Temel kullanım

Bu eklentideki bir çok örnek bir XML dizge gerektirir. Her örnekte bu dizgeyi tekrar tekrar yazmak yerine her örnekte içerilmek üzere bir dosyaya koyduk. Bu dosyanın içeriği aşağıda verilmiştir. İsterseniz kendi XML belgenizi oluşturup simplexml_load_file() işleviyle de okutabilirsiniz.

Örnek 1 - XML dizge olarak içerilecek example.php dosyası

<?php
$xmlstr 
= <<<XML
<?xml version='1.0' standalone='yes'?>
<movies>
 <movie>
  <title>PHP: Behind the Parser</title>
  <characters>
   <character>
    <name>Ms. Coder</name>
    <actor>Onlivia Actora</actor>
   </character>
   <character>
    <name>Mr. Coder</name>
    <actor>El Act&#211;r</actor>
   </character>
  </characters>
  <plot>
   So, this language. It's like, a programming language. Or is it a
   scripting language? All is revealed in this thrilling horror spoof
   of a documentary.
  </plot>
  <great-lines>
   <line>PHP solves all my web problems</line>
  </great-lines>
  <rating type="thumbs">7</rating>
  <rating type="stars">5</rating>
 </movie>
</movies>
XML;
?>

Basit XML eklentisinin basitleştiriciliği, en açık haliyle basit bir XML belgeden bir sayı veya dizgeyi çıkarırken görülür.

Örnek 2 - <plot> içeriğinin eldesi

<?php
include 'example.php';

$xml = new SimpleXMLElement($xmlstr);

echo 
$xml->movie[0]->plot// "So this language. It's like..."
?>

Bir XML belgedeki elemanlara erişirken, PHP isimlendirme kurallarına uymayan (örneğin, tire içeren) eleman isimleri tek tırnak ve kaşlı ayraçlarla sarmalanarak belirtilebilir.

Örnek 3 - <line> içeriğinin eldesi

<?php
include 'example.php';

$xml = new SimpleXMLElement($xmlstr);

echo 
$xml->movie->{'great-lines'}->line// "PHP solves all my web problems"
?>

Örnek 4 - Bir elemanın birden fazla örneğine erişim

Bir ebeveyn elemanın aynı isimdeki birden fazla çocuğunun içeriğini elde etmek için normal yineleme teknikleri kullanılır.

<?php
include 'example.php';

$xml = new SimpleXMLElement($xmlstr);

/* Her <movie> düğümündeki <plot> içeriğini çıkaralım */
foreach ($xml->movie as $movie) {
   echo 
$movie->plot'<br />';
}

?>

Örnek 5 - Özniteliklerin kullanımı

Şimdiye kadar hep eleman isimleri ve içerikleri ile çalıştık. Basit XML eklentisi eleman özniteliklerine de erişir. Eleman özniteliklerine, eleman ismini taşıyan dizinin anahtarları olarak erişebilirsiniz.

<?php
include 'example.php';

$xml = new SimpleXMLElement($xmlstr);

/* İlk <movie> içindeki <rating> düğümlerine erişelim.
 * İstatistiksel sonuçları çıktılayalım. */
foreach ($xml->movie[0]->rating as $rating) {
    switch((string) 
$rating['type']) { // Öznitelikler birer anahtardır
    
case 'thumbs':
        echo 
$rating' onaylı';
        break;
    case 
'stars':
        echo 
$rating' yıldızlı';
        break;
    }
}
?>

Örnek 6 - Elemanları ve öznitelikleri karşılaştırmak

Bir elemanı veya özniteliği bir dizge ile karşılaştırmak veya bir dizge gerektiren bir işleve aktarmak için nesnenin önüne (string) getirerek tür dönüşümü yapmalısınız. Aksi takdirde PHP, elemanı bir nesne olarak ele alır.

<?php
include 'example.php';

$xml = new SimpleXMLElement($xmlstr);

if ((string) 
$xml->movie->title == 'PHP: Behind the Parser') {
    print 
'My favorite movie.';
}

htmlentities((string) $xml->movie->title);
?>

Örnek 7 - İki elemanı karşılaştırmak

İki SimpleXMLElement nesnesi, aynı elemana ait olsalar bile, PHP 5.2.0'dan beri farklı nesneler olarak ele alınırlar.

