PHP DOM textContent vs nodeValue？
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PHP DOM textContent vs nodeValue?
提问by Xeoncross
PHP DOMnode objects contain a textContentand nodeValueattributes which both seem to be the innerHTML of the node.
PHP DOMnode 对象包含一个textContent和nodeValue属性，它们似乎都是节点的innerHTML。
nodeValue: The value of this node, depending on its type
textContent: This attribute returns the text content of this node and its descendants.
nodeValue：此节点的值，取决于其类型
textContent：此属性返回此节点及其后代的文本内容。
What is the difference between these two properties? When is it proper to use one instead of the other?
这两个属性有什么区别？什么时候使用一个而不是另一个合适？
采纳答案by Ja?ck
I finally wanted to know the difference as well, so I dug into the sourceand found the answer; in most cases there will be no discernible difference, but there are a bunch of edge cases you should be aware of.
我终于也想知道有什么区别了，所以我挖了来源，找到了答案；在大多数情况下，不会有明显的区别，但是您应该注意一些边缘情况。
Both ->nodeValueand ->textContentare identical for the following classes (node types):
对于以下类（节点类型），两者->nodeValue和->textContent都是相同的：
The ->nodeValueproperty yields NULLfor the following classes (node types):
该->nodeValue属性NULL为以下类（节点类型）产生：
The ->textContentproperty is non-existent for the following classes:
->textContent以下类不存在该属性：
DOMNameSpaceNode(not documented, but can be found with//namespace:*selector)
DOMNameSpaceNode（未记录，但可以通过//namespace:*选择器找到）
The ->nodeValueproperty is non-existent for the following classes:
->nodeValue以下类不存在该属性：
See also: dom_node_node_value_read()and dom_node_text_content_read()
回答by mikespook
Hope this will make sense:
希望这会有意义：
$doc = DOMDocument::loadXML('<body><!-- test --><node attr="test1">old content<h1>test</h1></node></body>');
var_dump($doc->textContent);
var_dump($doc->nodeValue);
var_dump($doc->firstChild->textContent);
var_dump($doc->firstChild->nodeValue);
Output:
输出：
string(15) "old contenttest"
NULL
string(15) "old contenttest"
string(15) "old contenttest"
Because: nodeValue - The value of this node, depending on its type
回答by Adam Leggett
Both textContentand nodeValuereturn unescaped text; i.e. <becomes <.
双方textContent并nodeValue返回转义文本; 即<变成<.
textContentconcatenates together all of the content of all children. This is an important distinction; for example, in Chrome the maximum length of nodeValueis 65536 characters (not bytes); if you have already set the content of a node to something longer than that you will need to iterate child nodes if you want to use nodeValuewhereas textContentwill perform the concatenation for you.
textContent将所有子项的所有内容连接在一起。这是一个重要的区别; 例如，在 Chrome 中，最大长度nodeValue为 65536 个字符（不是字节）；如果您已经将节点的内容设置为比该内容更长的内容，如果您想使用，nodeValue则需要迭代子节点，而textContent将为您执行连接。
As discussed, there are also several DOM classes that do not support nodeValuebut do support textContent.
如前所述，还有几个 DOM 类不支持nodeValue但支持textContent.
nodeValueis faster for obvious reasons; however don't use it unless you know exactly what the node structure really is.
nodeValue由于显而易见的原因，速度更快；但是，除非您确切地知道节点结构是什么，否则不要使用它。
回答by Valerio Bozz
If you want to assigning a value to the textContentproperty note that it doesn't work for PHP < 5.6.1. Consider using nodeValueinstead, for backward compatibility.
如果您想为textContent属性赋值，请注意它不适用于PHP < 5.6.1。nodeValue为了向后兼容，请考虑使用。
回答by pguardiario
They're the same thing. (mikespook's NULL is from a non-DOMNode)
它们是同一回事。（mikespook 的 NULL 来自非 DOMNode）
