gistfile1.php

$counter = new RedisString("key");
$counter(-1); // decr 1
$counter(+1); // incr 1
$counter(+2); // incr 2

$counter = new RedisString("key");
$counter->decr();
$counter->incr();
$counter->incr(2);

$counter = new RedisString("key");
$counter->v--;
$counter->v++;
$counter->v += 2;