DOMXPath::registerPhpFunctions

(PHP 5 >= 5.3.0, PHP 7)

DOMXPath::registerPhpFunctionsRegister PHP functions as XPath functions

Opis

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

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

Parametry

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.

Zwracane wartości

Nie jest zwracana żadna wartość.

Przykłady

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

Przykład #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>

Przykład #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";
}

?>

Powyższy przykład wyświetli coś podobnego do:

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

Przykład #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";
}

?>

Powyższy przykład wyświetli coś podobnego do:

Books with multiple authors:
PHP Basics

Zobacz też:

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