Edit Report a Bug

    DOMXPath::registerPhpFunctions

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

    DOMXPath::registerPhpFunctions — Register PHP functions as XPath functions

    Descrizione

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

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

    Elenco dei parametri

    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.

    Valori restituiti

    Nessun valore viene restituito.

    Esempi

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

    Example #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>

    Example #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";
    }

    ?>

    Il precedente esempio visualizzerà qualcosa simile a:

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

    Example #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";
    }

    ?>

    Il precedente esempio visualizzerà qualcosa simile a:

    Books with multiple authors:
PHP Basics

    Vedere anche:

    add a note add a note

    User Contributed Notes

    There are no user contributed notes for this page.
    To Top