nur-sery/wip/php/access/AbstractAccess.php

<?php
namespace nur\sery\wip\php\access;

use nur\sery\cl;

abstract class AbstractAccess implements IAccess {
  function inc(): int {
    $value = (int)$this->get();
    $this->set(++$value);
    return $value;
  }

  function dec(bool $allowNegative=false): int {
    $value = (int)$this->get();
    if ($allowNegative || $value > 0) {
      $this->set(--$value);
    }
    return $value;
  }

  function merge(?array $values): void {
    $array = $this->get();
    $array = cl::merge($array, $values);
    $this->set($array);
  }

  function append($value, $key=null): void {
    $array = $this->get();
    cl::set($array, $key, $value);
    $this->set($array);
  }
}