What PHP functions or methods can be utilized to extract file extensions and handle filenames with multiple periods?

When dealing with filenames that have multiple periods, extracting the file extension can be tricky as simply using functions like `pathinfo()` or `explode()` may not give the desired result. To handle filenames with multiple periods, you can use the `strrpos()` function to find the position of the last period in the filename and extract the extension accordingly. 

// Example filename with multiple periods
$filename = "example.file.name.txt";

// Find the position of the last period in the filename
$lastPeriodPos = strrpos($filename, '.');

// Extract the file extension
$fileExtension = substr($filename, $lastPeriodPos + 1);

echo $fileExtension; // Output: txt

Keywords

PHP functions methods file extensions filenames periods.

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