io.php

<?php

$streamList = [
    stream_socket_client('tcp://localhost:8080'),
    stream_socket_client('tcp://localhost:8001'),
    fopen('arquivo.txt','r'),
    fopen('arquivo2.txt','r'),
];
fwrite($streamList[0],'GET /http-server.php HTTP/1.1' . PHP_EOL . PHP_EOL);

foreach($streamList as $stream){
    stream_set_blocking($stream,false);
}
do {
    $copyReadStream = $streamList;
    $numeroDeStreams = stream_select($copyReadStream,$write,$except,0,200000);

    if($numeroDeStreams === 0){
        continue;
    }

    foreach ($copyReadStream as $key => $stream){
        $conteudo = stream_get_contents($stream);
        $posicaoFimHttp = strpos($conteudo, "\r\n\r\n");
        if($posicaoFimHttp !== false){
            echo substr($conteudo, $posicaoFimHttp + 4);
        }else{
            echo $conteudo;
        }
        unset($streamList[$key]);
    }


} while (!empty($streamList));

echo "Li todos" . PHP_EOL;