DOMXPath::registerNamespace

    (PHP 5, PHP 7, PHP 8)

    DOMXPath::registerNamespace — Регистрирует пространство имён с объектом DOMXPath

    Описание

    public DOMXPath::registerNamespace(string $prefix, string $namespace): bool

    Регистрирует URI пространства имён namespace и префикс prefix с объектом DOMXPath.

    Список параметров

    prefix

    Префикс.

    namespace

    URI пространства имён.

    Возвращаемые значения

    Функция возвращает true, если выполнилась успешно, или false, если возникла ошибка.

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    Инструкция • Исправление • Сообщение об ошибке
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    Примечания пользователей 6 notes

    up
    25
    spam at spam dot spam
    20 years ago
    It is mentioned in a few places on the web, but it wasn't mentioned here. You need to use this function to set up a prefix for the default namespace of a document.

    For instance, if you are trying to parse a Microsoft Spreadsheet XML file, which has the default namespace of "urn:schemas-microsoft-com:office:spreadsheet":

    $doc = DOMDocument::load("my_spreadsheet.xml);
    $xpath = new DOMXPath($doc);
    $xpath->registerNamespace("m",
    "urn:schemas-microsoft-com:office:spreadsheet");
    $query = '/m:Workbook/m:Worksheet[1]/m:Table';
    $result = $xpath->query($query, $doc);

    You can use anything in place of the 'm', but you have to specify something! Just asking for "/Workbook/Worksheet/Table" doesn't work.
    up
    9
    cameron kellough
    18 years ago
    This is called prefix mapping and it is necessary to use xpath to handle documents which have default namespaces. //root/item will search for items with no namespace, not items with the namespace described as the default in the xmlns declaration. This problem is maddening as it just looks on the surface like xpath isn't working.
    up
    9
    dulao5 at gmail dot com
    16 years ago
    The following code can work for XML default namespace.
    <?php
    $xml     = <<<EOT
    <?xml version="1.0" encoding="UTF-8"?>
    <entry xmlns="http://www.w3.org/2005/Atom" xmlns:other="http://other.w3.org/other" >
    <id>uYG7-sPwjFg</id>
    <published>2009-05-17T18:29:31.000Z</published>
    </entry>
    EOT;

    $doc = new DOMDocument;
    $doc->loadXML($xml);
    $xpath = DOMXPath($doc);

    $xpath->registerNamespace('atom', "http://www.w3.org/2005/Atom");

    $xpath_str = '//atom:entry/atom:published/text()';

    $entries = $xpath->evaluate($xpath_str);

    print     $entries->item(0)->nodeValue ."\n";

    ?>
    up
    4
    igor dot pellegrini at diespam-berlinonline dot de
    10 years ago
    The documentation is not really detailed.
    Probably someone is also interested in the possibility of unregistering the namespace.

    Worths to note that the original libxml function "xmlXPathRegisterNs()"

    * Does NOT accept NULL or empty string for the argument "$prefix".

    and

    * Unregisters the namespace if the "$namespaceURI" argument is NULL.

    Here the documentation:
    http://xmlsoft.org/html/libxml-xpathInternals.html#xmlXPathRegisterNs
    up
    2
    xmedeko at gmail dot com
    14 years ago
    A general way to register the root default namespace:

    <?php
    $xml     = new DomDocument();
    $xml->load('data.xml');
    $xpath = new DOMXPath($xml);
    $rootNamespace = $xml->lookupNamespaceUri($xml->namespaceURI);
    $xpath->registerNamespace('x', $rootNamespace);
    ?>

    And then just query:

    <?php $elementList = $xpath->query('//x:items/x:name'); ?>
    up
    -3
    agent009
    16 years ago
    Ok, here's a function that extends XPath syntax with the following special characters:

    ~ inserts default namespace prefix if defined

    # shorthand for text()

    % shorthand for comment()

    $ shorthand for node()

    ?* shorthand for processing-instruction()

    ?foo shorthand for processing-instruction("foo")

    ? shorthand for processing-instruction("")

    ^ escapes following character (with literal or SGML entity as needed)

    All of the above except ^ are ignored within quoted strings

    <?php
    function extendXPath($str, $defns = NULL) {
    $quote = false;
    $map = array(
    '~' => isset($defns) ? "$defns:" : '',
    '#' => 'text()',
    '%' => 'comment()',
    '$' => 'node()'
    );
    $out = '';

    for (    $i = 0, $len = strlen($str); $i < $len; $i++) {
    $c = $str[$i];
    if (!    $quote && array_key_exists($c, $map)) {
    $out .= $map[$c];
    } else switch (    $c) {
    case     '^':
    $out .= htmlspecialchars($str[++$i], ENT_QUOTES);
    break;
    case     '?':
    if (    $quote) {
    $out .= $c;
    } elseif (    $str[$i + 1] == '*') {
    $out .= 'processing-instruction()';
    $i++;
    } else {
    preg_match('/^\w+/', substr($str, $i + 1), $matches);
    $out .= 'processing-instruction("'.$matches[0].'")';
    $i += strlen($matches[0]);
    };
    break;
    case     '"':
    $quote = !$quote;
    default:
    $out .= $c;
    };
    };

    return     $out;
    }
    ?>
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