<?php

$xml = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<root>
    <book id="1" name="Book1" genre="Fantasy" />
    <book id="2" name="Book2" genre="Novel" />
</root>
XML;

$xml = simplexml_load_string($xml);

$book_name = $xml->xpath("/root/book[@id='1']/@name");
print_r($book_name);

echo $book_name[0]->attributes()->name;

?>

Array
(
    [0] => SimpleXMLElement Object
        (
            [@attributes] => Array
                (
                    [name] => Book1
                )

        )

)