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    SimpleXMLElement::__construct

    (PHP 5, PHP 7)

    SimpleXMLElement::__construct — Crée un nouvel objet SimpleXMLElement

    Description

    final public SimpleXMLElement::__construct ( string $data [, int $options = 0 [, bool $data_is_url = FALSE [, string $ns = "" [, bool $is_prefix = FALSE ]]]] )

    Crée un nouvel objet SimpleXMLElement.

    Liste de paramètres

    data

    Une chaîne de caractères XML bien formée ou le chemin d'accès ou un URL pointant à un document XML si data_is_url vaut TRUE.

    options

    Optionnellement utilisé pour spécifier des paramètres Libxml additionnels.

    Note:

    Il peut être nécessaire de passer LIBXML_PARSEHUGE pour pouvoir traiter des nœuds de texte profondément imbriqués ou très volumineux.

    data_is_url

    Par défaut, data_is_url vaut FALSE. Utilisez TRUE pour spécifier que le paramètre data est un chemin d'accès ou un URL pointant à un document XML au lieu d'une chaîne de caractères de données.

    ns

    Préfixe d'espace de noms ou URI.

    is_prefix

    TRUE si ns est un préfix, FALSE sinon. Valeur par défaut : FALSE.

    Valeurs de retour

    Retourne un objet SimpleXMLElement représentant les données data.

    Erreurs / Exceptions

    Produit un message d'erreur de type E_WARNING pour chaque erreur trouvée dans les données XML et lance également une exception si les données XML ne peuvent re analysées.

    Astuce

    Utilisez la fonction libxml_use_internal_errors() pour supprimer toutes les erreurs XML et la fonction libxml_get_errors() pour les parcourir.

    Exemples

    Note:

    Les exemples listés incluent parfois example.php, ceci fait référence à la chaine XML du premier exemple de l'utilisation de base.

    Exemple #1 Crée un objet SimpleXMLElement

    <?php

    include 'example.php';

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

    ?>

    L'exemple ci-dessus va afficher :

    PHP: Behind the Parser

    Exemple #2 Crée un objet SimpleXMLElement à partir d'un URL

    <?php

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

    ?>

    Historique

    Version Description
    5.2.0 Ajout des paramètres ns et is_prefix.
    5.1.2 Ajout des paramètres options et data_is_url.

    Voir aussi

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    User Contributed Notes 7 notes

    up
    4
    rowan dot collins at gmail dot com
    1 year ago
    The manual doesn't really explain what the $ns argument (and the accompanying $is_prefix) are for.

    What they do is similar to the ->children() method: they set the context of the returned object to that namespace, so that access via ->elementName and ['attributeName'] refer to elements and attributes in that namespace.

    In particular, they do *not* change the namespaces which exist on the document.

    See this example:

    <?php
    // This XML contains two elements called <child>
    // One is in the namespace http://example.com, with local prefix 'ws'
    // The other has no namespace (no prefix, and no default namespace declared)
    $xml = '<ws:example xmlns:ws="http://example.com"><child>Not in namespace</child><ws:child>In example namespace</ws:child></ws:example>';

    $sx0 = new SimpleXMLElement($xml, 0, false);
    $sx1 = new SimpleXMLElement($xml, 0, false, 'http://example.com');
    $sx2 = new SimpleXMLElement($xml, 0, false, 'ws', true);

    echo     "
        Without:     {$sx0->child}
        By namespace:     {$sx1->child}
        By prefix:     {$sx2->child}
    "    ;
    ?>

    Output:

    Without: Not in namespace
    By namespace: In example namespace
    By prefix: In example namespace
    up
    6
    tudor at culise dot net
    10 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
    7 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
    2
    ahmad dot mayahi at gmail dot com
    2 years 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
    4 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
    -1
    Phil Cross
    4 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;
        }
    ?>
    up
    -1
    uramihsayibok, gmail, com
    9 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.
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