Question

Is there a function like “getAllChildrenByTagName” in PHP?

$dom = new DOMDocument();
$dom->loadXML('<p><a id="1">test 1</a><span><a id="2">test 2</a></span></p>');
foreach($dom->getElementsByTagName('a') AS $node)
    echo($node->textContent);

Here i only want the a-Tag with “id = 1”. Is it possible?

Answer 1

You can to use XPath to directly grab the element you’re looking for:

$dom = new DOMDocument();
$dom->loadXML('<p><a id="1">test 1</a><span><a id="2">test 2</a></span></p>');

$xpath = new DOMXpath( $dom);
$a = $xpath->query( '//a[@id="1"]')->item( 0);
echo $a->textContent;

This will print:

test 1