PHP gets the value of form form file field
The function of the file field is to upload files or pictures. The file field has a unique attribute, which is used to specify the type of uploaded file. If you need to display the type of uploaded file, you can set this attribute.
In the development process, file or image uploading is an essential part of some website applications. For example, personal blogs upload personalized avatars, some forums share good learning materials, etc. This involves the knowledge of using forms to process file uploads. In PHP, we can use the $_FILES global array to handle it. Let’s take a look at the basic file upload processing part. First of all, it should be noted that being able to upload files must be a security risk, so when developing this part of the function, you must pay attention to the security of the website. What is discussed here is only the basic file upload part. It provides basic knowledge of PHP file upload so that friends can understand the simplest principles and code knowledge. There is less consideration in this aspect of security.
$_FILES: Variables submitted to the script via HTTP POST file upload. The contents of the
$_FILES array are as follows:
$_FILES['myFile']['name'] The original name of the client file.
$_FILES['myFile']['type'] The MIME type of the file, which requires the browser to provide support for this information, such as "image/gif".
$_FILES['myFile']['size'] The size of the uploaded file, in bytes.
$_FILES['myFile']['tmp_name'] The temporary file name stored on the server after the file is uploaded, usually the system default. It can be specified in upload_tmp_dir of php.ini, but setting it with the putenv() function will not work.
$_FILES['myFile']['error'] Error code related to the file upload. ['error'] was added in PHP 4.2.0. ["error"] value in
$_FILES["file"]["error"]:
UPLOAD_ERR_OK value: 0; No error occurs, file Upload successful
UPLOAD_ERR_INI_SIZE Value: 1; The uploaded file exceeds the value limited by the upload_max_filesize option in php.ini Value of
UPLOAD_ERR_PARTIAL Value: 3; Only part of the file is uploaded
UPLOAD_ERR_NO_FILE Value: 4; No file is uploaded, Value: 5; The uploaded file size is 0.
Here is a simple example. Select the file to be uploaded and click the "Upload" button. The absolute path of the file to be uploaded will be displayed above.
The specific development steps are as follows:
(1) Create a new index.php dynamic page, create a form form, add a file field and a submit button, the main The code is as follows:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>form</title> </head> <body> <form action="index.php" method="post" name="form1"> <input type="file" name="file" size="15"> <input type="submit" name="upload" value="上传文件"> </form> </body> </html>
Description: This example implements getting the value of the file field, and does not implement the uploading of images, so there is no need to set the
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
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1387
52
PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian
Dec 24, 2024 pm 04:42 PM
PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati
7 PHP Functions I Regret I Didn't Know Before
Nov 13, 2024 am 09:42 AM
If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op
How To Set Up Visual Studio Code (VS Code) for PHP Development
Dec 20, 2024 am 11:31 AM
Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
