excerpts words-symbols

functions.php

function new_excerpt_length($length) { 
 return 10; 
} 
add_filter('excerpt_length', 'new_excerpt_length'); 

<?php the_excerpt('new_excerpt_length', 10); ?>

function trim_characters($count, $after = '...'){
  $excerpt = get_the_content();
  $excerpt = strip_tags($excerpt);
  $excerpt = mb_substr($excerpt, 0, $count);
  $excerpt = $excerpt . $after;
  return $excerpt;
}

<?php echo trim_characters(200, '...'); ?>