s_uploaded_file和 file_exists都是检查文件存在不？参数都是路径，那为什么上传文件一定要用is_uploaded_file呢？
回复讨论(解决方案)
呵呵，这是一个有历史渊源的问题。使用 is_uploaded_file 也完全是出于自我保护
php 提供了两个处理上传文件的方案
move_uploaded_file
和
is_uploaded_file
copy 或 rename
copy 和 rename 都是文件系统函数，当然不只是针对上传文件的
所以你完全可以用 copy 函数将 linux 的用户口令文件 etc/password 做一个副本
php 还提供了一个 register_globals 开关，用于将传入的变量自动导入全局变量表（php5.4开始不可用了）
当此开关打开时
将产生变量 $file_name、$file_tmp、$file_type....等变量
而upload.php?file_tmp=etc/password 也将产生 $file_tmp 变量
那么你就需要准确的知道这个 $file_tmp 是由 type=file 产生的还是由 URL参数产生的了
当然，这种情况并不会发生，因为 php 还有一重保护机制（这个留给你自己发现吧）
但是由于代码是千变万化的，保守一点比较稳妥。指不定哪就出现了危机
Working with Flash Session Data in LaravelMar 12, 2025 pm 05:08 PMLaravel simplifies handling temporary session data using its intuitive flash methods. This is perfect for displaying brief messages, alerts, or notifications within your application. Data persists only for the subsequent request by default: $request-
cURL in PHP: How to Use the PHP cURL Extension in REST APIsMar 14, 2025 am 11:42 AMThe PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.
Simplified HTTP Response Mocking in Laravel TestsMar 12, 2025 pm 05:09 PMLaravel provides concise HTTP response simulation syntax, simplifying HTTP interaction testing. This approach significantly reduces code redundancy while making your test simulation more intuitive. The basic implementation provides a variety of response type shortcuts: use Illuminate\Support\Facades\Http; Http::fake([ 'google.com' => 'Hello World', 'github.com' => ['foo' => 'bar'], 'forge.laravel.com' =>
12 Best PHP Chat Scripts on CodeCanyonMar 13, 2025 pm 12:08 PMDo you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom
Explain the concept of late static binding in PHP.Mar 21, 2025 pm 01:33 PMArticle discusses late static binding (LSB) in PHP, introduced in PHP 5.3, allowing runtime resolution of static method calls for more flexible inheritance.Main issue: LSB vs. traditional polymorphism; LSB's practical applications and potential perfo
PHP Logging: Best Practices for PHP Log AnalysisMar 10, 2025 pm 02:32 PMPHP logging is essential for monitoring and debugging web applications, as well as capturing critical events, errors, and runtime behavior. It provides valuable insights into system performance, helps identify issues, and supports faster troubleshoot
Discover File Downloads in Laravel with Storage::downloadMar 06, 2025 am 02:22 AMThe Storage::download method of the Laravel framework provides a concise API for safely handling file downloads while managing abstractions of file storage. Here is an example of using Storage::download() in the example controller:
HTTP Method Verification in LaravelMar 05, 2025 pm 04:14 PMLaravel simplifies HTTP verb handling in incoming requests, streamlining diverse operation management within your applications. The method() and isMethod() methods efficiently identify and validate request types. This feature is crucial for building
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Zend Studio 13.0.1
Powerful PHP integrated development environment
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
