<?php

$a = 10;
$b = 20;
$c = 30;

function tick_handler(){
	global $a, $b, $c;
    printf("%d, %d, %d\n", $a, $b, $c);
}
register_tick_function('tick_handler');
//registrei a função no tick

declare(ticks=1){
   $a++;
   $b++;
   $c++;
}