How to set the maximum upload file size limit in php

PHP, as a popular server-side programming language, is often used to build web applications. When building web applications, the need to upload files is very common. In PHP, it also provides the function of uploading files. However, sometimes we need to upload larger files, which requires expanding PHP's upload file size limit. Therefore, this article will explain how to set the maximum upload file size in PHP.

Why do you need to set the maximum upload file size of PHP?

During web application development, sometimes we need to upload large files. However, when we use PHP to upload files, PHP may not be able to handle large files due to the default settings of the server.

At this time, we need to modify some parameters in the PHP configuration file to increase the file size that PHP can upload. If we don't change these settings, PHP's default file upload size limit is 2MB.

How to set the maximum upload file size of PHP?

To set the maximum upload file size of PHP, you need to modify the following three PHP configuration items:

1. upload_max_filesize: PHP maximum upload file size limit
2. post_max_size: POST Maximum data size limit
3. memory_limit: The maximum memory that can be used when PHP is running

These settings can be found in the PHP configuration file php.ini. php.ini is the PHP configuration file, used to configure some important parameters of PHP.

The following are the steps on how to modify the php.ini file:

Step 1: Find the php.ini file

Normally, php.ini is stored in Windows by default C:\Windows directory.

Step 2: Open the php.ini file

Use a text editor to open the php.ini file. This file contains various configurations of PHP.

Step 3: Modify the maximum upload file size of PHP

Search for the configuration content upload_max_filesize and find the line where this field is located.

This field indicates the maximum upload file size limit of PHP. The default size is 2M.

You can change 2M to the required file size, such as 30M, 100M, etc.

Step 4: Modify the maximum size of POST data

Search for the post_max_size configuration item.

This setting is used to determine the maximum amount of data passed to PHP in a POST request.

Compared with upload_max_filesize, the value of post_max_size can be larger. Because the former works for uploading a single file, while the latter works for the entire request.

It can be set to the same value to ensure that PHP can upload the uploaded file size. This value must be greater than upload_max_filesize.

Step 5: Modify the maximum memory that can be used when PHP is running

Find the memory_limit configuration item in php.ini.

This setting is used to determine the maximum amount of memory that can be used when PHP is running. You can set it to a larger value here, however, the value cannot exceed your computer's available memory.

Step 6: Save and close the php.ini file

Finally, save and close the php.ini file.

After saving the file changes, restart the web server to make the changes take effect.

Summary

In this article, we introduced how to set the maximum upload file size in PHP to solve the problems encountered in uploading large files during web application development. By modifying the upload_max_filesize, post_max_size and memory_limit configuration items in the php.ini file, PHP can upload larger files.

It should be noted that before modifying these settings, please ensure that your server's hardware and network connection can support large file uploads, otherwise your server may become slow or unstable.

The above is the detailed content of How to set the maximum upload file size limit in php. For more information, please follow other related articles on the PHP Chinese website!