如何使用file_get_contents php中的值作为数字？

Question

How to use value from file_get_contents php as a number ?

I want to use $val in this case = 50.0001 plus with 20 it's will be result 70.0001 But when i test it's show 0 why ? how can i do ?

<?php
$html = file_get_contents('https://www.example.com');
$doc = new DOMDocument();
libxml_use_internal_errors(true);
$doc->loadHTML($html);
$finder = new DomXPath($doc);
$node = $finder->query("//*[contains(@class, 'test')]");
$val = $doc->saveHTML($node->item(0));
$result = $val + 20;
echo $result;
?>

and https://www.example.com

<span class="test">50.0001</span>

Answer 1

只需从节点获取textcontent即可，不要使用saveHTML。

$val = $node->item(0)->textContent;