Found a total of 10000 related content
How do you determine file MIME types in Python?
Article Introduction：How to Determine File MIME Types in PythonDetermining the MIME type of a file can be useful when storing and distributing files, as it enables the...
2024-11-29
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798
How to solve the problem of file type detection using Composer
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
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466
what is a file extension
Article Introduction：The file extension is a suffix at the end of the file name and is used to indicate the file type. It is usually located after a point after a file name, such as .docx or .jpg, which helps computers and users identify how to process files. First, the file extension tells the operating system which program to use to open the file. For example, the .mp3 file is opened by the music player, while the .xlsx file is opened by Excel; secondly, they are also important in terms of security and can help identify malicious files such as document.pdf.exe; common extensions include document class .docx, .pdf, image class .jpg, .png, audio/video class .mp3, .mp4, code class .js, .py, and compressed file class .zi
2025-07-20
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371
How to Determine Image Type from Encoded Base64 String in PHP?
Article Introduction：This article presents a solution for determining the image type from its base64 representation in PHP. Using the FileInfo extension, MIME types of images can be reliably identified, overcoming the limitations of traditional methods. By decoding the b
2024-10-23
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357
Why does Edge keep downloading files I click on
Article Introduction：Clicking on the file link but automatically downloading rather than opening, the main reason is that the website settings and browser processing methods are jointly decided. Specifically, it includes: 1. The MIME type setting affects the browser's identification of file type; 2. Forced download will be done when the Content-Disposition header specifies that the file is "attachment"; 3. File type restrictions or extensions may interfere with normal preview. Users can adjust Edge settings such as turning on PDF preview, resetting default operations, and trying other browsers to troubleshoot problems. If the problem originates from the website or server configuration, you need to manually download the file.
2025-07-23
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840
How to handle File Uploads securely in PHP?
Article Introduction：To safely handle PHP file uploads, you need to verify the source and type, control the file name and path, set server restrictions, and process media files twice. 1. Verify the upload source to prevent CSRF through token and detect the real MIME type through finfo_file using whitelist control; 2. Rename the file to a random string and determine the extension to store it in a non-Web directory according to the detection type; 3. PHP configuration limits the upload size and temporary directory Nginx/Apache prohibits access to the upload directory; 4. The GD library resaves the pictures to clear potential malicious data.
2025-07-08
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807
