why string change to zero?

Question

<?php

$link='http://oxu.az/interesting/206815';

$site=file_get_contents($link);

$number='@<span class="stats-i">(.*?)</span>@';

preg_match_all($number,$site,$num);

$nums=$num[0][0];
echo var_dump($nums), "<br>";
$reqem=($nums+5);

echo ($reqem);

?>

Answer 1

https://www.sololearn.com/discuss/571199/?ref=app