Recursive Directory Tree into array

directory_tree.php

<?php

$dir = __DIR__;

function gather($dir){
    $tree = [];
    
    $allFilesAndDirs = glob($dir."/*");
    
    foreach($allFilesAndDirs as $f){
        if(is_dir($f)){
            $tree[] = [$f, gather($f)];
        }
        else{
            $tree[] = $f;
        }
    }

    return $tree;
}

$tree = gather($dir);


var_dump($tree);