In what situations would using the filesize() function be appropriate for calculating database size in PHP?

Using the filesize() function in PHP to calculate database size is not appropriate, as databases are typically stored in a structured format that cannot be measured in terms of file size alone. Instead, you should use database-specific queries or tools provided by the database management system to accurately determine the size of the database.

// Incorrect usage of filesize() function to calculate database size
$filesize = filesize('database.db');
echo "Database size: " . $filesize . " bytes";