Handle signals by dispatcher or ticks

signal.php

<?php

/* START: Handle by ticks */
declare(ticks=1);
function tick_handler() { echo "T"; }
register_tick_function('tick_handler');
/* END: Handle by ticks */

// register handler for all signals
for ($sig = 0; $sig <=32; $sig++) {
    pcntl_signal($sig, function($sig) {
        echo "Signal" . $sig;
    });
}

// start main loop
while(true) {
    /* START: Handle by signal dispatch */
    pcntl_signal_dispatch();
    /* END: Handle by signal dispatch */
    echo '.';
    sleep(1);
    echo '-';
    sleep(1);
    echo '-';
    sleep(1);
    echo '-';
    sleep(1);
    echo '-';
    sleep(1);
}

SignalHandler.php

<?php

class SignalHandler
{
    /**
     * @var bool
     */
    private $isRunning;

    /**
     * @param \Closure|null $callback
     */
    public function __construct(\Closure $callback = null)
    {
        if (php_sapi_name() === 'cli') {
            $handle = function ($signal) use ($callback) {
                $this->isRunning = false;
                if ($callback) {
                    call_user_func_array($callback, [$signal]);
                }
            };

            pcntl_signal(SIGINT, $handle);
            pcntl_signal(SIGTERM, $handle);
            pcntl_signal(SIGHUP, $handle);
            pcntl_signal(SIGUSR1, $handle);
        }
        $this->isRunning = true;
    }

    /**
     * @return bool
     */
    public function isRunning(): bool
    {
        if (php_sapi_name() === 'cli') {
            pcntl_signal_dispatch();
        }

        return $this->isRunning;
    }
}