php-文件下载

<?php

    $dirname="tp";
    
    function tp($dirname){
        $ds=opendir($dirname);
            while($file=readdir($ds)){
                $path=$dirname.'/'.$file;
                if($file!='.' && $file!='..'){
                    if(is_dir($path)){
                        tp($path);
                    }
                    else{
                        echo "<tr>";
                        echo "<td><img src='$path'></td>";
                        echo "<td><a href='$path'>下载</a></td>";
                        echo "<tr>";
                        
                    }
                }
            }
        }
        echo "<h2>文件下载</h2>";
        echo "<table border='1px'>";
        tp($dirname);
        echo "</table>";
?>