Redirect request from Google Home to Google Apps Script and pass back the result

GoogleHomeRedirect.php

<?php
function http_post($url, $data)
{
	$data_url=$data;
    $data_len = strlen ($data_url);
     return array ('content'=>file_get_contents ($url, false, stream_context_create (array ('http'=>array ('method'=>'POST'
            ,'header'  => "Content-type: application/x-www-form-urlencoded\r\n"
            , 'content'=>$data_url
            ))))
        , 'headers'=>$http_response_header
        ); 
		     return array ('content'=>file_get_contents ($url, false, stream_context_create (array ('http'=>array ('method'=>'POST'
            , 'header'=>"Connection: close\r\nContent-Length: $data_len\r\n"
            , 'content'=>$data_url
            ))))
        , 'headers'=>$http_response_header
        ); 
}

header('Content-type: application/json');
$post=file_get_contents('php://input');

$data2=http_post('https://script.google.com/macros/s/<<SCRIPTKEY>>/exec',$post);


echo $data2['content'];

?>