Request to telegram API asynchronous from php (2 times faster than normal request)

asyncApiRequest.php

<?php
/**
 * Created by PhpStorm.
 * User: amirsbss
 * Date: 11/3/18
 * Time: 1:08 AM
 */
define('BOT_TOKEN', 'TOKEN');
define('API_URL', 'https://api.telegram.org/bot'.BOT_TOKEN.'/');
function multipartFormData($data=[], $files=[])
{
    $eol = "\r\n";

    // Build test string
    $testStr = '';
    array_walk_recursive($data, function($item, $key) use (&$testStr, &$eol) {
        $testStr .= $key . $eol . $item . $eol;
    });

    // Get file content type and content.  Add to test string
    $finfo = finfo_open(FILEINFO_MIME_TYPE);
    $fileContent = array();
    $fileContentTypes = array();
    foreach ($files as $key=>$filename)
    {
        $fileContent[$key] = file_get_contents($filename);
        $fileContentTypes[$key] = finfo_file($finfo, $filename);
        $testStr .= $key . $eol . $fileContentTypes[$key] . $eol. $fileContent[$key] . $eol;
    }
    finfo_close($finfo);

    // Find a boundary not present in the test string
    $boundaryLen = 6;
    $alpha = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    do {
        $boundary = '--';
        for ($i = 0; $i < $boundaryLen; $i++)
        {
            $c = rand(0, 61);
            $boundary .= $alpha[$c];
        }

        // Check test string
        if (strpos($testStr, $boundary) !== false)
        {
            $boundary = null;
            $boundaryLen++;
        }
    } while ($boundary === null);
    unset($testStr);

    // Build data
    $rtn = '';
    $func = function($data, $baseKey = null) use (&$func, &$boundary, &$eol)
    {
        $rtn = '';
        foreach ($data as $key=>&$value)
        {
            // Get key
            $key = $baseKey === null ? $key : ($baseKey . '[' . $key . ']');

            // Add data
            if (is_array($value))
                $rtn .= $func($value, $key);
            else
                $rtn .= '--' . $boundary . $eol . 'Content-Disposition: form-data; name="'.$key.'"' . $eol . $eol . $value . $eol;
        }

        return $rtn;
    };
    $rtn = $func($data);

    // Add files
    foreach ($files as $key=>$filename)
    {
        $rtn .= '--' . $boundary . $eol . 'Content-Disposition: form-data; name="'.$key.'"; filename="'.basename($filename).'"' . $eol
            . 'Content-Type: ' . $fileContentTypes[$key] . $eol
            . 'Content-Transfer-Encoding: binary' . $eol . $eol
            . $fileContent[$key] . $eol;
    }

    return [$rtn . '--' . $boundary . '--' . $eol, 'multipart/form-data, boundary='.$boundary];
}
function asyncApiRequest($method, $params, $files=[])
{
    if (count($files) == 0) {
        $post_string = json_encode($params);
        $content_type = "application/json";

    } else {
        list($post_string, $content_type) = multipartFormData($params, $files);
    }
    $path = "/bot".BOT_TOKEN."/".$method;
    $fp = fsockopen("ssl://api.telegram.org",443,$errno, $errstr, 30);
    $out = "POST $path HTTP/1.1\r\n";
    $out.= "Host: api.telegram.org\r\n";
    $out.= "Content-Type: $content_type\r\n";
    $out.= "Content-Length: ".strlen($post_string)."\r\n";
    $out.= "Connection: Close\r\n\r\n";
    if (isset($post_string)) $out.= $post_string;
    fwrite($fp, $out);
    fclose($fp);
}

// Send normal data (texts)
asyncApiRequest("sendMessage", ["chat_id"=>123456789, "text"=>"Hello!"]);
// Send files
asyncApiRequest("sendDocument", ["chat_id"=>123456789], ["document"=>$filename]);

how do I retrieve the information: CHAT_ID, MESSAGE ID, FIRSTNAME ETC...) using its base structure?