如何删除字符串中倒数第二个点之前的所有内容

Question

I am trying to make a function that removes everything before the second to last dot. If the string is something like www.dev.community.google.com then I want to remove everything before google.com.

These sub domains aren't always alike, sometimes they will just be www.google.com and sometimes www.community.google.com.

So the point is to remove everything before and including the second to last dot. How can I do this with php?

Answer 1

Following solution will work for all kinds of url:

<?php

function getDomain($url)
{
    $exp = explode('.', $url);
    $count = count($exp);
    $tmp_arr[0] = $exp[$count-2];
    $tmp_arr[1] = $exp[$count-1];
    $final_str = implode('.', $tmp_arr);
    return $final_str;
}

$url = 'www.dev.community.google.com';
echo getDomain($url);

echo '<br/>';

$url = 'www.community.com';
echo getDomain($url);
?>

Output

google.com

community.com

Here is the working demo link.