Handle Facebook Graph Markup http://stackoverflow.com/q/27347844/1515819

Facebook Graph Markup

function get_html_description($description) {
    return 
        // 1. Handle tags (pages, people, etc.)
        preg_replace_callback("/@\[([0-9]*):([0-9]*):(.*?)\]/", function($match) {
            return '<a href="http://facebook.com/'.$match[1].'">'.$match[3].'</a>';
        },

        // 2. Handle hashtags
        preg_replace_callback("/#(\w+)/", function($match) {
            return '<a href="http://facebook.com/hashtag/'.$match[1].'">'.$match[0].'</a>';
        },

        // 3. Handle breaklines
        str_replace("\n", "<br />", $description)));
}