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

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

use ArrayAccess;
use nur\sery\cl;

/**
 * Class KeyAccess: accès à une valeur d'un tableau
 */
class KeyAccess extends AbstractAccess {
  function __construct(&$dest, $key) {
    $this->dest =& $dest;
    $this->key = $key;
  }

  /** @var array|ArrayAccess */
  protected $dest;

  /** @var int|string */
  protected $key;

  function exists(): bool {
    return $this->key !== null && cl::has($this->dest, $this->key);
  }

  function available(): bool {
    return $this->exists() && $this->get() !== false;
  }

  function get($default=null) {
    if ($this->key === null) return $default;
    return cl::get($this->dest, $this->key, $default);
  }

  function set($value): void {
    if ($this->key === null) return;
    cl::set($this->dest, $this->key, $value);
  }

  function del(): void {
    if ($this->key === null) return;
    cl::del($this->dest, $this->key);
  }
}