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    DOMXPath::registerPhpFunctions

    (PHP 5 >= 5.3.0, PHP 7, PHP 8)

    DOMXPath::registerPhpFunctions — Register PHP functions as XPath functions

    Beschreibung

    public DOMXPath::registerPhpFunctions(string|array|null $restrict = null): void

    This method enables the ability to use PHP functions within XPath expressions.

    Parameter-Liste

    restrict

    Use this parameter to only allow certain functions to be called from XPath.

    This parameter can be either a string (a function name) or an array of function names.

    Rückgabewerte

    Es wird kein Wert zurückgegeben.

    Beispiele

    The following examples use book.xml which contains the following:

    Beispiel #1 book.xml

    <?xml version="1.0" encoding="UTF-8"?>
<books>
 <book>
  <title>PHP Basics</title>
  <author>Jim Smith</author>
  <author>Jane Smith</author>
 </book>
 <book>
  <title>PHP Secrets</title>
  <author>Jenny Smythe</author>
 </book>
 <book>
  <title>XML basics</title>
  <author>Joe Black</author>
 </book>
</books>

    Beispiel #2 DOMXPath::registerPHPFunctions() with php:functionString

    <?php
    $doc     = new DOMDocument;
    $doc->load('book.xml');

    $xpath = new DOMXPath($doc);

    // Register the php: namespace (required)
    $xpath->registerNamespace("php", "http://php.net/xpath");

    // Register PHP functions (no restrictions)
    $xpath->registerPHPFunctions();

    // Call substr function on the book title
    $nodes = $xpath->query('//book[php:functionString("substr", title, 0, 3) = "PHP"]');

    echo     "Found {$nodes->length} books starting with 'PHP':\n";
    foreach (    $nodes as $node) {
    $title = $node->getElementsByTagName("title")->item(0)->nodeValue;
    $author = $node->getElementsByTagName("author")->item(0)->nodeValue;
    echo     "$title by $author\n";
    }

    ?>

    Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    Found 2 books starting with 'PHP':
PHP Basics by Jim Smith
PHP Secrets by Jenny Smythe

    Beispiel #3 DOMXPath::registerPHPFunctions() with php:function

    <?php
    $doc     = new DOMDocument;
    $doc->load('book.xml');

    $xpath = new DOMXPath($doc);

    // Register the php: namespace (required)
    $xpath->registerNamespace("php", "http://php.net/xpath");

    // Register PHP functions (has_multiple only)
    $xpath->registerPHPFunctions("has_multiple");

    function     has_multiple($nodes) {
    // Return true if more than one author
    return count($nodes) > 1;
    }
    // Filter books with multiple authors
    $books = $xpath->query('//book[php:function("has_multiple", author)]');

    echo     "Books with multiple authors:\n";
    foreach (    $books as $book) {
    echo     $book->getElementsByTagName("title")->item(0)->nodeValue . "\n";
    }

    ?>

    Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    Books with multiple authors:
PHP Basics

    Siehe auch

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