php 如何将 DOMNodeList 对象转换为数组
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How to convert DOMNodeList object into array
提问by Oto Shavadze
I have this code:
我有这个代码：
$dom = new DOMDocument();
$dom->load('file.xml');
$names = $dom->getElementsByTagName('name');
Now, $namesis DOMNodeList object, I need to convert this object into an array,
现在，$names是 DOMNodeList 对象，我需要把这个对象转换成一个数组，
$names = (array)$names;
var_dump($names); // empty array
The above code does not work and returns an empty array, why?
上面的代码不起作用并返回一个空数组，为什么？
采纳答案by álvaro González
Why doesn't (array)work? Because a DOMNodeListobject has only one property, length, and it's of integer type:
为什么（数组）不起作用？因为DOMNodeList对象只有一个属性length，并且它是整数类型：
If an object is converted to an array, the result is an array whose elements are the object's properties. The keys are the member variable names, with a few notable exceptions: integer properties are unaccessible; private variables have the class name prepended to the variable name; protected variables have a '*' prepended to the variable name. These prepended values have null bytes on either side.
如果将对象转换为数组，则结果是一个数组，其元素是对象的属性。键是成员变量名，有几个值得注意的例外：整数属性是不可访问的；私有变量在变量名前加上了类名；受保护的变量在变量名前有一个“*”。这些前置值在任一侧都有空字节。
Since a DOMNodeListimplements the Traversableinterface, it's fairly easy to create the array yourself:
由于DOMNodeList实现了Traversable接口，因此自己创建数组相当容易：
$array = array();
foreach($names as $node){
$array[] = $node;
}
Edit:I've removed the initial explanation because it doesn't apply here. What the manual means is that properties with numeric names are passed to the array but cannot be read:
编辑：我已经删除了最初的解释，因为它在这里不适用。手册的意思是具有数字名称的属性被传递给数组但无法读取：
<?php
class Foo{
public function __construct(){
$this->{123} = 456;
}
}
$array = (array)new Foo;
var_dump($array);
var_dump($array['123']);
array(1) {
["123"]=>
int(456)
}
Notice: Undefined offset: 123 in D:\tmp\borrame.php on line 11
NULL
The explanation is probably more on the line that DOMNodeListis not a user object created with PHP code but a builtin object defined in C, so different rules apply.
解释可能更多的是，DOMNodeList它不是用 PHP 代码创建的用户对象，而是用 C 定义的内置对象，因此适用不同的规则。
回答by Blar
Use iterator_to_array() to convert a DomNodeList to an Array
使用 iterator_to_array() 将 DomNodeList 转换为数组
$document = new DomDocument();
$document->load('test.xrds');
$nodeList = $document->getElementsByTagName('Type');
$array = iterator_to_array($nodeList);
回答by complex857
Just iterate trough the elements and put them into an array:
只需遍历元素并将它们放入数组中：
$names_array = array();
foreach ($names as $name) {
$names_array[] = $name; // this is a DOMNode instance
// you might want to have the textContent of them like this
$names_array[] = $name->textContent;
}
This way they still will be DOMNode instances, you might want to get their textContentproperty.
这样它们仍然是 DOMNode 实例，您可能想要获取它们的textContent属性。
回答by Puzzled Boy
$dom = new DOMDocument();
$dom->load('file.xml');
$names = $dom->getElementsByTagName('name');
$headlines = array();
foreach($names as $name) {
$headline = array();
if($name->childNodes->length) {
foreach($name->childNodes as $i) {
$headline[$i->nodeName] = $i->nodeValue;
}
}
$headlines[] = $headline;
}
回答by Will
Assuming you want the actual values and not to create an array of DOM nodes:
假设您想要实际值而不是创建 DOM 节点数组：
foreach($nodelist as $node) {
$values[] = $node->nodeValue;
}
