SimpleXMLElement::xpath

(PHP 5, PHP 7, PHP 8)

SimpleXMLElement::xpath — XML データに Xpath クエリを実行する

説明

public SimpleXMLElement::xpath(string $expression): array|null|false

xpathメソッドは、 XPath expressionにマッチする SimpleXML ノードを検索します。

パラメータ

expression: XPath パス。

戻り値

SimpleXMLElement オブジェクトの配列を返します。エラーが発生した場合は null または false を返します。

例

例1 Xpath

<?php
$string = <<<XML
<a>
 <b>
  <c>text</c>
  <c>stuff</c>
 </b>
 <d>
  <c>code</c>
 </d>
</a>
XML;

$xml = new SimpleXMLElement($string);

/* <a><b><c> を探します */
$result = $xml->xpath('/a/b/c');

foreach ($result as $node) {
    echo '/a/b/c: ',$node,"\n";
}

/* 相対パスでも動作します... */
$result = $xml->xpath('b/c');

foreach ($result as $node) {
    echo 'b/c: ',$node,"\n";
}
?>

上の例の出力は以下となります。

/a/b/c: text
/a/b/c: stuff
b/c: text
b/c: stuff

これら二つの結果は同じであることに注意してください。

参考

SimpleXMLElement::registerXPathNamespace() - 次の XPath クエリ用の prefix/ns コンテキストを作成する
SimpleXMLElement::getDocNamespaces() - ドキュメントで宣言されている名前空間を返す
SimpleXMLElement::getNamespaces() - ドキュメントで使用している名前空間を返す
基本的な SimpleXML の使用法

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User Contributed Notes 10 notes

down

leonjanzen at gmail dot com ¶

10 years ago

To run an xpath query on an XML document that has a namespace, the namespace must be registered with SimpleXMLElement::registerXPathNamespace() before running the query. If the XML document namespace does not include a prefix, you must make up an arbitrary one, and then use it in your query.

<?php
$strXml= <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<mydoc xmlns="http://www.url.com/myns">
    <message>Test message</message>
</mydoc>
XML;

$xmlDoc=new \SimpleXMLElement($strXml);

foreach($xmlDoc->getDocNamespaces() as $strPrefix => $strNamespace) {
    if(strlen($strPrefix)==0) {
        $strPrefix="a"; //Assign an arbitrary namespace prefix.
    }
    $xmlDoc->registerXPathNamespace($strPrefix,$strNamespace);
}

print($xmlDoc->xpath("//a:message")[0]); //Use the arbitrary namespace prefix in the query.
?>

This will output:

Test message

down

grummfy at gmail dot com ¶

14 years ago

On a xml that have namespace you need to do this before your xpath request (or empty array will be return) :



<?php

$string = str_replace('xmlns=', 'ns=', $string); //$string is a string that contains xml...

?>

down

drewish at katherinehouse dot com ¶

19 years ago

xpath() can also be used to select elements by their attributes. For a good XPath reference check out: http://www.w3schools.com/xpath/xpath_syntax.asp



<?php

$string = <<<XML

<sizes>

    <size label="Square" width="75" height="75" />

    <size label="Thumbnail" width="100" height="62" />

    <size label="Small" width="112" height="69" />

    <size label="Large" width="112" height="69" />

</sizes>

XML;



$xml = simplexml_load_string($string);

$result = $xml->xpath("//size[@label='Large']");



// print the first (and only) member of the array

echo $result[0]->asXml();

?>



The script would print: 

<size label="Large" width="112" height="69"/>

down

Filippo Vicari ¶

2 years ago

You can also search for siblings with a condition. For example immagine to need the title for a desidered language which with the two siblings tags in this XML file

<?xml version="1.0" encoding="UTF-8"?>
<IDOC BEGIN="1">
...
<PRODUCT SEGMENT="1">
    <PRODUCTCODE>005</PRODUCTCODE>
    <LANG>E</LANG>
    <TITLE>Name</TITLE>
    <LANG_ISO>EN</LANG_ISO>
</PRODUCT>
<PRODUCT SEGMENT="1">
    <PRODUCTCODE>005</PRODUCTCODE>
    <LANG>I</LANG>
    <TITLE>Name I</TITLE>
    <LANG_ISO>IT</LANG_ISO>
</PRODUCT>
...  
</IDOC>

Let's break it down
<?php
"//PRODUCT" // find product tag
"//PRODUCT/LANG[.='E']" // whithin it find lang == "E"
"//PRODUCT/LANG[.='E']/../"  // go up one step
"//PRODUCT/LANG[.='E']/../TITLE" // get the title Tag content

// Combined search and find siblings ----------------------------
$xml = simplexml_load_file("fname.xml");

// Search for the TITLE field which sibling is == "E" ----------
$title_E_array = $xml->xpath("//PRODUCT/LANG[.='E']/../TITLE"); // By default gives back an array of  SimpleXmlElement 
$title = (string) $xml->xpath("//PRODUCT/LANG[.='E']/../TITLE")[0]; // in this way saves only the value as a string
?>

down

anemik ¶

16 years ago

If you want to find easly all records satisfying some condition in XML data like 



....

