php - 删除域扩展

Question

假设我有 just-a.domain.com,just-a-domain.info,just.a-domain.net 如何删除扩展名 .com， .net.info ... 我需要两个变量中的结果，一个是域名，另一个是扩展名。

我尝试使用 str_replace 但不起作用，我想只能使用正则表达式....

Answer 1

  preg_match('/(.*?)((?:\.co)?.[a-z]{2,4})$/i', $domain, $matches);

$matches[1] 将具有域，$matches[2] 将具有扩展名

<?php

$domains = array("google.com", "google.in", "google.co.in", "google.info", "analytics.google.com");

foreach($domains as $domain){
  preg_match('/(.*?)((?:\.co)?.[a-z]{2,4})$/i', $domain, $matches);
  print_r($matches);
}
?>

将产生输出

Array
(
    [0] => google.com
    [1] => google
    [2] => .com
)
Array
(
    [0] => google.in
    [1] => google
    [2] => .in
)
Array
(
    [0] => google.co.in
    [1] => google
    [2] => .co.in
)
Array
(
    [0] => google.info
    [1] => google
    [2] => .info
)
Array
(
    [0] => analytics.google.com
    [1] => analytics.google
    [2] => .com
)