xyzshop/test/examples/runtime/stream.php

<?php
go(function () {
    Swoole\Runtime::enableCoroutine();
    $fp = stream_socket_client("tcp://www.baidu.com:80", $errno, $errstr, 30);
    if (!$fp) {
        echo "$errstr ($errno)<br />\n";
    } else {
        fwrite($fp, "GET / HTTP/1.0\r\nHost: www.baidu.com\r\nAccept: */*\r\n\r\n");
        while (!feof($fp)) {
            echo fgets($fp, 1024);
        }
        fclose($fp);
    }
});