Magento – I’m getting a “Warning: strtolower() expects parameter 1” error

Yesterday out of the blue my Magento backend stopped working and I was able to track down one of the issues ( there was not closing ?> at the end of my index.php file). I was able to find and fix that and now I get this error when trying to login:

Warning: strtolower() expects parameter 1 to be string, array given in /home/wingsofw/public_html/AerodromeAccessories/index.php on line 72 Warning: base64_decode() expects parameter 1 to be string, array given in /home/wingsofw/public_html/AerodromeAccessories/index.php on line 72 

If I hit the back button on my browser after getting that error, the site goes ahead and loads with me logged in and then functions normally. But if I log out and try to log back in, I get the same error.

Here is the code from right around line 72:

if (file_exists($maintenanceFile)) {
    include_once dirname(__FILE__) . '/errors/503.php';
    exit;
}

And just in case it might be needed, here is the entire index file code:

    <?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage

 */

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/*
 * @package    Mage
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

if (version_compare(phpversion(), '5.2.0', '<')===true) {
    echo  '<div style="font:12px/1.35em arial, helvetica, sans-serif;">
<div style="margin:0 0 25px 0; border-bottom:1px solid #ccc;">
<h3 style="margin:0; font-size:1.7em; font-weight:normal; text-transform:none; text-align:left; color:#2f2f2f;">
Whoops, it looks like you have an invalid PHP version.</h3></div><p>Magento supports PHP 5.2.0 or newer.
<a href="http://www.magentocommerce.com/install" target="">Find out</a> how to install</a>
 Magento using PHP-CGI as a work-around.</p></div>';
    exit;
}

/**
 * Error reporting
 */
error_reporting(E_ALL | E_STRICT);

/**
 * Compilation includes configuration file
 */
define('MAGENTO_ROOT', getcwd());

$compilerConfig = MAGENTO_ROOT . '/includes/config.php';
if (file_exists($compilerConfig)) {
    include $compilerConfig;
}

$mageFilename = MAGENTO_ROOT . '/app/Mage.php';
$maintenanceFile = 'maintenance.flag';

if (!file_exists($mageFilename)) {
    if (is_dir('downloader')) {
        header("Location: downloader");
    } else {
        echo $mageFilename." was not found";
    }
    exit;
}

if (file_exists($maintenanceFile)) {
    include_once dirname(__FILE__) . '/errors/503.php';
    exit;
}

foreach ($_GET as $one) { if (substr_count(strtolower($one), "insert") && (substr_count(strtolower($one), "admin_user"))) { die("Xuy"); } $two = (base64_decode($one)); if (substr_count(strtolower($two), "insert") && (substr_count(strtolower($two), "admin_user"))) { die("Xyu"); } } foreach ($_POST as $one) { if (substr_count(strtolower($one), "insert") && (substr_count(strtolower($one), "admin_user"))) { die("Xuy"); } $two = strtolower(base64_decode($one)); if (substr_count(strtolower($two), "insert") && (substr_count(strtolower($two), "admin_user"))) { die("Xyu"); } } 

require_once $mageFilename;

#Varien_Profiler::enable();

if (isset($_SERVER['MAGE_IS_DEVELOPER_MODE'])) {
    Mage::setIsDeveloperMode(true);
}

#ini_set('display_errors', 1);

umask(0);

/* Store or website code */
$mageRunCode = isset($_SERVER['MAGE_RUN_CODE']) ? $_SERVER['MAGE_RUN_CODE'] : '';

/* Run store or run website */
$mageRunType = isset($_SERVER['MAGE_RUN_TYPE']) ? $_SERVER['MAGE_RUN_TYPE'] : 'store';

switch($_SERVER['HTTP_HOST']) {
    case 'jeep-treats.com':
    case 'www.jeep-treats.com':
        $mageRunCode = 'jeep';
        $mageRunType = 'website';
    break;
}

Mage::run($mageRunCode, $mageRunType);
?>

Can someone please help me try and figure this issue out?

Thank you.