银河星尘

<?php
define('DS', DIRECTORY_SEPARATOR);
function rec_list_files($from = '.')
{
    if(!is_dir($from)) {
        return array();
    }
    $files = array();
    if($dh = opendir($from))
    {
        while(false !== ($file = readdir($dh))) {
 
            if($file == '.' || $file == '..') {
                continue;
            }
            $path = $from . DS . $file;
 
            if (is_file($path)) {
                $files[] = $path;
            }
            $files = array_merge($files, rec_list_files($path));
        }
        closedir($dh);
    }
    return $files;
}
 
function deep_first_list_files($from = '.')
{
    if(!is_dir($from)) {
        return false;
    }
    $files = array();
    $dirs = array($from);
    while(NULL !== ($dir = array_pop($dirs))) {
        if( $dh = opendir($dir)) {
            while( false !== ($file = readdir($dh))) {
                if($file == '.' || $file == '..') {
                    continue;
                }
                $path = $dir . DS . $file;
                if(is_dir($path)) {
                    $dirs[] = $path;
                } else {
                    $files[] = $path;
                }
            }
            closedir($dh);
        }
    }
    return $files;
}
 
function breadth_first_files($from = '.') {
    $queue = array(rtrim($from, DS).DS);// normalize all paths
    $files = array();
    while($base = array_shift($queue )) {
        if (($handle = opendir($base))) {
            while (($child = readdir($handle)) !== false) {
               if( $child == '.' || $child == '..') {
                    continue;
                }
                if (is_dir($base.$child)) {
                    $combined_path = $base.$child.DS;
                    array_push($queue, $combined_path);
                } else {
                    $files[] = $base.$child;
                }
            }
            closedir($handle);
        } // else unable to open directory => NEXT CHILD
    }
    return $files; // end of tree, file not found
}
 
function profile($func, $trydir)
{
    $mem1 = memory_get_usage();
    echo '<pre>———————– Test run for '.$func.'() ...';
    flush();
    $time_start = microtime(true);
    $list = $func($trydir);
    //print_r($list);
    $time = microtime(true) - $time_start;
    echo 'Finished : '.count($list).' files</ pre>';
    $mem2 = memory_get_peak_usage();
    printf('<pre>Max memory for '.$func.'() : %0.2f kbytes Running time for '.$func.'() : %0.f s</ pre>',
    ($mem2-$mem1)/1024.0, $time);
    return $list;
}
profile('rec_list_files', "D:\www\server");
profile('deep_first_list_files', "D:\www\server");
profile('breadth_first_files', "D:\www\server");
?>

-----------------------
Test run for rec_list_files() ...Finished : 1868 files
Max memory for rec_list_files() : 496.93 kbytes Running time for rec_list_files() : 9.231678 s
----------------------- 
Test run for deep_first_list_files() ...Finished : 1868 files
Max memory for deep_first_list_files() : 432.41 kbytes Running time for deep_first_list_files() : 3.940216 s
----------------------- 
Test run for breadth_first_files() ...Finished : 1868 files
Max memory for breadth_first_files() : 432.55 kbytes Running time for breadth_first_files() : 3.749125 s