PHP8.1 Fiber

 

function writeToLog(string $message): void {
    echo $message . "\n";
}
$files = [
    'src/foo.jpg' => 'dest/foo.jpg',
    'src/bar.jpg' => 'dest/bar.jpg',
    'src/baz.jpg' => 'dest/baz.jpg',
];

$fiber = new Fiber(function(array $files): void {
    foreach($files as $source => $destination) {
        copy($source, $destination);
        Fiber::suspend([$source, $destination]);
    }
});

// Pass the files list into Fiber.
$copied = $fiber->start($files);
$copied_count = 1;
$total_count  = count($files);

while(!$fiber->isTerminated()) {
    $percentage = round($copied_count / $total_count, 2) * 100;
    writeToLog("[{$percentage}%]: Copied '{$copied[0]}' to '{$copied[1]}'");
    $copied = $fiber->resume();
    ++$copied_count;
}

writeToLog('Completed');

 

//調度器
$reg = [];
$fId = 1;

$reg[$fId] = new \Fiber(function () use (&$reg, $fId) {
    for ($i = 1; $i < 10; $i++) {
        echo $fId . ':' . $i;
        echo PHP_EOL;
        if ($i % 3 == 0) {
            \Fiber::suspend();
        }
    }
    unset($reg[$fId]);
});
$fId++;

$reg[$fId] = new \Fiber(function () use (&$reg, $fId) {
    for ($i = 1; $i < 10; $i++) {
        echo $fId . ':' . $i;
        echo PHP_EOL;
        \Fiber::suspend();
    }
    unset($reg[$fId]);
});

$startTag = true;
while (count($reg) > 0) {
    if ($startTag){
        foreach ($reg as $pI) {
            $pI->start();
            $startTag = false;
        }
        
    }
    foreach ($reg as $pI) {
        $pI->resume();
    }
}

 

$fiber = new Fiber(function(string $str) {
    echo "{$str}\n";
    $out = Fiber::suspend(20);
    echo "fiber_in {$out} \n";
    echo "Resumed!\n";
});
$in = $fiber->start("hello");
echo "fiber_out {$in} \n"; 
echo "Resuming...\n";
$fiber->resume(30);

 

<?php

class EventLoop
{
    private string $nextId = 'a';
    private array $deferCallbacks = [];
    private array $read = [];
    private array $streamCallbacks = [];

    public function run(): void
    {
        while (!empty($this->deferCallbacks) || !empty($this->read)) {
            $defers = $this->deferCallbacks;
            $this->deferCallbacks = [];
            foreach ($defers as $id => $defer) {
                $defer();
            }

            $this->select($this->read);
        }
    }

    private function select(array $read): void
    {
        $timeout = empty($this->deferCallbacks) ? null : 0;
        // stream_select https://cloud.tencent.com/developer/section/1344784
        if (!stream_select($read, $write, $except, $timeout, $timeout)) {
            return;
        }

        foreach ($read as $id => $resource) {
            $callback = $this->streamCallbacks[$id];
            unset($this->read[$id], $this->streamCallbacks[$id]);
            $callback($resource);
        }
    }
    public function defer(callable $callback): void
    {
        $id = $this->nextId++;
        $this->deferCallbacks[$id] = $callback;
    }

    public function read($resource, callable $callback): void
    {
        $id = $this->nextId++;
        $this->read[$id] = $resource;
        $this->streamCallbacks[$id] = $callback;
    }
}

[$read, $write] = stream_socket_pair(
    stripos(PHP_OS, 'win') === 0 ? STREAM_PF_INET : STREAM_PF_UNIX,
    STREAM_SOCK_STREAM,
    STREAM_IPPROTO_IP
);

// Set streams to non-blocking mode.
stream_set_blocking($read, false);
stream_set_blocking($write, false);

$loop = new EventLoop;

// Read data in a separate fiber after checking if the stream is readable.
$fiber = new Fiber(function () use ($loop, $read): void {
    echo "Waiting for data...\n";

    $fiber = Fiber::getCurrent();
    $loop->read($read, fn() => $fiber->resume());
    Fiber::suspend();

    $data = fread($read, 8192);

    echo "Received data: ", $data, "\n";
});

// Start the fiber, which will suspend while waiting for a read event.
$loop->defer(fn() => $fiber->start());

// Defer writing data to an event loop callback.
$loop->defer(fn() => fwrite($write, "Hello, world!"));

// Run the event loop.
$loop->run();

 

 

參考 https://php.watch/versions/8.1/fibers

https://juejin.cn/post/6993613191955611684