PHP DOMDocument XML生成优化：链式调用与复用策略

$dom  = new DOMDocument();
$root = $dom->createElement('Root');

// 传统方式：多次调用 appendChild()
$root->appendChild($product);
$root->appendChild($quantity);
$root->appendChild($measureUnit);
$root->appendChild($lineNumber);

$dom->appendChild($root);
$dom->save('/some/dir/some-name.xml');

<?php
$document = new DOMDocument('1.0', 'UTF-8');
// 嵌套 createElement 在 appendChild 内部，并存储根节点
$document->appendChild(
    $root = $document->createElement('root')
);

// 链式调用：创建 product 节点并直接设置其文本内容
$root
  ->appendChild($document->createElement('product'))
  ->textContent = 'ExampleProduct';

// 链式调用：创建 description 节点，并为其添加一个子节点
$root
    ->appendChild($document->createElement('description'))
    ->appendChild($document->createElement('detail'))
    ->textContent = 'Detailed description here.';

$document->formatOutput = true; // 格式化输出，提高可读性
echo $document->saveXML();
?>

<?xml version="1.0" encoding="UTF-8"?>
<root>
  <product>ExampleProduct</product>
  <description>
    <detail>Detailed description here.</detail>
  </description>
</root>

<?php
$document = new DOMDocument('1.0', 'UTF-8');
$document->appendChild(
    $root = $document->createElement('root')
);

// 使用 append() 方法一次性添加多个子节点
$root->append(
    $product = $document->createElement('product'),
    $quantity = $document->createElement('quantity'),
    $measureUnit = $document->createElement('measureUnit')
);

// 分别设置这些节点的文本内容
$product->textContent = 'Example Product A';
$quantity->textContent = '42';
$measureUnit->textContent = 'cm';

// 也可以直接添加文本内容
$root->append(
    $document->createElement('comment'),
    'This is a direct text comment.'
);

$document->formatOutput = true;
echo $document->saveXML();
?>

<?xml version="1.0" encoding="UTF-8"?>
<root>
  <product>Example Product A</product>
  <quantity>42</quantity>
  <measureUnit>cm</measureUnit>
  <comment/>This is a direct text comment.
</root>

<?php
interface XMLAppendable {
    /**
     * 将当前对象表示的XML结构附加到给定的父DOMElement。
     * @param DOMElement $parent 要附加到的父节点。
     */
    public function appendTo(DOMElement $parent): void;
}
?>

<?php
class YourXMLPart implements XMLAppendable {
    private string $_product;
    private string $_unit;
    private int $_quantity;

    public function __construct(string $product, string $unit, int $quantity) {
        $this->_product = $product;
        $this->_unit = $unit;
        $this->_quantity = $quantity;
    }

    public function appendTo(DOMElement $parent): void {
        $document = $parent->ownerDocument; // 获取所属的 DOMDocument 实例

        // 使用链式调用创建并设置子节点
        $parent
            ->appendChild($document->createElement('product'))
            ->textContent = $this->_product;
        $parent
            ->appendChild($document->createElement('measureUnit'))
            ->textContent = $this->_unit;
        $parent
            ->appendChild($document->createElement('quantity'))
            ->textContent = $this->_quantity;
    }
}
?>

<?php
// ... (XMLAppendable 接口和 YourXMLPart 类的定义) ...

$document = new DOMDocument('1.0', 'UTF-8');
$document->appendChild(
    $root = $document->createElement('root')
);

// 创建一个产品XML部件实例
$part = new YourXMLPart('Example Item B', 'kg', 10);
// 将该部件附加到根节点
$part->appendTo($root);

// 可以创建另一个产品实例
$anotherPart = new YourXMLPart('Example Item C', 'piece', 5);
$anotherPart->appendTo($root);


$document->formatOutput = true;
echo $document->saveXML();
?>

<?xml version="1.0" encoding="UTF-8"?>
<root>
  <product>Example Item B</product>
  <measureUnit>kg</measureUnit>
  <quantity>10</quantity>
  <product>Example Item C</product>
  <measureUnit>piece</measureUnit>
  <quantity>5</quantity>
</root>