wordpress - How to set get_the_excerpt() limit word in shordcode -

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i want limit words in shortcode. i'm trying made wp plugin here need limited words get_the_excerpt{(); functions.

php has many ways : place in functions.php: 

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;     }

then, in theme, use code <?php excerpt('22'); ?> limit excerpt 22 characters.

other way : <?php echo substr(get_the_excerpt(), 0,30); ?>

enjoy!!


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