仅从URL字符串中获取网站名称

Question

我还有像http://www.google.com/recaptcha/api/img/clean/logo.png这样的网址字符串，如何从网址中仅提取google.com？我想在我的所有URL字符串上执行此操作。

Answer 1

尝试功能parse_url()

<?php
$url =  'http://www.google.com/recaptcha/api/img/clean/logo.png';
$array = parse_url($url);

echo $array['host'];

Answer 2

<?php    
echo $_SERVER['SERVER_NAME'];
?>