simplexml_load_string
(PHP 5, PHP 7, PHP 8)
simplexml_load_string — XML 文字列をオブジェクトに代入する
説明
simplexml_load_string(
string
?string
int
string
bool
): SimpleXMLElement|false
string
$data,?string
$class_name = SimpleXMLElement::class,int
$options = 0,string
$namespace_or_prefix = "",bool
$is_prefix = false): SimpleXMLElement|false
整形式 XML 文字列をオブジェクトとして返します。
パラメータ
data-
整形式 XML 文字列。
class_name-
このオプションのパラメータを使用して、 simplexml_load_file() が指定されたクラスのオブジェクトを返すようにします。 このクラスは、SimpleXMLElement クラスを継承していなければなりません。
options-
追加の Libxml パラメータ を、ビット演算子の
ORで指定します。 namespace_or_prefix-
名前空間プレフィックスあるいは URI。
is_prefix-
namespace_or_prefixがプレフィックスである場合にtrue、 URI である場合にfalse。デフォルトはfalseです。
戻り値
SimpleXMLElement クラスのオブジェクトを返します。
XML ドキュメント内のデータをプロパティに含みます。
失敗した場合に false を返します。
エラー / 例外
XML データ内でエラーが見つかるたびに E_WARNING
エラーメッセージが発生します。
ヒント
libxml_use_internal_errors() ですべての XML エラーを抑制し、 後から libxml_get_errors() で取得することもできます。
例
例1 XML 文字列をパースする
<?php
$string = <<<XML
<?xml version='1.0'?>
<document>
<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);
print_r($xml);
?>上の例の出力は以下となります。
SimpleXMLElement Object ( [title] => Forty What? [from] => Joe [to] => Jane [body] => I know that's the answer -- but what's the question? )
この時点で、$xml->body のようにアクセスすることができます。
参考
- simplexml_load_file() - XMLファイルをパースし、オブジェクトに代入する
- SimpleXMLElement::__construct() - 新しい SimpleXMLElement オブジェクトを作成する
- XML エラーの対応
- libxml_use_internal_errors() - libxmlエラーを無効にし、ユーザーが必要に応じてエラー情報を取得できるようにする
- 基本的な SimpleXML の使用法
＋add a note
User Contributed Notes 22 notes
ascammon at hotmail dot com ¶
13 years ago
I had a hard time finding this documented, so posting it here in case it helps someone:
If you want to use multiple libxml options, separate them with a pipe, like so:
<?php
$xml = simplexml_load_string($string, 'SimpleXMLElement', LIBXML_NOCDATA | LIBXML_NOBLANKS);
?>
Diego Araos, diego at klapmedia dot com ¶
13 years ago
A simpler way to transform the result into an array (requires json module).
<?php
function object2array($object) { return @json_decode(@json_encode($object),1); }
?>
Example:
<?php
$xml_object=simplexml_load_string('<SOME XML DATA');
$xml_array=object2array($xml_object);
?>
meustrus ¶
9 years ago
Be careful checking for parse errors. An empty SimpleXMLElement may resolve to FALSE, and if your XML contains no text or only contains namespaced elements your error check may be wrong. Always use `=== FALSE` when checking for parse errors.
<?php
$xml = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<ns1:Root xmlns:ns1="http://example.com/custom">
<ns1:Node>There's stuff here</ns1:Node>
</ns1:Root>
XML;
$simplexml = simplexml_load_string($xml);
// This prints "Parse Error".
echo ($simplexml ? 'Valid XML' : 'Parse Error'), PHP_EOL;
// But this prints "There's stuff here", proving that
// the SimpleXML object was created successfully.
echo $simplexml->children('http://example.com/custom')->Node, PHP_EOL;
// Use this instead:
echo ($simplexml !== FALSE ? 'Valid XML' : 'Parse Error'), PHP_EOL;
?>
See:
https://bugs.php.net/bug.php?id=31045
https://bugs.php.net/bug.php?id=30972
https://bugs.php.net/bug.php?id=69596
rowan dot collins at gmail dot com ¶
16 years ago
There seems to be a lot of talk about SimpleXML having a "problem" with CDATA, and writing functions to rip it out, etc. I thought so too, at first, but it's actually behaving just fine under PHP 5.2.6
The key is noted above example #6 here:
http://uk2.php.net/manual/en/simplexml.examples.php
"To compare an element or attribute with a string or pass it into a function that requires a string, you must cast it to a string using (string). Otherwise, PHP treats the element as an object."
If a tag contains CDATA, SimpleXML remembers that fact, by representing it separately from the string content of the element. So some functions, including print_r(), might not show what you expect. But if you explicitly cast to a string, you get the whole content.
