/**
 * @return mixed
 */
function parse_source_mail_data()
{
    $data = [];
    $resource = fopen("php://stdin", "r");
    // for xDebug
    // $resource   = fopen(__DIR__."/mails/bogdan.mail", "r");
    $mailParser = new ZBateson\MailMimeParser\MailMimeParser();
    $message = $mailParser->parse($resource);
    try {
        $data['parser_message'] = $message;
        $data['to'] = $message->getHeaderValue('to');
        $data['to_name'] = is_object($message->getHeader('to')) ? $message->getHeader('to')->getPersonName() : '';
        $data['from'] = $message->getHeaderValue('from');
        $data['from_name'] = is_object($message->getHeader('from')) ? $message->getHeader('from')->getPersonName() : '';
        $data['subject'] = $message->getHeaderValue('subject');
        $data['content'] = stream_get_contents($message->getTextStream());
        $data['content_html'] = stream_get_contents($message->getHtmlStream());
        $data['files_count'] = $message->getAttachmentCount();
        //$data['all_attachment_parts'] = (is_numeric($data['files_count']) && $data['files_count'] > 0)
        //                        ? $message->getAllAttachmentParts()
        //                        : false;
    } catch (Exception $error) {
        loger_error("Line: " . __LINE__ . "; Error parse source stdin resource. Message error: " . $error->getMessage());
    }
    fclose($resource);
    $_d['content'] = $data['content'];
    $_d['content_html'] = $data['content_html'];
    //loger('Source data: '. print_r($_d, true));
    return $data;
}
<?php

include __DIR__ . "/ZBateson/MailMimeParser/MailMimeParser.php";
function __autoload($classname)
{
    if (strpos($classname, "ZBateson") !== false) {
        $filename = __DIR__ . "/" . str_replace("\\", "/", $classname) . ".php";
    }
    include_once $filename;
}
$path = realpath(dirname(dirname(dirname(__DIR__))));
// we've called a class ***
//$obj = new myClass();
$mailParser = new ZBateson\MailMimeParser\MailMimeParser();
$handle = fopen(__DIR__ . '/tester-group.mail', 'r');
//if (strlen($msg) > 1000) {
$message = $mailParser->parse($handle);
// returns a ZBateson\MailMimeParser\Message
fclose($handle);
$to = $message->getHeaderValue('to');
$toName = $message->getHeader('to')->getPersonName();
$from = $message->getHeaderValue('from');
// user@example.com
$fromName = $message->getHeader('from')->getPersonName();
// Person Name
$subject = $message->getHeaderValue('subject');
// The email's subject
$res = $message->getTextStream();
// or getHtmlStream
$content = stream_get_contents($res);
if ($att = $message->getAttachmentPart(0)) {