Excerpt-Limit in wordpress

Excerpt-Limit:


    function excerpt($num) {
        $limit = $num + 1;
        $excerpt = explode(' ', get_the_excerpt(), $limit);
        array_pop($excerpt);
        $excerpt = implode(" ", $excerpt) . "... <a href='" . get_permalink($post->ID) . " '>Read more</a>";
        echo $excerpt;
    }

Use:

excerpt('30');