How to modify php upload size

In web applications, uploading files is a common requirement, and PHP, as one of the common languages ​​for web application development, also provides some basic ways to upload files. But when the upload file size exceeds the default limit, you need to modify the PHP upload file size. This article will introduce how to modify the size of PHP upload files.

1. Check the current upload file size limit

Before making modifications, we need to first understand the current PHP upload file size limit. You can view it through the following steps:

1. Search upload_max_filesize in the php.ini file and you can find the following code:

; Maximum allowed size for uploaded files.
; http://php.net/upload-max-filesize
upload_max_filesize = 2M

Among them, the upload_max_filesize parameter indicates the maximum upload file size, 2M means 2MB.

2. Also search for post_max_size in the php.ini file and you can find the following code:

; Maximum size of POST data that PHP will accept.
; http://php.net/post-max-size
post_max_size = 8M

Among them, the post_max_size parameter indicates the maximum size limit of the post request, 8M means 8MB.

2. Modify the size limit of php upload files

There are two ways to modify the size limit of php upload files, one is by modifying the php.ini file, the other is by modifying the code Revise.

1. By modifying the php.ini file

To modify the upload file size limit in the php.ini file, simply follow these steps:

1. Find the php.ini file, which can usually be found in the root directory of the website. If it cannot be found, you can look for the Loaded Configuration File in the results of the phpinfo() function.
2. Open the php.ini file using a text editor.
3. Find the following two parameters in the file:

upload_max_filesize = 2M
post_max_size = 8M

4. Modify the values ​​​​of these two parameters to the required size, for example:

upload_max_filesize = 16M
post_max_size = 32M

5. Save the php.ini file and restart the apache server.
6. By modifying it in the code

Sometimes, due to server configuration limitations, the upload file size limit cannot be modified by modifying the php.ini file. You can add the following code to the code To achieve:

ini_set('upload_max_filesize', '16M');
ini_set('post_max_size', '32M');

This way you can set the upload file size limit in the code.

3. Notes

When modifying the PHP upload file size limit, there are several points to note:

1. When modifying the php.ini file, you must first Back up the original file.
2. After modifying the php.ini file, you need to restart the apache server for the new settings to take effect.
3. When modifying the upload file size limit, the size should be set according to actual needs and should not be set too large to avoid unnecessary pressure on server resources.
4. After modifying the upload file size limit, the file upload code in the application needs to be modified accordingly to support the new upload file size.

In short, modifying the PHP upload file size limit is a relatively simple matter. You only need to follow the above steps. However, in actual applications, detailed testing is required to ensure that the modified upload file size meets actual needs.

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