如何在没有内容长度的PHP中发送数据？

echo "Hello, World!";

print "Hello, World!";

printf("Hello, %s!", "World");

$message = sprintf("Hello, %s!", "World");
echo $message;

$file = fopen("output.txt", "w");
fwrite($file, "Hello, World!");
fclose($file);

file_put_contents("output.txt", "Hello, World!");

$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_connect($socket, "127.0.0.1", 8080);
socket_write($socket, "Hello, World!");
socket_close($socket);

$fp = fsockopen("127.0.0.1", 8080);
fwrite($fp, "Hello, World!");
fclose($fp);

$fp = stream_socket_client("tcp://127.0.0.1:8080");
fwrite($fp, "Hello, World!");
fclose($fp);

$url = "http://example.com/api";
$data = array("message" => "Hello, World!");
$options = array("method" => "POST", "content" => http_build_query($data));
$context = stream_context_create(array("http" => $options));
$response = file_get_contents($url, false, $context);
echo $response;