Scan all files for eval base64 decode string

scan.php

$config = array(
    'dir' => dirname(__FILENAME__),
);

// DO NOT EDIT BELOW THIS LINE!
function output() {
    flush();
    ob_flush();
}

echo '<h1>EVALBASE64DECODE Malware Detector</h1><p>Please wait, we are currently searching for possible infected files...</p><br /><hr /><br />';
output();

$string = 'eval(base64_decode(';

$dir = new DirectoryIterator($config['dir']);
foreach ($dir as $file) {
    $content = file_get_contents($file->getPathname());
    if (strpos($content, $string) !== false) {
        echo '<p>Possible Infection Found:&nbsp;'.$file->getPathname().'</p>';
        output();
    }
}

$dir = $config['dir'];
foreach (glob("$dir/*") as $file) {
    $content = file_get_contents("$dir/$file");
    if (strpos($content, $string) !== false) {
        echo '<p>Possible Infection Found:&nbsp;'."$dir/$file".'</p>';
        output();
    }
}