Wordpress customize upload media directory

wpCustomUploadsUrl.php

<?php
/**================Customize upload dir url===================**/
function my_custom_medias_dir( $pathdata ) {
	$subdir = '/medias'.$pathdata['subdir'];
	$pathdata['path'] = str_replace($pathdata['subdir'], $subdir, $pathdata['path']);
	$pathdata['url'] = str_replace($pathdata['subdir'], $subdir, $pathdata['url']);
	$pathdata['subdir'] = str_replace($pathdata['subdir'], $subdir, $pathdata['subdir']);
	return $pathdata;
}	

add_filter('upload_dir' , 'my_custom_medias_dir');