upload.php

<?php
$dir = 'public/report';
$key_name = 'file';

if(!is_null($file = $_FILES[$key_name])) {
	$now = new \DateTime('NOW');
	$date_dir = sprintf("%s/%s/%s", $now->format('Y'),$now->format('m'),$now->format('d'));

	$full_path_dir = sprintf("%s/%s/%s",getcwd(), $dir, $date_dir);

	if(!file_exists($full_path_dir)) {
		mkdir($full_path_dir, 0777, true);
	}

  $full_path_file = $full_path_dir.'/'.$file['name'];

	move_uploaded_file($file['tmp_name'], $full_path_file);
}