- PHP 手册
- 函数参考
- XML 操作
- SimpleXML
- SimpleXMLElement
SimpleXMLElement::asXML
(PHP 5, PHP 7, PHP 8)
SimpleXMLElement::asXML — Return a well-formed XML string based on SimpleXML element
说明
public SimpleXMLElement::asXML(?string$filename = null): string|bool
The asXML method formats the parent object's data
in XML version 1.0.
参数
-
filename -
If a string value is provided, the function writes the data to the file rather than returning it.
返回值
If the filename isn't specified, this function
returns a string on success and false on error. If the
parameter is specified, it returns true if the file was written
successfully and false otherwise.
更新日志
| 版本 | 说明 |
|---|---|
| 8.0.0 |
filename is nullable now.
|
范例
示例 #1 Get XML
<?php
$string = <<<XML
<a>
<b>
<c>text</c>
<c>stuff</c>
</b>
<d>
<c>code</c>
</d>
</a>
XML;
$xml = new SimpleXMLElement($string);
echo $xml->asXML();
?>
以上例程会输出：
<?xml version="1.0"?> <a> <b> <c>text</c> <c>stuff</c> </b> <d> <c>code</c> </d> </a>
asXML also works on Xpath results:
示例 #2 Using asXML() on SimpleXMLElement::xpath() results
<?php
// Continued from example XML above.
/* Search for <a><b><c> */
$result = $xml->xpath('/a/b/c');
foreach ($result as $node) {
echo $node->asXML();
}
?>
以上例程会输出：
<c>text</c><c>stuff</c>
参见
- SimpleXMLElement::__toString() - Returns the string content
- Basic SimpleXML usage
User Contributed Notes 3 notes
up down 31 andreas dot theissen at t-online dot de ¶9 years ago
To prevent asXML from encoding vowels unwantedly, simply use an approriate XML header with encoding in advance.
If you do so, asXML will happily leave your vowels (and the header) entirely untouched.
<?php
$xmlstr =
'<?xml version="1.0" encoding="UTF-8"?>
<keys>
<key lang="en"><Insert></key>
<key lang="de"><Einfügen></key>
</keys>';
$sxe = new SimpleXMLElement($xmlstr);
$output = $sxe->asXML();
?>
$xmlstr and $output are identical now.
The subsequent use of html_entity_decode() (as proposed in the very beginning in another post) has several drawbacks:
1. It is slow
2. It is expensive
3. If there are already encoded arrow brackets or double quotes in your source for instance (as shown in the above example), markup will be broken.
up
down
9
oleg dot pavlin at gmail dot com ¶10 years ago
Function asXML decodes special chars like ø, æ and others to æ, ø
To get normal output use without quoting:
$xml = html_entity_decode($xml, ENT_NOQUOTES, 'UTF-8');
up
down
-60
jcr at di dot uminho dot pt ¶11 years ago
Code snippet to load a XML document, increment an attribute and store it again.
My XML looks like:
<?xml version="1.0" encoding="ISO-8859-1"?>
<doctypes counter="16">
<doctype id="d1">
<name>Carta</name>
<acro>CA</acro>
</doctype>
...
</doctypes>
I want to retrieve the counter attribute, increment it, and store the new document at the end:
<?php
$document = simplexml_load_file("mydoc.xml");
$cont = (integer) $document['counter'];
$document['counter'] = $cont+1;
$document->asXML("mydoc.xml");
?>
add a note
官方地址：https://www.php.net/manual/en/simplexmlelement.asxml.php