How to make hashtag on my website?

[Mister.Chrispy]

I would say learn some more PHP, and MySQL since you'll want databases to store your messages. Then with some basic regular expressions you can extract #hashtagged words and convert them to links to search for the #hashtag when displaying a message and some basic MySQL queries to search for messages that contain said #hashtag.

Maybe
<?php
function hashToAnchor( $message ) {
return preg_replace( '/#(\w.)/g' , '<a href = "/search?q=${1}' , $message );
}
?>
To add links to messages

and maybe
<?php
$q = $_GET['q'];
mysql_query( "SELECT * FROM table WHERE message LIKE \"%#$q%\"");
?>
to retrieve messages containing a certain hash tag


Sample code is incomplete and probably inaccurate, just something to (hopefully) point you in the right direction on your journey into databases and searching. Good luck!