- array_map: documentation ( source)
- print_r: documentation ( source)
<?php
$markup = <<<XML
<root>
<label name="Pippo"></label>
<label name="Caio"></label>
<label name="Sempronio"></label>
</root>
XML;
$xml = new SimpleXMLElement($markup);
$elements = $xml->xpath('/root/label//@name');
$names = array_map(fn(SimpleXMLElement $element) => (string) $element, $elements);
print_r($names);