导入到另一个文档时，扩展的DOMElement对象会丢失它的属性
将具有特定属性的扩展DOMElement对象导入另一个DOMDocument而不是使用所有属性创建的那个DOMDocument时（我猜它实际上不会复制no，但是为另一个文档创建了一个新节点，而只是为其创建了值DOMElement类被复制到新节点）。在导入的元素中仍然可以使用属性的最佳方法是什么？
这是一个问题的例子：
<?php
class DOMExtendedElement extends DOMElement {
private $itsVerySpecialProperty;
public function setVerySpecialProperty($property) {$this->itsVerySpecialProperty = $property;}
}
// First document
$firstDocument = new DOMDocument();
$firstDocument->registerNodeClass("DOMElement", "DOMExtendedElement");
$elm = $firstDocument->createElement("elm");
$elm->setVerySpecialProperty("Hello World!");
var_dump($elm);
// Second document
$secondDocument = new DOMDocument();
var_dump($secondDocument->importNode($elm, true)); // The imported element is a DOMElement and doesn't have any other properties at all
// Third document
$thirdDocument = new DOMDocument();
$thirdDocument->registerNodeClass("DOMElement", "DOMExtendedElement");
var_dump($thirdDocument->importNode($elm, true)); // The imported element is a DOMExtendedElement and does have the extra property but it's empty
?>
没有找到相关结果
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慰泥悍瓶
第一个对象class DOMExtendedElement extends DOMElement { private $itsVerySpecialProperty; public function setVerySpecialProperty($property) {$this->itsVerySpecialProperty = $property;} public function getVerySpecialProperty(){ return isset($this->itsVerySpecialProperty) ?: ''; } } // First document $firstDocument = new DOMDocument(); $firstDocument->registerNodeClass("DOMElement", "DOMExtendedElement"); $elm = $firstDocument->createElement("elm"); $elm->setVerySpecialProperty("Hello World!"); var_dump($elm); $elm2 = clone $elm; // Third document $thirdDocument = new DOMDocument(); $thirdDocument->registerNodeClass("DOMElement", "DOMExtendedElement"); $thirdDocument->importNode($elm2); var_dump($elm2);object(DOMExtendedElement)#2 (1) { ["itsVerySpecialProperty:private"]=> string(12) "Hello World!" } object(DOMExtendedElement)#3 (1) { ["itsVerySpecialProperty:private"]=> string(12) "Hello World!" }