react/stream

error.log

PHP Fatal error:  Uncaught ValueError: No stream arrays were passed in vendor/react/event-loop/src/StreamSelectLoop.php:290
Stack trace:
#0 vendor/react/event-loop/src/StreamSelectLoop.php(290): stream_select()
#1 vendor/react/event-loop/src/StreamSelectLoop.php(231): React\EventLoop\StreamSelectLoop->streamSelect()
#2 vendor/react/event-loop/src/StreamSelectLoop.php(212): React\EventLoop\StreamSelectLoop->waitForStreamActivity()
#3 vendor/react/event-loop/src/Loop.php(55): React\EventLoop\StreamSelectLoop->run()
#4 [internal function]: React\EventLoop\Loop::React\EventLoop\{closure}()
#5 {main}
  thrown in vendor/react/event-loop/src/StreamSelectLoop.php on line 290

stream.php

<?php

use React\Stream\ReadableResourceStream;
use React\Stream\WritableResourceStream;

function wrapper()
{
    $resource = fopen('php://memory', 'r+');

    $buffer = new ReadableResourceStream($resource);
    $buffer->on('data', function ($chunk) {
        var_dump($chunk);
    });

    $stream = new WritableResourceStream($resource);
    $stream->on('close', function () use ($buffer) {
        $buffer->close();
    });
    return $stream;
}

$write = wrapper();
$write->write('foo');