DOMXPath::evaluate
PHP function
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(PHP 5 >= 5.1.0, PHP 7, PHP 8)
Evaluates the given XPath expression and returns a typed result if possible
Description
DOMXPath::evaluate(string $expression, DOMNode|null $contextNode = null, bool $registerNodeNS = true): mixed
Executes the given XPath expression and returns a typed result if possible.
Parameters
expressionThe XPath expression to execute.
contextNodeThe optional
contextNodecan be specified for doing relative XPath queries. By default, the queries are relative to the root element.
Return Values
Returns a typed result if possible or a DOMNodeList containing all nodes matching the given XPath expression.
If the expression is malformed or the contextNode is invalid, DOMXPath::evaluate returns false.
Examples
Getting the count of all the english books
php
<?php
$doc = new DOMDocument;
$doc->load('examples/book-dcobook.xml');
$xpath = new DOMXPath($doc);
$tbody = $doc->getElementsByTagName('tbody')->item(0);
// our query is relative to the tbody node
$query = 'count(row/entry[. = "en"])';
$entries = $xpath->evaluate($query, $tbody);
echo "There are $entries english books\n";
?>The above example will output:
output
There are 2 english booksSee Also
DOMXPath::query