How to wrap a hashtag in a link?

Question

PHP

How to wrap a hashtag in a link?
Something like this
#sky #sea
in the code should turn out

<a href="tag/небо">#небо</a> <a href="tag/море">#море</a>

Answer 1

$string = '#небо #море';
echo preg_replace('/#([a-zа-я0-9]+)/ui', '<a href="tag/$1">#$1</a>', $string);

Answer 2

https://www.google.ru/search?q=php+hashtag+to+link