHP library is mainly composed of a single class file. Other JavaScript libraries used include jQuery Masonry, jQuery Hotkeys, jQuery Suggest, jQuery Form, jQuery Color, jQuery Migrate, jQuery Schedule, jQuery UI, Backbone, colorpicker, hoverIntent, S

2025-02-17 comment 0  886

Article Introduction：Verify file type: Use Yii's file validator to check the extension, MIME type and file size to ensure verification on the server; 2. Generate a secure file name: Rename the file through md5 or UUID mechanisms to prevent path traversal and overwrite; 3. Store files outside the web root directory: Store uploaded files in a non-public directory and safely distribute them through the controller; 4. Check the file content: Use getimagesize or image processing library to verify the authenticity of the image, and scan with antivirus software if necessary; 5. Set directory permissions: prohibit uploading directories to execute scripts, and prevent PHP execution through chmod and server configurations (such as .htaccess or Nginx rules); 6. Enable CSRF and access control

2025-09-07 comment 0  785

Article Introduction：This article aims to resolve the issue where custom Manifest properties cannot be read from a modified JAR file. By using the FileSystem API to modify the MANIFEST.MF file in the JAR package, after adding a custom property, it cannot get the property when reading with the JarFile class. This article will analyze the cause of the problem and provide correct modification methods to ensure that custom properties can be read correctly.

2025-08-06 comment 0  408

Article Introduction：This tutorial details the correct way to get file creation and modify timestamps in Python. For common AttributeError: module 'ntpath' has no attribute 'gettime' error, the article points out that os.path.gettime is not a standard library function. The correct practice should use the os.stat() function to obtain file status information, and obtain the creation and modification timestamp through its return object's st_ctime and st_mtime properties, and demonstrate how to convert it into a readable datetime object to ensure the accuracy and reliability of file time operations.

2025-08-16 comment 0  632