将 SimpleXml 转换为字符串

You can use the SimpleXMLElement::asXML() method to accomplish this:

$string = "<element><child>Hello World</child></element>";
$xml = new SimpleXMLElement($string);


// The entire XML tree as a string:
// "<element><child>Hello World</child></element>"
$xml->asXML();


// Just the child node as a string:
// "<child>Hello World</child>"
$xml->child->asXML();

You can use the asXML method as:

<?php


// string to SimpleXMLElement
$xml = new SimpleXMLElement($string);


// make any changes.
....


// convert the SimpleXMLElement back to string.
$newString = $xml->asXML();
?>

Actually asXML() converts the string into xml as it name says:

<id>5</id>

This will display normally on a web page but it will cause problems when you matching values with something else.

You may use strip_tags function to get real value of the field like:

$newString = strip_tags($xml->asXML());

PS: if you are working with integers or floating numbers, you need to convert it into integer with intval() or floatval().

$newNumber = intval(strip_tags($xml->asXML()));

You can use casting:

<?php


$string = "<element><child>Hello World</child></element>";
$xml = new SimpleXMLElement($string);


$text = (string)$xml->child;

$text will be 'Hello World'

You can use ->child to get a child element named child.

This element will contain the text of the child element.

But if you try var_dump() on that variable, you will see it is not actually a PHP string.

The easiest way around this is to perform a strval(xml->child); That will convert it to an actual PHP string.

This is useful when debugging when looping your XML and using var_dump() to check the result.

So $s = strval($xml->child);.

Here is a function I wrote to solve this issue (assuming tag has no attributes). This function will keep HTML formatting in the node:

function getAsXMLContent($xmlElement)
{
$content=$xmlElement->asXML();


$end=strpos($content,'>');
if ($end!==false)
{
$tag=substr($content, 1, $end-1);


return str_replace(array('<'.$tag.'>', '</'.$tag.'>'), '', $content);
}
else
return '';
}




$string = "<element><child>Hello World</child></element>";
$xml = new SimpleXMLElement($string);


echo getAsXMLContent($xml->child); // prints Hello World

Probably depending on the XML feed you may/may not need to use __toString(); I had to use the __toString() otherwise it is returning the string inside an SimpleXMLElement. Maybe I need to drill down the object further ...

Sometimes you can simply typecast:

// this is the value of my $xml
object(SimpleXMLElement)#10227 (1) {
[0]=>
string(2) "en"
}


$s = (string) $xml; // returns "en";