PHP Async Example

async.php

<?php

$counter = 1;

function aJob(bool $async, int $pid) {

    sleep(1);
    global $counter;
    echo "Async:" . ($async ? "true" : "false");
    echo " Pid:" . $pid;
    echo " Count:" . $counter++ . "\n";

    return true;
}

$processes = [];

function anAsyncJob() {

    $pid = pcntl_fork();
    if ($pid == -1) {
        die('Process could not be forked');
    }
    elseif ($pid == 0) {
        aJob(true, getmypid());
        posix_kill(getmypid(), SIGKILL);
    }
    else {
        $processes[] = $pid;
    }
}

aJob(false, getmypid());
aJob(false, getmypid());
anAsyncJob();
anAsyncJob();
anAsyncJob();
anAsyncJob();
aJob(false, getmypid());

foreach ($processes as $pid) {

    pcntl_waitpid($pid, $status);
    $status = pcntl_wexitstatus($status);
}

aJob(false, getmypid());