process1.php

<?php
declare(ticks = 1);

function handleExit($signal)
{
    error_log("Caught a $signal signal, a worker process exiting\n", 3, './error-child-log');
    exit(1);
}

pcntl_signal(SIGTERM, 'handleExit');
pcntl_signal(SIGQUIT, 'handleExit');
pcntl_signal(SIGINT, 'handleExit');
pcntl_signal(SIGSTOP, 'handleExit');
pcntl_signal(SIGABRT, 'handleExit');
pcntl_signal(SIGHUP, 'handleExit');

$i = 0;

// Will run in 100 seconds
while ($i < 100)
{
    $i++;
    echo "Running \n.";
    sleep(1);
}

?>

test3.php

#!/usr/local/php5-fcgi/bin/php
<?php

/**
 * Run it: php test3.php
 */

declare(ticks = 1);

function handleChildExit($signal)
{
    echo ("Caught a SIGCHLD signal, a worker process exiting\n");

    while (($pid = pcntl_waitpid(0, $status, WNOHANG)) != - 1)
    {
        if (0 === $pid)
        {
            break;
        }

        if (!pcntl_wifexited($status))
        {
            echo ("Child process $pid killed with status $status\n");
        }
        else
        {            
            echo ("Child process $pid exited with status $status\n");
            echo "Command used ".$status['command']."\n";
            echo "Termination signal: ".$status['termsig']."\n";
            echo "Is stopped: ".$status['stopped']."\n";
            echo "Stop signal: ".$status['stopsig']."\n";
        }
    }
}

// In case worker process exits
pcntl_signal(SIGCHLD, 'handleChildExit');

function start()
{
    $descriptors = array(
        0 => array('pipe', 'r'),
        1 => array('pipe', 'w'),
        2 => array("file", "error-output.txt", "a"));

    $pipes = array();

    // Tested 
    // $process = proc_open('exec /usr/local/php5-fcgi/bin/php process1.php', $descriptors, $pipes);
    $process = proc_open('/usr/local/php5-fcgi/bin/php process1.php', $descriptors, $pipes);

    $status = proc_get_status($process);

    if (true === $status['running'])
    {
        echo "Started process Id\n";
    }
    else
    {
        echo "Unable to start a process\n";
    }

    $i = 0;

    while ($i < 10)
    {
        $status = proc_get_status($process);

        if (true === $status['running'])
        {
            echo "Process Id {$status['pid']} is running\n";
            echo "Command used ".$status['command']."\n";
        }
        else
        {
            echo "Not running\n";
        }

        $i++;
    }

    return array(
        'pid' => $status['pid'],
        'handle' => $process
    );
}

echo "Parent process ID: ".posix_getpid()."\n";
$running = array();
$rs = start();
$running[$rs['pid']] = $rs;

$i = 0;

while ($i < 1000)
{
    foreach ($running as $pid => $info)
    {
        $status = proc_get_status($info['handle']);

        if (true === $status['running'])
        {
            echo "Process $pid is running \n";
        }
        else
        {
            echo "Process $pid is not running \n";
        }
    }

    sleep(1);
}

?>