What are some recommended PHP functions or methods for handling file extensions?

When working with file extensions in PHP, it is important to validate and handle them properly to ensure the security and integrity of your application. One recommended approach is to use the pathinfo() function to extract the file extension from a file path. This function returns an associative array with information about the file path, including the extension. 

// Example of using pathinfo() to handle file extensions
$file_path = 'example.txt';
$file_info = pathinfo($file_path);

// Get the file extension
$file_extension = $file_info['extension'];

// Output the file extension
echo $file_extension;

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file extension PHP functions handling methods recommended

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