A brief analysis of how to set the maximum file limit in PHP

When developing web applications using PHP, we often need to upload files. However, there is a limit to the size of the uploaded file. The default setting for PHP is 2MB. In order to upload larger files, we need to change the settings of PHP to allow larger file uploads.

In PHP, there are two important settings that can affect the file upload size. The first is upload_max_filesize, which specifies the maximum file size allowed to be uploaded. The default value is 2MB. The second setting is post_max_size, which specifies the maximum data allowed to be sent in a post request. If the uploaded file size is larger than the size set by post_max_size, the upload will fail.

In order to upload larger files, we need to set the values ​​of upload_max_filesize and post_max_size to the values ​​we need. We can do this by editing these values ​​in the php.ini file.

In Unix/Linux systems, the php.ini file is usually in the /etc/php/7.x/ directory, where 7.x represents the PHP version number. In Windows systems, the php.ini file is usually in the C:\Windows directory.

Open the php.ini file and find the following two lines:

upload_max_filesize = 2M
post_max_size = 8M

Set the value of upload_max_filesize to the maximum upload file size you need, for example:

upload_max_filesize = 100M

Set the value of post_max_size Set the value to a value slightly larger than the uploaded file size, for example:

post_max_size = 110M

Save the php.ini file and restart the web server to upload larger files.

In addition to setting in the php.ini file, we can also use the ini_set function in the PHP script to set the values ​​of upload_max_filesize and post_max_size. For example:

ini_set('upload_max_filesize', '100M');
ini_set('post_max_size', '110M');

It should be noted that modifying these settings will not only affect the file upload size, but also the amount of data sent by the POST request. Therefore, you must ensure that these values ​​are large enough based on the server's hardware and network conditions.

Overall, setting the php file upload size is a simple but important step. Hope this article is helpful to you!

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