How can the URL of a file stored in a database be used to retrieve its file size in PHP?

To retrieve the file size of a file stored in a database using its URL in PHP, you can use the `filesize()` function in combination with `file_get_contents()` to get the file size. You first need to fetch the file content using `file_get_contents()` and then use `filesize()` to get the size of the content.

$url = "https://www.example.com/file.pdf"; // URL of the file stored in the database
$content = file_get_contents($url); // Get the content of the file
$fileSize = strlen($content); // Get the size of the content in bytes

echo "File size: " . $fileSize . " bytes";