DOMXPath::registerPhpFunctions

(PHP 5 >= 5.3.0)

DOMXPath::registerPhpFunctions — Register PHP functions as XPath functions

Açıklama

public void DOMXPath::registerPhpFunctions ([ mixed $restrict ] )

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

Değiştirgeler

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.

Dönen Değerler

Hiçbir değer dönmez.

Örnekler

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

Örnek 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>

Örnek 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";
}

?>

Yukarıdaki örnek şuna benzer bir çıktı üretir:

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

Örnek 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";
}

?>

Yukarıdaki örnek şuna benzer bir çıktı üretir:

Books with multiple authors:
PHP Basics

Ayrıca Bakınız

DOMXPath::registerNamespace() - Belirtilen isim alanını DOMXPath nesnesi ile ilişkilendirir
DOMXPath::query() - Belirtilen XPath ifadesini değerlendirir
DOMXPath::evaluate() - Belirtilen XPath ifadesini çözümler ve mümkünse yazılı bir sonuç verir

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