<?php
$el1 
= new SimpleXMLElement($xmlstr);
$el2 = new SimpleXMLElement($xmlstr);
var_dump($el1 == $el2); // PHP 5.2.0'dan sonra FALSE
?>

Örnek 8 - XPath kullanımı

Basit XML eklentisinin yerleşik XPath desteği vardar. Tüm <character> elemanlarını bulmak isteyelim:

<?php
include 'example.php';
$xml = new SimpleXMLElement($xmlstr);

foreach (
$xml->xpath('//character') as $character) {
    echo 
$character->name'played by '$character->actor'<br />';
}
?>

'//character' ifadesindeki '//' bir kısaltma olup, belgedeki tüm character elemanları anlamına gelir (Bakınız: » XML Adresleme Dili (XPath) 1.0 belirtimi).

Örnek 9 - Değer atamak

SimpleXMLElement nesnesinin verileri birer sabit değildir. Nesnenin tüm elemanlarında değişiklik yapılabilir.

<?php
include 'example.php';
$xml = new SimpleXMLElement($xmlstr);

$xml->movie[0]->characters->character[0]->name 'Miss Coder';

echo 
$xml->asXML();
?>

Yukarıdaki kod, özgün belgedeki 'Ms. Coder' dizgesinin yerine 'Miss Coder' dizgesini yerleştirerek yeni bir XML belge çıktılar.

Örnek 10 - Eleman ve öznitelik eklemek

PHP 5.1.3'ten beri, SimpleXMLElement nesnesine çocuk elemanlar ve öznitelikler eklenebilmektedir.

<?php
include 'example.php';
$xml = new SimpleXMLElement($xmlstr);

$character $xml->movie[0]->characters->addChild('character');
$character->addChild('name''Mr. Parser');
$character->addChild('actor''John Doe');

$rating $xml->movie[0]->addChild('rating''PG');
$rating->addAttribute('type''mpaa');

echo 
$xml->asXML();
?>

Yukarıdaki kod, özgün belgeye yeni elemanlar ve öznitelikler ekleyerek yeni bir XML belge çıktılar.

Örnek 11 - DOM ile çalışabilirlik

PHP, XML düğümlerin Basit XML ve DOM biçemleri arasında dönüşüm yapılabilmeyi sağlayan bir mekanizmaya sahiptir. Bu örnekte bir DOM elemanının bir SimpleXMLElement nesnesine dönüştürülmesi gösterilmiştir.

<?php
$dom 
= new domDocument;
$dom->loadXML('<books><book><title>blah</title></book></books>');
if (!
$dom) {
     echo 
'Belge çözümlenirken hata oluştu';
     exit;
}

$s simplexml_import_dom($dom);

echo 
$s->book[0]->title;
?>

add a note add a note

User Contributed Notes 14 notes

up
53
rowan dot collins at gmail dot com
4 years ago
There is a common "trick" often proposed to convert a SimpleXML object to an array, by running it through json_encode() and then json_decode(). I'd like to explain why this is a bad idea.

Most simply, because the whole point of SimpleXML is to be easier to use and more powerful than a plain array. For instance, you can write <?php $foo->bar->baz['bing'] ?> and it means the same thing as <?php $foo->bar[0]->baz[0]['bing'] ?>, regardless of how many bar or baz elements there are in the XML; and if you write <?php (string)$foo->bar[0]->baz[0] ?> you get all the string content of that node - including CDATA sections - regardless of whether it also has child elements or attributes. You also have access to namespace information, the ability to make simple edits to the XML, and even the ability to "import" into a DOM object, for much more powerful manipulation. All of this is lost by turning the object into an array rather than reading understanding the examples on this page.

Additionally, because it is not designed for this purpose, the conversion to JSON and back will actually lose information in some situations. For instance, any elements or attributes in a namespace will simply be discarded, and any text content will be discarded if an element also has children or attributes. Sometimes, this won't matter, but if you get in the habit of converting everything to arrays, it's going to sting you eventually.

