# The SimpleXMLElement class

(PHP 8)

## 简介

Represents an element in an XML document.

## 类摘要

class SimpleXMLElement implements Stringable, Countable, RecursiveIterator {
/* 方法 */
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 current(): SimpleXMLElement
public getDocNamespaces(bool `$recursive` = `false`, bool `$fromRoot` = `true`): array|false
public getName(): string
public getNamespaces(bool `$recursive` = `false`): array
public getChildren(): ?SimpleXMLElement
public hasChildren(): bool
public key(): string
public next(): void
public registerXPathNamespace(string `$prefix`, string `$namespace`): bool
public rewind(): void
public __toString(): string
public valid(): bool
public xpath(string `$expression`): array|null|false
}

## 更新日志

版本 | 说明
--- | ---
8.0.0 | SimpleXMLElement implements Stringable, Countable, and RecursiveIterator now.

## 目录

- SimpleXMLElement::addAttribute — Adds an attribute to the SimpleXML element
- SimpleXMLElement::addChild — Adds a child element to the XML node
- SimpleXMLElement::asXML — Return a well-formed XML string based on SimpleXML element
- SimpleXMLElement::attributes — Identifies an element's attributes
- SimpleXMLElement::children — Finds children of given node
- SimpleXMLElement::__construct — Creates a new SimpleXMLElement object
- SimpleXMLElement::count — Counts the children of an element
- SimpleXMLElement::current — Returns the current element
- SimpleXMLElement::getDocNamespaces — Returns namespaces declared in document
- SimpleXMLElement::getName — Gets the name of the XML element
- SimpleXMLElement::getNamespaces — Returns namespaces used in document
- SimpleXMLElement::getChildren — Returns the sub-elements of the current element
- SimpleXMLElement::hasChildren — Checks whether the current element has sub elements
- SimpleXMLElement::key — Return current key
- SimpleXMLElement::next — Move to next element
- SimpleXMLElement::registerXPathNamespace — Creates a prefix/ns context for the next XPath query
- SimpleXMLElement::rewind — Rewind to the first element
- SimpleXMLElement::saveXML — 别名 SimpleXMLElement::asXML
- SimpleXMLElement::__toString — Returns the string content
- SimpleXMLElement::valid — Check whether the current element is valid
- SimpleXMLElement::xpath — Runs XPath query on XML data

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