A brief analysis of how to query the maximum size of uploaded files in PHP

PHP is a server-side scripting language widely used in web development. If you are a PHP developer, then you may have tried uploading files to the server. Uploaded files must be stored in the server, so the server must support the upload operation. The maximum size of the uploaded file is determined by the server's configuration file, which is usually included in the PHP configuration file. In this article, we will discuss how to query the maximum size of an uploaded file.

First, we need to view the php.ini configuration file. This file is usually located in the root directory of the server. After opening this file, we need to look for the two options post_max_size and upload_max_filesize.

The post_max_size option specifies the maximum data size that can be submitted by POST, including uploaded files and other data in the form. The upload_max_filesize option specifies the maximum size of a single uploaded file. These two together specify the maximum size of the uploaded file.

In the php.ini file, we can query the maximum size of file uploads by looking for the post_max_size and upload_max_filesize options. Both options have a default value. If these two options are not set, the default value is 2M. We can modify the values ​​of these two options to change the maximum size of uploaded files. For example, if we set the value of the upload_max_filesize option to 10M, the maximum size of the uploaded file will increase to 10M.

In addition to querying the maximum size of uploaded files by viewing the php.ini file, we can also use PHP code to query the maximum size of uploaded files. The following is a PHP code example:

<?php
  echo ini_get(&#39;post_max_size&#39;).&#39;<br>'; //将打印出post_max_size的值
  echo ini_get('upload_max_filesize').'<br>'; //将打印出upload_max_filesize的值
?>

The ini_get() function in the code is used to get the value of the option in the php.ini file. Using this function, we can query the maximum size of the uploaded file and display it on the web page.

In short, if you are developing a web application that needs to upload files, it is very important to know how to query the maximum size of uploaded files. By looking at the php.ini file or using PHP code to query this value, you can easily understand the maximum size of the uploaded file and adjust the server's settings accordingly to meet the needs of the uploaded file.

The above is the detailed content of A brief analysis of how to query the maximum size of uploaded files in PHP. For more information, please follow other related articles on the PHP Chinese website!