php/regex：“linkify”博客标题

我正在尝试编写一个简单的 PHP 函数，它可以接受像这样的字符串

Topic: Some stuff, Maybe some more, it's my stuff?

并返回

topic-some-stuff-maybe-some-more-its-my-stuff

As such:

• 小写
• 删除所有非字母数字非空格字符
• 用连字符替换所有空格（或空格组）

我可以用一个正则表达式来做到这一点吗？

function Slug($string)
{
    return strtolower(trim(preg_replace('~[^0-9a-z]+~i', '-', html_entity_decode(preg_replace('~&([a-z]{1,2})(?:acute|cedil|circ|grave|lig|orn|ring|slash|th|tilde|uml);~i', '$1', htmlentities($string, ENT_QUOTES, 'UTF-8')), ENT_QUOTES, 'UTF-8')), '-'));
}

$topic = 'Iñtërnâtiônàlizætiøn';
echo Slug($topic); // internationalizaetion

$topic = 'Topic: Some stuff, Maybe some more, it\'s my stuff?';
echo Slug($topic); // topic-some-stuff-maybe-some-more-it-s-my-stuff

$topic = 'here عربي‎ Arabi';
echo Slug($topic); // here-arabi

$topic = 'here 日本語 Japanese';
echo Slug($topic); // here-japanese