php-linux-gpio/examples/tickhandler.php

<?php

require_once __DIR__."/../vendor/autoload.php";
require_once __DIR__."/GLOBALS.php";

/*
 * This example demonstrate a possibility, but not a best practice. When using
 * the tick handler, make sure the code being executed has ticks declared.
 *
 */

use NoccyLabs\Gpio\Gpio;
use NoccyLabs\Gpio\GpioTickHandler;

$gpio = new Gpio(true);

$gpiotick = new GpioTickHandler();
$gpiotick->registerGpio($gpio);

declare(ticks=5);

while(true) {
    usleep(10000);
}