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截取當前域名的前綴

<?php 
$domain = $_SERVER['HTTP_HOST'];
if (strpos($domain, 'https://') > -1 || strpos($domain, 'http://') > -1) {
$arr1 = explode('//', $domain);
$domain = $arr1[1];
}
$arr2 = explode('.', $domain);
unset($arr2[count($arr2) - 1]);
unset($arr2[count($arr2) - 1]);
$sub_domain = implode('.', $arr2);
?>

www.baidu.com 截取 www

1.2.baidu.com 截取1.2