SimpleXMLElement::asXML

(PHP 5, PHP 7, PHP 8)

SimpleXMLElement::asXML — Return a well-formed XML string based on SimpleXML element

Descrizione

public SimpleXMLElement::asXML(?string $filename = null): string|bool

The asXML method formats the parent object's data in XML version 1.0.

Elenco dei parametri

filename: If a string value is provided, the function writes the data to the file rather than returning it.

Valori restituiti

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.

Log delle modifiche

Versione	Descrizione
8.0.0	`filename` is nullable now.

Esempi

Example #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();

?>

Il precedente esempio visualizzerà:

<?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:

Example #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();
}
?>

Il precedente esempio visualizzerà:

<c>text</c><c>stuff</c>

Vedere anche:

SimpleXMLElement::__toString() - Returns the string content
Basic SimpleXML usage

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User Contributed Notes 2 notes

down

andreas dot theissen at t-online dot de ¶

12 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">&lt;Insert&gt;</key>
  <key lang="de">&lt;Einfügen&gt;</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.

down

oleg dot pavlin at gmail dot com ¶

12 years ago

Function asXML decodes special chars like ø, æ and others to &#xE6;, &#xF8;

To get normal output use without quoting:

$xml = html_entity_decode($xml, ENT_NOQUOTES, 'UTF-8');

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