PHP Fileinfo Usage Guide

PHP Fileinfo is a PHP extension that allows developers to easily obtain information about a file, such as its type, MIME type, size, and permissions. It provides a set of functions for detecting and extracting file attributes, enabling developers to more conveniently handle and recognize files, ensuring their safety and accuracy.

The basic steps for using the Fileinfo extension are as follows:

1. Firstly, it is necessary to ensure that the Fileinfo extension is installed and enabled. This can be checked by either inspecting the php.ini file or using the extension_loaded() function in the code.
2. Create a Fileinfo resource object using the finfo_open() function.
3. With the finfo_file() function, you can detect the properties of a specified file and obtain information such as the MIME type and file type.
4. Use the finfo_close() function to close the Fileinfo resource object and free up resources.

The sample code is shown below:

$filePath = 'example.txt';

$fileInfo = finfo_open(FILEINFO_MIME_TYPE);
$fileType = finfo_file($fileInfo, $filePath);

echo "File type: $fileType";

finfo_close($fileInfo);

The code above demonstrates how to retrieve the MIME type of a specified file. The Fileinfo extension can easily and quickly provide file information, making it convenient for developers to handle file operations.