create daily folder under every month of folder under every year folder using php

$fodler_array=array(date("Y"), date("m"), date("d"));

foreach($fodler_array as $data)
{
if(!is_dir("assets/".$data))
{
echo '<br />';
mkdir("assets/".$data);
echo 'folder created in assest'.$data;
}
else
{
echo 'folder all ready exits<br />';
}
}