How to save and output files using PHP MySQL_PHP Tutorial
After the local file is uploaded to the server, the server script saves the file. There are generally two ways, one is as
The file is saved to a specific directory on the machine, but there are many inconveniences caused by duplicate file names. Some procedures
The program automatically changes the file name, adds the upload time to the name, etc. to ensure the uniqueness of the file name, thus losing the originality of the file
There are also many difficulties in querying specific file information through file names, which is not conducive to unified management of files; one is to use the file
Save the file to the database and use the powerful functions of the database to conveniently implement various operations on the file. This article uses the
Two methods.
This set of programs demonstrates how to upload a file from the hard disk to the server's database through a web page, and
Read the contents of the file.
Instructions for use:
There are 5 programs in total, the descriptions are as follows:
1. file.sql --- The structure of the database table used in this program [Note: the database used is test]
2. upload.php --- upload form
3. submit.php --- upload handler
4. show_info.php --- Display part of the uploaded file information
5. show_add.php --- show [download] file
////////////////////////////////////////////////////// /////////////////////
(1) file.sql ---
//Brief description
The database structure that saves the basic information of the uploaded file. Here we focus on the fields that save the file content, using the longtext type
Because the ordinary blob type can store up to 64K bytes. In addition, the default configuration of general php has a maximum upload file of 2M. If the above is
The uploaded file is very large, so don’t forget to adjust the settings of php.ini.
//File source code
create table receive(
id int NOT NULL auto_increment, #primary key, automatic accumulation
file_data longblob, #File content
file_type varchar(100), #File type
file_name varchar(255), #File name
file_size int, #File size
PRIMARY KEY(id) #Primary key
)
////////////////////////////////////////////////////// /////////////////////
(2) upload.php ---
//Brief description
In the upload interface, the user selects the file and then submits it to submit.php for processing
It is worth noting that there is a hidden value field of MAX_FILE_SIZE, which can be set by setting its VALUE
to limit the size of uploaded files.
//Program source code
Select upload file | |
type='submit'> |

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

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.
