Bulk File re-name :: tested with MP3

file_folder_reader.php

<?php 

	/*$dir_files = glob($_SERVER["DOCUMENT_ROOT"]."/*");
	getFolderFiles($dir_files);*/
	
	$dir = "D:\MUSICS\English\Collections\FAVS";
	$dir = "F:\MOVIES";
	$final_array = array();
	$file_filter = array(
		'video' => array('mkv','mov','mp4','flv', 'avi'),
		'image' => array('png','jpg','jpeg','gif')
		);
	$dir_files = getFolderFiles($dir);



	


	function byteConvertor($bytes)
	{
		$sizes = array(
			'KB' => pow(1024, 1),
			'MB' => pow(1024, 2),
			'GB' => pow(1024, 3),
			'TB' => pow(1024, 4),
			);

		$sizes = array_reverse($sizes);

		$bytes = abs($bytes);

		foreach ($sizes as $key => $size) {
			if($bytes >= $size) {
				$size = $bytes / $size;
				return round($size,2) ." ". $key;
			}
		}
		return $bytes ." Bytes";
	}

	
	function getFolderFiles($dir) {
		global  $final_array,$file_filter;
		
		$scan_dir = scandir($dir);
		
		
		foreach($scan_dir as $scan_dir_result) {
			
			// SKIP BACKING FOLDERS
			if($scan_dir_result != '.' && $scan_dir_result != '..') {
				
				$result_path = $dir."\\".$scan_dir_result;

				$data = array(); // result array

				if(is_dir($result_path)) {
					$data['dirname'] = $scan_dir_result;
					$data['child'] 	 = getFolderFiles($result_path, $final_array);
				} else {
					
					$data = pathinfo($result_path);

					if(is_file($result_path)) {
						try {
							$data['file_size'] 	= byteConvertor(filesize($result_path));
							
						} catch (Exception $e) {
							
						}
					}
					
					if(in_array($data['extension'], $file_filter['video'])) {
						
						
						array_push($final_array, $data);
						
					}
					
				}

				// rename($result_path, $new_file_name);
			}
		}

	}

	?>