SimpleXMLElement::__construct

(PHP 5 >= 5.0.1, PHP 7)

SimpleXMLElement::__constructErstellt ein neues SimpleXMLElement-Objekt

Beschreibung

__construct ( string $data [, int $options [, bool $data_is_url [, string $ns [, bool $is_prefix ]]]] )

Erstellt ein neues SimpleXMLElement-Objekt.

Parameter-Liste

data

Ein wohlgeformter XML-String, oder der Pfad oder URL zu einem XML-Dokument, wenn data_is_url TRUE ist.

options

Optional zu verwenden, um weitere Libxml Parameter anzugeben.

data_is_url

Standardmäßig ist data_is_url FALSE. Verwenden Sie TRUE, um data als Pfad oder URL zu einem XML-Dokument an Stelle eines Daten-Strings anzugeben.

ns

is_prefix

Rückgabewerte

Gibt ein SimpleXMLElement-Objekt zurück, das data repräsentiert.

Fehler/Exceptions

Erzeugt eine E_WARNING-Fehlermeldung für jeden gefundenen Fehler in den XML-Daten und wirft eine Exception, sobald ein solcher Fehler festgestellt wurde.

Tipp

libxml_use_internal_errors() kann verwendet werden, um alle XML-Fehler zu unterdrücken, und libxml_get_errors(), um danach über diese zu iterieren.

Beispiele

Beispiel #1 Erstellen eines SimpleXMLElement-Objekts

<?php

include 'example.php';

$sxe = new SimpleXMLElement($xmlstr);
echo 
$sxe->movie[0]->title;

?>

Beispiel #2 Erstellen eines SimpleXMLElement-Objekts von einem URL

<?php

$sxe 
= new SimpleXMLElement('http://example.org/document.xml'NULLTRUE);
echo 
$sxe->asXML();

?>

Siehe auch

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User Contributed Notes 6 notes

up
5
tudor at culise dot net
8 years ago
This class is extendable, but it's too bad that its constructor cannot be overriden (PHP says it's a final method). Thus the class should be wrapped using the delegation principle rather that extended.
up
2
kumarldh at gmail dot com
5 years ago
Using libxml_use_internal_errors() may suppress errors but Exception still requires decent handling. I used following code snippet.

<?php
libxml_use_internal_errors
(true);
try{
   
$xmlToObject = new SimpleXMLElement($notSoWellFormedXML);
} catch (
Exception $e){
    echo
'Please try again later...';
    exit();
}
?>
up
0
ahmad dot mayahi at gmail dot com
3 months ago
You won't be able to load an XML file without root element:

//This will throw an exception
$xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?>', null, false);

//Here is the solution
$xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><root></root>', null, false);
up
0
bertolini dot cedric at me dot com
2 years ago
It's worth noting that the behavior of SimpleXmlElement::__construct is not exactly the same as simplexml_load_string, regarding libxml_use_internal_errors().

In my case,

<?php
libxml_use_internal_errors
(true);
new \
SimpleXmlElement($data);
?>

was still throwing error. But as soon as I switched to

<?php
libxml_use_internal_errors
(true);
simplexml_load_string($data);
?>

everything worked fine and I stopped getting an error.
up
0
uramihsayibok, gmail, com
7 years ago
As I was filling out a bug report, I realized why (speculation here) the constructor is final: so that functions like simplexml_load_file and simplexml_load_string can work. I imagine the PHP-ized code looks something like

<?php

function simplexml_load_file($filename, $class_name = "SimpleXMLElement", $options = 0, $ns = "", $is_prefix = false) {
    return new
$class_name($filename, $options, true, $ns, $is_prefix);
}

?>

If we were to use a different $class_name and change the constructor's definition these functions wouldn't work.

There's no easy, sensible solution that keeps simplexml_load_file and simplexml_load_string.
up
-1
Phil Cross
2 years ago
It's worth noting, that you need to typecast dynamic property names to string in order to retrieve there value, for example:

<?php
    $xml
= new SimpleXMLElement('records.xml', 0, true);

   
// This will work as expected because its a hard coded property value
   
foreach($xml as $record){
        echo
$record->id;    // Will output the ID fine
   
}

   
// Dynamic properties require typecasting to string
   
$xml_field = 'id';
    foreach(
$xml as $record){

       
// This will dump a SimpleXMLElement object
       
var_dump($record->$xml_field);

       
// This will output the value as expected
       
echo (string)$record->$xml_field;
    }
?>
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