여기 있는 많은 예제는 XML 문자열이 필요합니다. 모든 예제에서 문자열을 반복하는 대신에, 각 예제에서 포함하는 파일을 넣어두겠습니다. 이 파일은 다음 예제 섹션에 있습니다. 이 방법 대신, XML 문서를 만들고 simplexml_load_file()으로 읽어올 수도 있습니다.

Example #1 XML 문자열을 가진 포함 파일 example.php

<?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;
?>

SimpleXML의 간단함은 기본 XML 문서에서 하나의 문자열이나 숫자를 가져오는 데에서 보여집니다.

Example #2 <plot> 가져오기.

<?php
include 'example.php';

$xml = new SimpleXMLElement($xmlstr);

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

XML 문서 안에 PHP 이름 규칙에 어긋나는 요소(예: 하이픈)에 접근할 때는 요소 이름을 {}과 '로 감쌉니다.

Example #3 <line> 가져오기.

<?php
include 'example.php';

$xml = new SimpleXMLElement($xmlstr);

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

Example #4 SimpleXML에서 다중 요소에 접근하기.

하나의 부모 요소에 포함되는 여러 개의 자식 요소에 접근할 때는, 일반적인 반복 기술이 적용됩니다.

<?php
include 'example.php';

$xml = new SimpleXMLElement($xmlstr);

/* 각 <movie> 노드에서, 각각의 <plot>을 출력합니다. */
foreach ($xml->movie as $movie) {
   echo 
$movie->plot'<br />';
}

?>

Example #5 속성 사용하기

여기까지, 요소 이름과 값만을 다뤘습니다. SimpleXML은 요소의 속성에도 접근할 수 있습니다. 요소 속성에 접근할때는 요소를 단순히 array로 취급하면 됩니다.

<?php
include 'example.php';

$xml = new SimpleXMLElement($xmlstr);

/* 첫번째 movie의 <rating> 노드에 접근합니다.
 * Output the rating scale, too. */
foreach ($xml->movie[0]->rating as $rating) {
    switch((string) 
$rating['type']) { // Get attributes as element indices
    
case 'thumbs':
        echo 
$rating' thumbs up';
        break;
    case 
'stars':
        echo 
$rating' stars';
        break;
    }
}
?>

Example #6 요소와 속성을 텍스트와 비교하기.

요소와 속성을 문자열과 비교하거나, 문자열을 요구하는 함수에 통과시킬 때는 (string)을 사용하여 문자열로 변환해야 합니다. 그렇지 않으면, PHP는 요소를 객체로 취급합니다.

<?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);
?>

Example #7 두 요소 비교하기.

PHP 5.2.0부터 두 개의 SimpleXMLElement는 같은 곳을 가르키고 있어도 다른 것으로 간주합니다.

<?php
$el1 
= new SimpleXMLElement($xmlstr);
$el2 = new SimpleXMLElement($xmlstr);
var_dump($el1 == $el2); // PHP 5.2.0 부터 false
?>

Example #8 XPath 사용하기.

SimpleXML은 XPath 지원을 내장하고 있습니다. 모든 <character> 요소를 찾으려면:

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

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

'//'은 와일드카드로 사용됩니다. 절대 경로로 지정하려면, 슬래시 하나를 생략하십시오.

Example #9 값 설정하기.

SimpleXML의 데이터는 바뀔 수 있습니다. SimpleXML은 모든 객체에 대한 변경을 허용합니다.

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

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

echo 
$xml->asXML();
?>

위 코드는 원본에서 Ms. Coder를 Miss Coder로 변경한 새 XML 문서를 출력합니다.

Example #10 요소와 속성 추가하기.

PHP 5.1.3부터, SimpleXML은 자식과 속성을 쉽게 추가할 수 있게 되었습니다.

<?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();
?>

위 코드는 원본 XML에서 새로운 character와 rating을 추가한 XML 문서를 출력합니다.

Example #11 DOM 상호 작용.

PHP는 XML 노드를 SimpleXML과 DOM 형식으로 변환할 수 있습니다. 이 예제는 DOM 요소를 SimpleXML로 바꾸는 방법을 보여줍니다.

<?php
$dom 
= new domDocument;
$dom->loadXML('<books><book><title>blah</title></book></books>');
if (!
$dom) {
     echo 
'Error while parsing the document';
     exit;
}

$s simplexml_import_dom($dom);

echo 
$s->book[0]->title;
?>

위 예제의 출력:

blah

add a note add a note

User Contributed Notes 14 notes

up
67
rowan dot collins at gmail dot com
8 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
70
jishcem at gmail dot com
11 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
7
Anonymous
6 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
15
ie dot raymond at gmail dot com
14 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
$xml->asXML();
?>
up
8
kdos
13 years ago
Using stuff like: is_object($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
7
gkokmdam at zonnet dot nl
13 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
2
Max K.
13 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
0
php at keith tyler dot com
14 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
-3
RiKdnUA at mail dot ru
10 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
-6
radams at circlepix com
15 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
-6
dianarusu21 at gmail dot com
6 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..
up
-9
bjorn at xQmail dot eu
14 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
9 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
-10
eng dot emad_2010 at yahoo dot com
10 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;
?>
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