Of course, you could write a smarter conversion, which didn't have these limitations, but at that point, you are getting no value out of SimpleXML at all, and should just use the lower level XML Parser functions, or the XMLReader class, to create your structure. You still won't have the extra convenience functionality of SimpleXML, but that's your loss.
up
80
jishcem at gmail dot com
6 years ago
For me it was easier to use arrays than objects,

So, I used this code,

$xml = simplexml_load_file('xml_file.xml');
   
$json_string = json_encode($xml);
   
$result_array = json_decode($json_string, TRUE);

Hope it would help someone
up
5
Anonymous
2 years ago
If your xml string contains booleans encoded with "0" and "1", you will run into problems when you cast the element directly to bool:

$xmlstr = <<<XML
<?xml version='1.0' standalone='yes'?>
<values>
    <truevalue>1</truevalue>
    <falsevalue>0</falsevalue>
</values>
XML;
$values = new SimpleXMLElement($xmlstr);
$truevalue = (bool)$values->truevalue; // true
$falsevalue = (bool)$values->falsevalue; // also true!!!

Instead you need to cast to string or int first:

$truevalue = (bool)(int)$values->truevalue; // true
$falsevalue = (bool)(int)$values->falsevalue; // false
up
17
ie dot raymond at gmail dot com
9 years ago
If you need to output valid xml in your response, don't forget to set your header content type to xml in addition to echoing out the result of asXML():

<?php

$xml
=simplexml_load_file('...');
...
...
xml stuff
...

//output xml in your response:
header('Content-Type: text/xml');
echo
$xml->asXML();
?>
up
4
Max K.
9 years ago
From the README file:

SimpleXML is meant to be an easy way to access XML data.

SimpleXML objects follow four basic rules:

1) properties denote element iterators
2) numeric indices denote elements
3) non numeric indices denote attributes
4) string conversion allows to access TEXT data

When iterating properties then the extension always iterates over
all nodes with that element name. Thus method children() must be
called to iterate over subnodes. But also doing the following:
foreach ($obj->node_name as $elem) {
  // do something with $elem
}
always results in iteration of 'node_name' elements. So no further
check is needed to distinguish the number of nodes of that type.

When an elements TEXT data is being accessed through a property
then the result does not include the TEXT data of subelements.

Known issues
============

Due to engine problems it is currently not possible to access
a subelement by index 0: $object->property[0].
up
5
kdos
8 years ago
Using stuff like: is_object($xml->module->admin) to check if there actually is a node called "admin", doesn't seem to work as expected, since simplexml always returns an object- in that case an empty one  - even if a particular node does not exist.
For me good old empty() function seems to work just fine in such cases.

Cheers
up
5
gkokmdam at zonnet dot nl
8 years ago
A quick tip on xpath queries and default namespaces. It looks like the XML-system behind SimpleXML has the same workings as I believe the XML-system .NET uses: when one needs to address something in the default namespace, one will have to declare the namespace using registerXPathNamespace and then use its prefix to address the otherwise in the default namespace living element.

<?php
$string
= <<<XML
<?xml version='1.0'?>
<document xmlns="http://www.w3.org/2005/Atom">
<title>Forty What?</title>
<from>Joe</from>
<to>Jane</to>
<body>
  I know that's the answer -- but what's the question?
</body>
</document>
XML;

$xml = simplexml_load_string($string);
$xml->registerXPathNamespace("def", "http://www.w3.org/2005/Atom");

$nodes = $xml->xpath("//def:document/def:title");

?>
up
1
php at keith tyler dot com
9 years ago
[Editor's Note: The SimpleXMLIterator class, however, does implement these methods.]

While SimpleXMLElement claims to be iterable, it does not seem to implement the standard Iterator interface functions like ::next and ::reset properly. Therefore while foreach() works, functions like next(), current(), or each() don't seem to work as you would expect -- the pointer never seems to move or keeps getting reset.
up
-6
RiKdnUA at mail dot ru
6 years ago
Если кодировка XML-документа отличается от UTF-8, объявление кодировки должно следовать сразу после version='...' и перед standalone='...'. Это требование стандарта XML.

