Rename files in a directory just the way you'd like to.

Renamer.php

<?php
// Your configuration starts here.

// Testing. 'true' = Don't actually edit files and only output the name changes.
$testing = false;

// Folders. 'true' = Rename folders and files.
$folders = true;

// Recursive. 'true' = Also rename files in sub-directories.
$recursive = true;

// Your configuration ends here.

function renameRule($name, $prefix)
{
	// Your custom rename rule starts here.
	// Change $name however you like.
	// Prefix debug outputs with $prefix.

	$extension = array_reverse(explode(".", $name))[0];
	$name = substr($name, 0, -(strlen($extension) + 1));

	$name = str_replace([".", "_"], " ", $name);

	$name .= ".".$extension;

	// Your custom rename rule ends here.
	
	return $name;
}

function renameDir($dir, $prefix)
{
	global $argv, $testing, $folders, $recursive;
	foreach(scandir($dir) as $file)
	{
		$path = $dir."/".$file;
		if($path == "./".$argv[0])
		{
			continue;
		}
		if($folders || !is_dir($path))
		{
			$newname = renameRule($file, $prefix);
			$newpath = $dir."/".$newname;
			if($file != $newname)
			{
				if(!file_exists($dir."/".$newname))
				{
					if($testing)
					{
						echo $prefix."'{$file}' would now be '{$newname}'\n";
					} else
					{
						echo $prefix."'{$file}' is now '{$newname}'\n";
						rename($path, $newpath);
					}
				} else
				{
					echo $prefix."CANT RENAME '{$file}' because '{$newname}' already exists!\n";
				}
			}
		}
		if($recursive && !in_array($file, [".", ".."]))
		{
			if(file_exists($path) && is_dir($path))
			{
				echo $prefix.$path."\n";
				renameDir($path, $prefix."  ");
			}
			else if(file_exists($newpath) && is_dir($newpath))
			{
				echo $prefix.$newpath."\n";
				renameDir($newpath, $prefix."  ");
			}
		}
	}
}

renameDir(".", "");
?>