Capturar los datos del registro de un dominio | Whois

//Types of input 
$typesOfInput = array("Registrant", "Admin", "Tech");
$typesOfAttributes = array("Name:", "Organization:", "Street:", "City:", "State/Province:", "Postal Code:", "Phone:", "Phone Ext:", "Email:");
$output = array();
function get_item($output, $request) {
	$count = strlen($request);
	if (strpos($output, $request) !== false) {
		$temp = substr($output, strpos($output,$request)+$count);
		$payload = substr($output, strpos($output, $request)+$count, strpos($temp,'"'));
		return $payload;
	} else {
		return '';
	}
}
$i = 0;
$websitesToBeAnalyzed = array('prestashop.com',
'prestafox.com');
 
foreach ($websitesToBeAnalyzed as $key => $value) {
 	$website = $value;
	$command = "whois $website";
	exec($command, $output, $exit_code);
	$output = json_encode($output);
	$registrantEmail = get_item($output,"Registrant Email:");
	$registrantName = get_item($output,"Registrant Name:");
	$registrantStreet = get_item($output,"Registrant Street:");
	$registrantCity = get_item($output,"Registrant City:");
	$registrantState = get_item($output,"Registrant State/Province:");
	$registrantTelephone = get_item($output,"Registrant Phone:");
	$administrativeEmail =  get_item($output,"Admin Email:");
 
	$technicalEmail =  get_item($output,"Tech Email:");;
 
	$additionalEmails = '';
	if ($administrativeEmail !== $registrantEmail) {
		$additionalEmails = $additionalEmails . $administrativeEmail;
	}
	if ($technicalEmail !== $registrantEmail) {
		$additionalEmails = $additionalEmails . $technicalEmail;
	}
 
 
 
	echo "$i - El email de $website es $registrantEmail, el nombre del registro es $registrantName, el telefono es $registrantTelephone, los emails extra encontrados son $additionalEmails <br>";
 
	$i++;	
 
	//Allows the response to be outputted whil script runs & throttles number of requests
	flush();
	ob_flush();
	usleep(rand(2000000,4000000));
}