If encoding XML-document differs from UTF-8. Encoding declaration should follow immediately after the version = '...' and before standalone = '...'. This requirement is standard XML.

<?xml version='1.0' encoding='windows-1251' standalone='yes'?>
Ok
<?xml version='1.0' standalone='yes' encoding='windows-1251'?>
<body>Русский язык. Russian language</body>
Fatal error: Uncaught exception 'Exception' with message 'String could not be parsed as XML' in...
up
-5
radams at circlepix com
10 years ago
To test whether an element exists:

<?php

    $xml
= <<<EOT
<?xml version='1.0' standalone='yes'?>
<root>
    <test1></test1>
    <test2 />
    <test4> </test4>
</root>
EOT;

   
$xmlDoc = new SimpleXMLElement($xml);

echo
"Test1: \n";
var_dump($xmlDoc->test1);
echo
"\n(" . (bool)$xmlDoc->test1 . ")";
echo
"\n\n";

echo
"Test2: \n";
var_dump($xmlDoc->test2);
echo
"\n(" . (bool)$xmlDoc->test2 . ")";
echo
"\n\n";

echo
"Test3: \n";
var_dump($xmlDoc->test3);
echo
"\n(" . (bool)$xmlDoc->test3 . ")";
echo
"\n\n";

echo
"Test4: \n";
var_dump($xmlDoc->test4);
echo
"\n(" . (bool)$xmlDoc->test4 . ")";
echo
"\n\n";

?>

The var_dumps for test1, test2, and test3 are identical, but the (bool) test gives a '1' for test1 and test2, and a '' for test3.
up
-8
bjorn at xQmail dot eu
10 years ago
If you're not sure the XML will be valid you'd better use:

<?php
$xmlObject
= simplexml_load_string($xml);
// or
$xmlObject = simplexml_load_file(xml);
?>

Both of these return a SimpleXMLElement Object or a libXMLError Object.
up
-14
mymymymy at mymymymy dot com
4 years ago
$children = $xml->children();
var_dump($children[0]["@attributes"]);//"NULL"
var_dump($children[0]);//(2) ["@attributes"]=>array(1) {['x']=> string(1) '2'}

no faithfully (not true)
------
example:

SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [name] => USA
        )
)

print_r($xml->country->attributes()->name);
show:
SimpleXMLElement Object
(
    [0] => USA
)

print_r((string)$xml->country->attributes()->name);
show:
USA
up
-11
eng dot emad_2010 at yahoo dot com
6 years ago
Example #  DOM Interoperability التشغيل البيني   
PHP has a mechanism to convert XML nodes between SimpleXML and DOM formats. This example shows how one might change a DOM element to SimpleXML  .
The simplexml_import_dom() function returns a SimpleXMLElement object from a DOM node.
DOM         object

<?php
//create DOM  document $dom that contain XML
$dom = new DOMDocument;
$dom->loadXML('<books><book><title>blah</title></book></books>');
if (!
$dom) {
    echo
'Error while parsing the document';
    exit;
}
//convert DOM document $dom to object $books
$books = simplexml_import_dom($dom);

//access object $books
echo $books->book[0]->title;
?>
up
-7
dianarusu21 at gmail dot com
2 years ago
Quick start with xml.

//PHP file:
<?php
$xml
= simplexml_load_file("simpleXml.xml");

foreach (
$xml as $key => $value) {
  foreach (
$value as $key => $value) {
    echo
$key.": ".$value."</br>";
  }
}
?>

//XML file:
<?xml version="1.0" encoding="UTF-8"?>
<locations>
  <country>
    <name>Romania</name>
    <capital>Bucharest</capital>
    <language>Romanian</language>
  </country>
  <country>
    <name>Frace</name>
    <capital>Paris</capital>
    <language>France</language>
  </country>
  <country>
    <name>Spain</name>
    <capital>Madrid</capital>
    <language>Spanish</language>
  </country>
</locations>

//Output:
// name: Romania
// capital: Bucharest
// language: Romanian
// name: Frace
// capital: Paris
// language: France
// name: Spain
// capital: Madrid
// language: Spanish

NOTE: You don't need to include the xml file in the php file..
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