递归显示目录

<?php
function tree($directory)
{
    $mydir = dir($directory);
    echo "<ul>";
    while ($file = $mydir->read()) {
        if ($file == "." || $file == "..") {
            continue;
        }
        if (is_dir("$directory/$file")) {
            echo "<li><font color='blue'><b>$file/</b></font></li>";
            tree("$directory/$file");
        } else {
            echo "<li>$file</li>";
        }
    }
    echo "</ul>";
    $mydir->close();
}

echo "<h2>目录为蓝色</h2>";
tree(".");