SimpleXMLElement::attributes

(PHP 5, PHP 7, PHP 8)

SimpleXMLElement::attributes — Identifica el atributo de un elemento

Descripción

public SimpleXMLElement::attributes(string $ns = null, bool $is_prefix = false): SimpleXMLElement

Esta función provee de los atributos y valores definidos dentro de una etiqueta XML.

Nota: SimpleXML ha desarrollado una regla para el añadido de propiedades iterativas a la mayoría de métodos. No pueden ser examinados usando var_dump() ni con cualquier otra función que examine objetos.

Parámetros

ns: Un namespace opcional para los atributos recuperados
is_prefix: Por defecto false

Valores devueltos

Devuelve un objeto SimpleXMLElement que puede ser iterado a través de los atributos en la etiqueta.

Devuelve null si se invoca sobre un objeto SimpleXMLElement que ya representa un atributo y no una etiqueta.

Historial de cambios

Versión	Descripción
5.2.0	Se añadió el parámetro opcional `is_prefix`.

Ejemplos

Ejemplo #1 Interpreta un string XML

<?php
$string = <<<XML
<a>
 <prueba nombre="uno" juego="solitario">1</prueba>
</a>
XML;

$xml = simplexml_load_string($string);
foreach($xml->prueba[0]->attributes() as $a => $b) {
    echo $a,'="',$b,"\"\n";
}
?>

El resultado del ejemplo sería:

nombre="uno"
juego="solitario"

Ver también

Uso básico de SimpleXML

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User Contributed Notes 6 notes

down

Xeoncross ¶

14 years ago

It is really simple to access attributes using array form. However, you must convert them to strings or ints if you plan on passing the values to functions.

<?php
SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [id] => 55555
        )

    [text] => "hello world"
)
?>

Then using a function

<?php
function xml_attribute($object, $attribute)
{
    if(isset($object[$attribute]))
        return (string) $object[$attribute];
}
?>

I can get the "id" like this

<?php
print xml_attribute($xml, 'id'); //prints "55555"
?>

down

chris at chlab dot ch ¶

12 years ago

Note that you must provide the namespace if you want to access an attribute of a non-default namespace:

Consider the following example:

<?php
$xml = <<<XML
<?xml version="1.0"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
 xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet">
 <Table Foo="Bar" ss:ExpandedColumnCount="7">
 </Table>
</Workbook>
XML;

$sxml = new SimpleXMLElement($xml);

/**
 * Access attribute of default namespace
 */
var_dump((string) $sxml->Table[0]['Foo']);
// outputs: 'Bar'

/**
 * Access attribute of non-default namespace
 */
var_dump((int) $sxml->Table[0]['ExpandedColumnCount']);
// outputs: 0

var_dump((int) $sxml->Table[0]->attributes('ss', TRUE)->ExpandedColumnCount);
// outputs: '7'
?>

down

sarlak ¶

13 years ago

<?php
$att = 'attribueName';

// You can access an element's attribute just like this :
$attribute = $element->attributes()->$att;

// This will save the value of the attribute, and not the objet
$attribute = (string)$element->attributes()->$att;

// You also can edit it this way :
$element->attributes()->$att = 'New value of the attribute';
?>

down

totalwipeout at gmail dot com ¶

12 years ago

Tip to get a real array of all attributes of a node (not SimpleXML's object acting like an array)

<?php
//- $node is a SimpleXMLElement object

$atts_object = $node->attributes(); //- get all attributes, this is not a real array
$atts_array = (array) $atts_object; //- typecast to an array

//- grab the value of '@attributes' key, which contains the array your after
$atts_array = $atts_array['@attributes'];

var_dump($atts_object); //- outputs object(SimpleXMLElement)[19]
                        //-             public '@attributes' => ...

var_dump($atts_array); //- outputs array (size=11) ...

?>
Hope this helps!

down

andy dot locologic+101 at gmail dot com ¶

9 years ago

Easiest and safest way to get attributes as an array is to use the iterator_to_array function (see http://php.net/manual/en/function.iterator-to-array.php):

<?php
      $x = new SimpleXMLElement('<div class="myclass" id="myid"/>');
      $attributes = iterator_to_array($x->attributes());
?>

down

webfelipemaia at gmail dot com ¶

11 years ago

Use attributes to display when it meets certain condition defined attribute / value in xml tags.

Use atributos para exibir quando atende determinada condição definida atributo / valor em tags XML.

Consider the following example:
Considere o seguinte exemplo:

(file.xml)

<?xml version="1.0" encoding="UTF-8"?>

<list>
    <item type="Language">
        <name>PHP</name>
        <link>www.php.net</link>
    </item>
    <item type="Database">
        <name>Java</name>
        <link>www.oracle.com/br/technologies/java/‎</link>
    </item>
</list>

Checks if the attribute value equals "Language", if equal prints everything that is related to "Language".

Verifica se o valor do atributo é igual a "Language", se for, imprime tudo o que for relativo ao mesmo.

<?php

$xml = simplexml_load_file("file.xml");

foreach($xml->children() as $child) {
    
        $role = $child->attributes();

        foreach($child as $key => $value) {
            
            if($role == "Language")
            echo("[".$key ."] ".$value . "<br />");
            
        }
}
?>

output:
saída:

[name] PHP
[link] www.php.net

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