PHP SimpleXMLElement class

class SimpleXMLElement implements Traversable {
  //Methods
  public __construct(
      string $data,
      int $options = 0,
      bool $dataIsURL = false,
      string $namespaceOrPrefix = "",
      bool $isPrefix = false
  )
  public addAttribute(string $qualifiedName, string $value, 
                      ?string $namespace = null): void
  public addChild(string $qualifiedName, ?string $value = null, 
                  ?string $namespace = null): ?SimpleXMLElement
  public asXML(?string $filename = null): string|bool
  public attributes(?string $namespaceOrPrefix = null, 
                    bool $isPrefix = false): ?SimpleXMLElement
  public children(?string $namespaceOrPrefix = null, 
                  bool $isPrefix = false): ?SimpleXMLElement
  public count(): int
  public getDocNamespaces(bool $recursive = false, 
                          bool $fromRoot = true): array|false
  public getName(): string
  public getNamespaces(bool $recursive = false): array
  public registerXPathNamespace(string $prefix, 
                                string $namespace): bool
  public __toString(): string
  public xpath(string $expression): array|null|false
}