pecm/pickling

Similar blocks of code found in 2 locations. Consider refactoring.
<?php
declare(strict_types = 1);
 
namespace Pickling\Resource;
 
use ArrayAccess;
use Countable;
use Iterator;
use SimpleXMLElement;
 
final class CategoryList implements ArrayAccess, Countable, Iterator {
  private string $channel;
  /**
   * @var string[]
   */
  private array $list = [];
 
  public function __construct(SimpleXMLElement $xml) {
    $this->channel = trim((string)$xml->ch);
 
    foreach ($xml->c as $category) {
      $this->list[] = trim((string)$category);
    }
  }
 
  public function getChannel(): string {
    return $this->channel;
  }
 
  public function offsetExists($offset): bool {
    return isset($this->list[$offset]);
  }
 
  public function offsetGet($offset): ?string {
    return isset($this->list[$offset]) ? $this->list[$offset] : null;
  }
 
  public function offsetSet($offset, $value): void {
    // no-op as the package list must be immutable
  }
 
  public function offsetUnset($offset): void {
    // no-op as the package list must be immutable
  }
 
  public function count(): int {
    return count($this->list);
  }
 
  public function current(): string {
    return (string)current($this->list);
  }
 
  public function key(): int {
    return (int)key($this->list);
  }
 
  public function next(): void {
    next($this->list);
  }
 
  public function rewind(): void {
    reset($this->list);
  }
 
  public function valid(): bool {
    $key = key($this->list);
 
    return ($key !== null && $key !== false);
  }
}