Function to rename a file using snake case

rename_file_with_snake_case.php

<?php

function rename_file_with_snake_case(string $filename): string {
	$basename = basename($filename);
	$dir      = dirname($filename);
	$newName  = strtolower($basename);
	$newName  = preg_replace('/[^\w\.]/', ' ', $newName);
	$newName  = preg_replace('/\s+/', ' ', $newName);
	$newName  = preg_replace('/\s/', '_', $newName);
	$newName  = preg_replace('/_\./', '.', $newName);
	rename($filename, "$dir/$newName");
	return "$dir/$newName";
}