- array_reverse: documentation ( source)
- explode: documentation ( source)
- parse_url: documentation ( source)
<?php
function get_host($url) {
$host = parse_url($url, PHP_URL_HOST);
$names = explode(".", $host);
if(count($names) == 1) {
return $names[0];
}
$names = array_reverse($names);
return $names[1] . '.' . $names[0];
}
echo get_host('https://google.com'); // google.com
echo "\n";
echo get_host('https://www.google.com'); // google.com
echo "\n";
echo get_host('https://sub1.sub2.google.com'); // google.com
echo "\n";
echo get_host('http://localhost'); // localhost