async.php

<?php

declare(ticks=10);

// A function called on each tick event
class Counter {
    static $a = 0;
    static $b = 0;
}

function tick_handler()
{
    Counter::$b++;
}

$stream1 = fopen("http://amazon.com", "r");
$stream2 = fopen("http://news.ycombinator.com", "r");

stream_set_blocking($stream1, 0);
stream_set_blocking($stream2, 0);
register_tick_function('tick_handler', 1);
$read   = array($stream1, $stream2);
$write  = NULL;
$except = NULL;
while (True){
    $line = fgets($stream2);
    if ($line == "") {
        Counter::$a++;
    } else {
        break;
    }
}
echo Counter::$a."\n".Counter::$b."\n";
fclose($stream1);
fclose($stream2);