   <book id="bk101">

      <author>Gambardella, Matthew</author>

      <title>XML Developer's Guide</title>

      <genre>Computer</genre>

      <price>44.95</price>

   </book>

   <book id="bk102">

      <author>Ralls, Kim</author>

      <title>Midnight Rain</title>

      <genre>Fantasy</genre>

      <price>5.95</price>

   </book>

...



try example below



<?php



$xmlStr = file_get_contents('data/books.xml');

$xml = new SimpleXMLElement($xmlStr);

// seach records by tag value:

// find all book records with price higher than 40$

$res = $xml->xpath("book/price[.>'40']/parent::*");

print_r($res);



?>



You will see response like:

Array (

[0] => SimpleXMLElement Object

        (

            [@attributes] => Array

                (

                    [id] => bk101

                )



            [author] => Gambardella, Matthew

            [title] => XML Developer's Guide

            [genre] => Computer

            [price] => 44.95

            [publish_date] => 2000-10-01

            [description] => An in-depth look at creating applications 

      with XML.

        )

...

down

canuemail at gmail dot com ¶

16 years ago

If you want to search multiple values from xml on the behalf or one value then this code can be helpfull to you.



if there is:

<Record>

  <country>Pakistan</country>

  <code>+92</code>

  <Value>100<Value>

</Record>



then try this one:

<?php

$sxe =  simplexml_load_file("countries.XML");

foreach($sxe->xpath('//RECORD') as $item) {



    $row = simplexml_load_string($item->asXML());

    $v = $row->xpath('//country[. ="Pakistan"]');

    if($v[0]){

        print $item->country;

        print $item->code;

        print $item->value;

    }

    

}

?>

down

Anonymous ¶

9 years ago

As mentioned already xpath will fail is the default namespace 'xmlns' is used like in:

<?php

$xmlstring = $string = <<<XML
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
    <fileVersion appName="xl" />
</workbook>
XML;
?>

xpath cannot search through the xml without explicitly specifying a namespace.
There are 2 options :
1. rename the 'xmlns' into something else to trick xpath into believing that no default namespace is defined.
2. register a string as the default namespace and use that string in all your queries. Unfortunatly, an empty space will not work.
No other option currently exist until XPath2.0 becomes the default library.

down

awoerl at contentserv dot com ¶

7 years ago

I tried to use string functions in the xpath statements I'm passing, like

$oXml->xpath('substring(/foo/bar/text(), 0, 4)');

But no matter which syntax I'm trying I never the string functions to work. 

Is it possible, that the xpath method does not support function calls?

down

yetihehe at yetihehe dot com ¶

13 years ago

Xpath actually knows which element is root regardless of element on which you execute it. Example:

<?php

$string = <<<XML
<a>
 <b>
  <c>text</c>
  <c>stuff</c>
 </b>
 <b>
  <c>code</c>
 </b>
</a>
XML;

header('content-type: text/plain');

$xml = new SimpleXMLElement($string);

//relative to root
$b0=$xml->b[0]->xpath('//c');
while(list( , $node) = each($b0)) {
    echo 'b[0]: //c: ',$node,"\n";
}

$b1=$xml->b[1]->xpath('//c');
while(list( , $node) = each($b1)) {
    echo 'b[1]: //c: ',$node,"\n";
}

echo "\n";

//relative to current element
$b0=$xml->b[0]->xpath('.//c');
while(list( , $node) = each($b0)) {
    echo 'b[0]: .//c: ',$node,"\n";
}

$b1=$xml->b[1]->xpath('.//c');
while(list( , $node) = each($b1)) {
    echo 'b[1]: .//c: ',$node,"\n";
}

?>

Will return:
b[0]: //c: text
b[0]: //c: stuff
b[0]: //c: code
b[1]: //c: text
b[1]: //c: stuff
b[1]: //c: code

b[0]: .//c: text
b[0]: .//c: stuff
b[1]: .//c: code

down

paul at pmtlogic dot com ¶

16 years ago

xpath doesn't seem to be able to handle single quotes embedded in the query itself. For instance, I want to find geo coordinates in an xml file based on country name. 



xml snippet:



<zones>

<zone country="Cote d'Ivoire" fullName="Yamoussoukro" geo="6.82,-5.28" id="1050"><url prefix="1001" value="fiji.html" /><url prefix="1002" value="C" /></zone>

</zones>



The following code does not work:



<?php

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

$result = $xml->xpath("//zone[@country='Cote d\'Ivoire']");



foreach ( $result[0]->attributes() as $key => $val ) {

    print "<div class='coords'>$key: $val</div>\n";

}

?>



I have tried many variations on the embedded single quote (i.e. escape codes) but with no result. W3C offers no explanation either. 



In addition, there doesn't seem to be any way of embedding wildcards in the attribute value (you can embed wildcards in the attribute name). Otherwise the following might be a reasonable substitute in this context:



<?php $result = $xml->xpath("//zone[@country='Cote d*Ivoire']"); ?>

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