guzzle.php

<?php

$client = new GuzzleHttp\Client();

$response = $client->request('POST', 'http://localhost:8000/hello/world', [
    'form_params' => [
        'name' => 'Norbert',
    ],
    'timeout' => 30,
]);

echo $response->getBody();

sockets.php

<?php

$socket = fsockopen("localhost", 8000, $errno, $errstr, 30);

if (!$socket) {
    echo "$errstr ($errno)<br />\n";
} else {
	$post_data = "name=Norbert";
	
	$http  = "POST /hello/world HTTP/1.1\r\n";
	$http .= "Host: localhost\r\n";
	$http .= "User-Agent: " . $_SERVER['HTTP_USER_AGENT'] . "\r\n";
	$http .= "Content-Type: application/x-www-form-urlencoded\r\n";
	$http .= "Content-length: " . strlen($post_data) . "\r\n";
	$http .= "Connection: close\r\n\r\n";
	$http .= $post_data . "\r\n\r\n";
	
	fwrite($socket, $http);
	
	$contents="";
	
	while (!feof($socket)) {
		$contents .= fgets($socket, 4096);
	}
}

fclose($socket);

echo $contents;