<?php
$xml = simplexml_load_string('<foo>Text1 & XML entities</foo>');
print_r($xml);
/*
SimpleXMLElement Object
(
[0] => Text1 & XML entities
)
*/
$xml2 = simplexml_load_string('<foo><![CDATA[Text2 & raw data]]></foo>');
print_r($xml2);
/*
SimpleXMLElement Object
(
)
*/
// Where's my CDATA?
// Let's try explicit casts
print_r( (string)$xml );
print_r( (string)$xml2 );
/*
Text1 & XML entities
Text2 & raw data
*/
// Much better
?>
bojan ¶
16 years ago
As was said before don't use var_dump() or print_r() to see SimpleXML object structure as they do not returns always what you expect.
Consider the following:
<?php
// data in xml
$xml_txt = '
<root>
<folder ID="65" active="1" permission="1"><![CDATA[aaaa]]></folder>
<folder ID="65" active="1" permission="1"><![CDATA[bbbb]]></folder>
</root>';
// load xml into SimpleXML object
$xml = simplexml_load_string($xml_txt, 'SimpleXMLElement', LIBXML_NOCDATA);//LIBXML_NOCDATA LIBXML_NOWARNING
// see object structure
print_r($xml);
/* this prints
SimpleXMLElement Object
(
[folder] => Array
(
[0] => aaaa
[1] => bbbb
)
)
*/
// but...
foreach ($xml->folder as $value){
print_r($value);
}
/* prints complete structure of each folder element:
SimpleXMLElement Object
(
[@attributes] => Array
(
[ID] => 65
[active] => 1
[permission] => 1
)
[0] => aaaa
)
SimpleXMLElement Object
(
[@attributes] => Array
(
[ID] => 65
[active] => 1
[permission] => 1
)
[0] => bbbb
)
*/
?>
amir_abiri at ipcmedia dot com ¶
16 years ago
It doesn't seem to be documented anywhere, but you can refer to an element "value" for the purpose of changing it like so:
<?php
$xml = simplexml_load_string('<root><number>1</number></root>');
echo $xml->asXml(). "\n\n";
$xml->number->{0} = $xml->number->{0} + 1;
echo $xml->asXml();
?>
echos:
<?xml version="1.0"?>
<root><number>1</number></root>
<?xml version="1.0"?>
<root><number>2</number></root>
However, this only works with a direct assignment, not with any of the other operators:
<?php
$xml = simplexml_load_string('<root><number>1</number></root>');
echo $xml->asXml(). "\n\n";
$xml->number->{0} += 1;
// Or:
$xml->number->{0}++;
echo $xml->asXml();
?>
Both of the above cases would result in:
<?xml version="1.0"?>
<root><number>1</number></root>
<?xml version="1.0"?>
<root><number>1<0/></number></root>
nbijnens at servs dot eu ¶
17 years ago
Please note that not all LIBXML options are supported with the options argument.
For instance LIBXML_XINCLUDE does not work. But there is however a work around:
<?php
$xml = new DOMDocument();
$xml->loadXML ($XMLString);
$xml->xinclude();
$xml = simplexml_import_dom($xml);
?>
hattori at hanso dot com ¶
17 years ago
Theres a problem with the below workaround when serializing fields containing html CDATA. For any other content type then HTML try to modfiy function parseCDATA.
Just add these lines before serializing.
This is also a workaround for this bug http://bugs.php.net/bug.php?id=42001
<?PHP
if(strpos($content, '<![CDATA[')) {
function parseCDATA($data) {
return htmlentities($data[1]);
}
$content = preg_replace_callback(
'#<!\[CDATA\[(.*)\]\]>#',
'parseCDATA',
str_replace("\n", " ", $content)
);
}
?>
mindpower ¶
17 years ago
A simple extension that adds a method for retrieving a specific attribute:
<?php
class simple_xml_extended extends SimpleXMLElement
{
public function Attribute($name)
{
foreach($this->Attributes() as $key=>$val)
{
if($key == $name)
return (string)$val;
}
}
}
$xml = simplexml_load_string('
<xml>
<dog type="poodle" owner="Mrs Smith">Rover</dog>
</xml>', 'simple_xml_extended');
echo $xml->dog->Attribute('type');
?>
outputs 'poodle'
I prefer to use this technique rather than typecasting attributes.
javalc6 at gmail dot com ¶
16 years ago
I wanted to convert an array containing strings and other arrays of the same type into a simplexml object.
Here is the code of the function array2xml that I've developed to perform this conversion. Please note that this code is simple without any checks.
