PHP is a widely used scripting language often used for server-side programming. Processing of form data submitted by users can be easily implemented using PHP. However, sometimes we encounter such a problem: the data submitted in the form using the FormData format cannot be received in the PHP code. So, how to solve this problem?
First of all, we need to understand the form submission method in FormData format. FormData is a new API for building form data, which can handle forms containing complex data types such as text, files, binary data, etc. When using FormData to submit form data, you must use the POST method.
For example, we can use the following code to create a FormData object containing text and files:
var formData = new FormData(); formData.append('name', 'Bob'); formData.append('file', fileInput.files[0]);
Where, 'name' is the name of the form item, and 'Bob' is its value; 'file' is the name of the file upload control, and fileInput.files[0] is the data of the file. You can use the XMLHttpRequest object to send a FormData object to the server before the form is submitted.
In PHP, there is usually no problem using the $_POST array to receive data submitted by a form. However, if the form uses the FormData format to submit data, you need to use the $_FILES array to receive the data. The $_FILES array contains information about uploaded files.
For example, we can use the following code to receive the data submitted by FormData in PHP:
$name = $_POST['name']; $file = $_FILES['file'];
Among them, $name is the value of the form item 'name'; $file is the information of the uploaded file.
If there is a problem of not receiving FormData, you can try the following solutions:
- Check the request header: Use tools such as Fiddler or Chrome Devtools to check the request header submitted by the form to ensure Content-Type is set to 'multipart/form-data'.
- PHP configuration: Check the PHP configuration file to ensure that configuration items such as file_uploads and post_max_size are set correctly.
- Upload file size limit: Check whether the upload file size exceeds the limit size set in the PHP configuration file.
- File upload path: Check whether the saving path of the uploaded file is set correctly.
Summary:
To receive data submitted by FormData in PHP, you need to use the $_FILES array instead of the $_POST array. If there is a problem of not receiving FormData, you need to check the form request header, PHP configuration, upload file size limit, file upload path and other settings.
The above is the detailed content of What should I do if php cannot receive formdata?. For more information, please follow other related articles on the PHP Chinese website!

The article compares ACID and BASE database models, detailing their characteristics and appropriate use cases. ACID prioritizes data integrity and consistency, suitable for financial and e-commerce applications, while BASE focuses on availability and

The article discusses securing PHP file uploads to prevent vulnerabilities like code injection. It focuses on file type validation, secure storage, and error handling to enhance application security.

Article discusses best practices for PHP input validation to enhance security, focusing on techniques like using built-in functions, whitelist approach, and server-side validation.

The article discusses strategies for implementing API rate limiting in PHP, including algorithms like Token Bucket and Leaky Bucket, and using libraries like symfony/rate-limiter. It also covers monitoring, dynamically adjusting rate limits, and hand

The article discusses the benefits of using password_hash and password_verify in PHP for securing passwords. The main argument is that these functions enhance password protection through automatic salt generation, strong hashing algorithms, and secur

The article discusses OWASP Top 10 vulnerabilities in PHP and mitigation strategies. Key issues include injection, broken authentication, and XSS, with recommended tools for monitoring and securing PHP applications.

The article discusses strategies to prevent XSS attacks in PHP, focusing on input sanitization, output encoding, and using security-enhancing libraries and frameworks.

The article discusses the use of interfaces and abstract classes in PHP, focusing on when to use each. Interfaces define a contract without implementation, suitable for unrelated classes and multiple inheritance. Abstract classes provide common funct


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

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

Dreamweaver Mac version
Visual web development tools

Dreamweaver CS6
Visual web development tools