gistfile1.txt

<?php

class Timeout extends \RuntimeException {

}

function setRequestTimeout($timeout) {
        $start = microtime(true);
        register_tick_function(function () use ($start, $timeout) {
                print microtime(true) - $start . " ";
                print "tick\n";
                if (microtime(true) - $start > $timeout) {
                        throw new Timeout();
                }
        });
}

declare(ticks=100);
setRequestTimeout(5);

$i = 0;
while (true) {
        print $i++;
        print "\n";
        usleep(100000);
}