Display all files and filesizes in directory

Question

This script is working perfectly :

<?php
foreach (glob("*") as $filename) {
    echo "$filename size " . filesize($filename) . "\n";
}
?>

BUT it's not return any sub-directory files... This return all sub-directories files but not the current directory...

<?php
foreach (glob("*/*") as $filename) {
    echo "$filename size " . filesize($filename) . "\n";
}
?>

How do I get all files include directories and directories in single request ?