SimpleXMLElement::xpath

(PHP 5, PHP 7, PHP 8)

SimpleXMLElement::xpath — Runs XPath query on XML data

说明

public SimpleXMLElement::xpath ( string $expression ) : array|null|false

The xpath method searches the SimpleXML node for children matching the XPath expression.

参数

expression

An XPath path

返回值

Returns an array of SimpleXMLElement objects on success; or null or false in case of an error.

范例

示例 #1 Xpath

<?php
$string = <<<XML
<a>
 <b>
  <c>text</c>
  <c>stuff</c>
 </b>
 <d>
  <c>code</c>
 </d>
</a>
XML;

$xml = new SimpleXMLElement($string);

/* Search for <a><b><c> */
$result = $xml->xpath('/a/b/c');

while(list( , $node) = each($result)) {
    echo '/a/b/c: ',$node,"\n";
}

/* Relative paths also work... */
$result = $xml->xpath('b/c');

while(list( , $node) = each($result)) {
    echo 'b/c: ',$node,"\n";
}
?>

以上例程会输出：

/a/b/c: text
/a/b/c: stuff
b/c: text
b/c: stuff

Notice that the two results are equal.

参见