php: delete old files by date

delete_old_files.php

$dirs = array
(
        '/net/localhost/biltegia/web-server/uploads',
        '/net/localhost/biltegia/web-server/photos/uploads',
        '/net/localhost/biltegia/web-server/photos/parts',
        '/net/localhost/biltegia/web-server/photos/tmp'
);
$time = 1 * 60 * 60 * 24 * 7 * 4; // hilabete bat - 1 month

$tmp = array();
foreach($dirs as $dir)
{
    $rs = array();
    scandirr($dir, array('.', '..'), $rs);

    foreach($rs as $r)
        $tmp[] = $r;
}

$rs = $tmp;
$now = time();

foreach($rs as $r)
{
        $t = filemtime($r);
        if($now-$time>$t)
                $tmp[] = $r;
}

$rs = $tmp;

foreach($rs as $r)
{
        $c = "shell_exec(\"rm -rf {$r}\")";
        shell_exec("rm -rf \"{$r}\"");
}

// all files in first array
function scandirr($folder, $deny = array(), &$result)
{
        if(is_dir($folder))
        {
                $resources = scandir($folder);
                foreach($resources as $resource)
                {
                        if(!in_array($resource, $deny))
                        {
                                $r = $folder."/".$resource;
                                if(is_dir($r))
                                        scandirr($r, $deny, $result);
                                else
                                        $result[] = $r;
                        }
                }
                ksort($result);
        }
}