<?php
function array2xml($array, $tag) {
function ia2xml($array) {
$xml="";
foreach ($array as $key=>$value) {
if (is_array($value)) {
$xml.="<$key>".ia2xml($value)."</$key>";
} else {
$xml.="<$key>".$value."</$key>";
}
}
return $xml;
}
return simplexml_load_string("<$tag>".ia2xml($array)."</$tag>");
}
$test['type']='lunch';
$test['time']='12:30';
$test['menu']=array('entree'=>'salad', 'maincourse'=>'steak');
echo array2xml($test,"meal")->asXML();
?>
Bob ¶
15 years ago
Here is my simple SimpleXML wrapper function.
As far as I can tell, it does the same as Julio Cesar Oliveira's (above).
It parses an XML string into a multi-dimensional associative array.
The second argument is a callback that is run on all data (so for example, if you want all data trimmed, like Julio does in his function, just pass 'trim' as the second arg).
<?php
function unserialize_xml($input, $callback = null, $recurse = false)
/* bool/array unserialize_xml ( string $input [ , callback $callback ] )
* Unserializes an XML string, returning a multi-dimensional associative array, optionally runs a callback on all non-array data
* Returns false on all failure
* Notes:
* Root XML tags are stripped
* Due to its recursive nature, unserialize_xml() will also support SimpleXMLElement objects and arrays as input
* Uses simplexml_load_string() for XML parsing, see SimpleXML documentation for more info
*/
{
// Get input, loading an xml string with simplexml if its the top level of recursion
$data = ((!$recurse) && is_string($input))? simplexml_load_string($input): $input;
// Convert SimpleXMLElements to array
if ($data instanceof SimpleXMLElement) $data = (array) $data;
// Recurse into arrays
if (is_array($data)) foreach ($data as &$item) $item = unserialize_xml($item, $callback, true);
// Run callback and return
return (!is_array($data) && is_callable($callback))? call_user_func($callback, $data): $data;
}
?>
AllenJB ¶
12 years ago
<?php
$xml = json_decode(json_encode((array) simplexml_load_string($string)), 1);
?>
A reminder that json_encode attempts to convert data to UTF-8 without specific knowledge of the source encoding. This method can cause encoding issues if you're not working in UTF-8.
Julio Cesar Oliveira ¶
15 years ago
The XML2Array func now Recursive!
<?php
function XML2Array ( $xml , $recursive = false )
{
if ( ! $recursive )
{
$array = simplexml_load_string ( $xml ) ;
}
else
{
$array = $xml ;
}
$newArray = array () ;
$array = ( array ) $array ;
foreach ( $array as $key => $value )
{
$value = ( array ) $value ;
if ( isset ( $value [ 0 ] ) )
{
$newArray [ $key ] = trim ( $value [ 0 ] ) ;
}
else
{
$newArray [ $key ] = XML2Array ( $value , true ) ;
}
}
return $newArray ;
}
?>
artistan at gmail dot com ¶
9 years ago
Here is my update to Bob's simple SimpleXML wrapper function.
I noticed his version would turn an empty SimpleXMLElement into an empty array.
<?php
/**
* http://php.net/manual/en/function.simplexml-load-string.php#91564
*
* bool/array unserialize_xml ( string $input [ , callback $callback ] )
* Unserializes an XML string, returning a multi-dimensional associative array, optionally runs a callback on all non-array data
* Returns false on all failure
* Notes:
* Root XML tags are stripped
* Due to its recursive nature, unserialize_xml() will also support SimpleXMLElement objects and arrays as input
* Uses simplexml_load_string() for XML parsing, see SimpleXML documentation for more info
*
* @param $input
* @param null $callback
* @param bool $recurse
* @return array|mixed
*
*/
function unserialize_xml($input, $callback = null, $recurse = false)
{
// Get input, loading an xml string with simplexml if its the top level of recursion
$data = ((!$recurse) && is_string($input))? simplexml_load_string($input): $input;
// Convert SimpleXMLElements to array
if ($data instanceof SimpleXMLElement){
if(!empty($data)){
$data = (array) $data;
} else {
$data = '';
}
}
// Recurse into arrays
if (is_array($data)) foreach ($data as &$item) $item = unserialize_xml($item, $callback, true);
// Run callback and return
return (!is_array($data) && is_callable($callback))? call_user_func($callback, $data): $data;
}
?>
Anonymous ¶
12 years ago
Use libxml_disable_entity_loader() to restrict loading of external files. See http://www.idontplaydarts.com/2011/02/scanning-the-internal-network-using-simplexml/
jeff at creabilis dot com ¶
15 years ago
If you want to set the charset of the outputed xml, simply set the encoding attribute like this :
<?php simplexml_load_string('<?xml version="1.0" encoding="utf-8"?><xml/>'); ?>
The generated xml outputed by $xml->asXML will containt accentuated characters like 'é' instead of é.
Hope this help