php 让 SimpleXMLElement 在输出中包含编码
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Getting SimpleXMLElement to include the encoding in output
提问by dirtside
This:
这个：
$XML = new SimpleXMLElement("<foo />");
echo($XML->asXML());
...outputs this:
...输出这个：
<?xml version="1.0"?>
<foo/>
But I want it to output the encoding, too:
但我也希望它输出编码：
<?xml version="1.0" encoding="UTF-8"?>
<foo/>
Is there some way to tell SimpleXMLElement to include the encoding attribute of the <?xml?> tag? Aside from doing this:
有没有办法告诉 SimpleXMLElement 包含 <?xml?> 标签的编码属性？除了这样做：
$XML = new SimpleXMLElement("<?xml version='1.0' encoding='utf-8'?><foo />");
echo($XML->asXML());
Which works, but it's annoying to have to manually specify the version and encoding.
哪个有效，但必须手动指定版本和编码很烦人。
Assume for the purposes of this question that I cannot use DOMDocument instead.
出于这个问题的目的，假设我不能使用 DOMDocument 代替。
回答by Cristian Toma
You can try this, but you must use simplexml_load_stringfor $xml
你可以试试这个，但你必须对 $xml使用simplexml_load_string
$xml // Your main SimpleXMLElement
$xml->addAttribute('encoding', 'UTF-8');
Or you can still use other means to add the encoding to your output.
或者您仍然可以使用其他方式将编码添加到您的输出中。
Simple Replacement
简单更换
$outputXML=str_replace('<?xml version="1.0"?>', '<?xml version="1.0" encoding="UTF-8"?>', $outputXML);
Regular Expressions
常用表达
$outputXML=preg_replace('/<\?\s*xml([^\s]*)\?>/' '<?xml encoding="UTF-8"?>', $outputXML);
DOMDocument- I know you said you don't want to use DOMDocument, but here is an example
DOMDocument-我知道你说过你不想使用 DOMDocument，但这里有一个例子
$xml=dom_import_simplexml($simpleXML);
$xml->xmlEndoding='UTF-8';
$outputXML=$xml->saveXML();
You can wrap this code into a function that receives a parameter $encoding and adds it to the
您可以将此代码包装到一个函数中，该函数接收一个参数 $encoding 并将其添加到
回答by DarckBlezzer
Simple and clear only do this
简单明了只做这个
$XMLRoot = new SimpleXMLElement('<?xml version="1.0" encoding="utf-8"?><element></element>');
OutPut
输出
<?xml version="1.0" encoding="UTF-8"?>
<element></element>
to add attributes in element only use
在元素中添加属性只使用
$XMLRoot->addAttribute('name','juan');
to add child use
添加儿童使用
$childElement = $XMLRoot->addChild('elementChild');
$childElement->addAttribute('attribName','somthing');
回答by LevinM
The DOMDoc proposal of Cristian Tomaseems a good approach if the document isn't too heavy. You could wrap it up in something like this:
如果文档不太重，Cristian Toma的 DOMDoc 提案似乎是一个不错的方法。你可以把它包装成这样：
private function changeEncoding(string $xml, string $encoding) {
$dom = new \DOMDocument();
$dom->loadXML($xml);
$dom->encoding = $encoding;
return $dom->saveXML();
}
Comes in useful when you don't have access to the serializer producing the xml.
当您无权访问生成 xml 的序列化程序时很有用。
回答by Toby Allen
I would say you will need to do this on creation of each XML object. Even if SimpleXMLElement had a way of setting it you would still need to set it as I guess it would be possible for the object to pick a valid default.
我会说您需要在创建每个 XML 对象时执行此操作。即使 SimpleXMLElement 有设置它的方法，您仍然需要设置它，因为我猜对象有可能选择一个有效的默认值。
Maybe create a constant and Create objects like this
也许创建一个常量并像这样创建对象
$XML = new SimpleXMLElement($XMLNamespace . "<foo />");
echo($XML->asXML());
回答by TML
If you don't specify an encoding, SimpleXML cannot (sanely) guess which one you intended.
如果您不指定编码，SimpleXML 无法（理智地）猜测您想要的编码。
