从域名字符串中删除“www。”

Question

How do I remove "www." from the url if it comes in the beginning only.

www.google.com --> google.com

I have tried the following so far, but this removes the "www." if it is in any place :

str_ireplace('www.','',$parsed_url); 

Thanks in advance.

Answer 1

$a = "www.google.com";
echo preg_replace ("~^www\.~", "", $a);