[英]PHP Call to undefined method DOMElement
I have wrap class for creating xml file and i dont know how to rewrite add() method to work correctly. 我有用于创建xml文件的包装类,但我不知道如何重写add()方法以使其正常工作。 Variable SHOPITEM should be parent element, but i dont know how to reach it in add method. 变量SHOPITEM应该是父元素,但是我不知道如何在add方法中达到它。
Any advice are welcome 欢迎任何建议
class Items {
const XML_VERSION enter code here= '1.0';
const XML_ENCODING = 'utf-8';
const SHOP = 'SHOP';
private $xml, $xmlElement;
public function __construct() {
$this->xml = new DOMDocument(self::XML_VERSION, self::XML_ENCODING);
//$this->xml->preserveWhiteSpace = false;
$this->xml->formatOutput = true;
$this->xmlElement = $this->create(self::SHOP);
}
public function create($nodeName, $value = null) {
return $this->xml->createElement($nodeName, $value);
}
public function add($object) {
return $this->xmlElement->appendChild($object);
}
public function write() {
$this->xml->appendChild($this->xmlElement);
$this->xml->save("test.xml");
}
}
$items = new Items();
$SHOPITEM = $items->create('SHOPITEM');
$product1 = $items->create('Product1', 'Some value 1');
$product2 = $items->create('Product2', 'Some value 2');
//this wont work
$SHOPITEM->add($product1);
//this works
$items->add($product1);
$items->add($product2);
//this works
$items->add($SHOPITEM);
$items->write();
Your $SHOPITEM
, $product1
and $product2
are instances of newly added node (ie of DOMElement class) because they are result of the statement 您$SHOPITEM
, $product1
和$product2
是新增加节点的情况下(即一个DOMElement类的),因为它们是语句的结果
return $this->xml->createElement($nodeName, $value);
So they just do nat have a method add($object)
that you want to use on them. 因此,它们只是没有要在其上使用的方法add($object)
。
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