Recursive scan directory examples

scan_dir.php

<?php
// Recursive scan directories and collect data (use `scandir` function)
function scan_dir($dir)
{
    $result = [];

    $filenames = array_diff(scandir($dir), ['.', '..']);
    foreach ($filenames as $file) {
        if (is_dir("$dir/$file")) {
            array_push($result, ...scan_dir("$dir/$file"));
        } else {
            $result[] = "$dir/$file"; 
        }
    }
    
    return $result;
}

// print `~/Documents` directories and files
$user = exec('whoami');
$files = scan_dir("/home/$user/Documents");
print_r($files);

scan_recursive.php

<?php
// Recursive scan directories and print type (use `glob` function)
function scan_recursive($dir)
{
    $tree = glob(rtrim($dir, '/') . '/*');
    
    if (is_array($tree)) {
        foreach ($tree as $file) {
            echo $file;
            if (is_dir($file)) {
                echo " -> DIRECTORY\n";
                scan_recursive($file);
            } elseif (is_file($file)) {
                echo " -> FILE\n";
            }
        }
    }
}

// print `~/Documents` directories and files
$user = exec('whoami');
scan_dir("/home/$user/Documents");

scan_recursive_iterator.php

<?php
// Recursive scan directories for files with PHP iterator function
function scan_recursive_iterator($dir)
{
    $recursiveIterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($dir));

    /** @var SplFileInfo $file */
    foreach ($recursiveIterator as $file) {
        echo $file;
        if ($file->isDir()) {
            echo " -> DIRECTORY\n";
        } elseif ($file->isFile()) {
            echo " -> FILE\n";
        }
    }
}

// print `~/Documents` directories and files
$user = exec('whoami');
$files = scan_recursive_iterator("/home/$user/Documents");
print_r($files);