Excerpt.php

<?php

function my_excerpt($excerpt, $maxLength = 200){
  $excerpt = preg_replace(" (\[.*?\])",'',$excerpt);
  $excerpt = strip_shortcodes($excerpt);
  $excerpt = strip_tags($excerpt);
  $fullLength = strlen($excerpt);
  $excerpt = substr($excerpt, 0, $maxLength);
  $excerpt = substr($excerpt, 0, strripos($excerpt, " "));
  $excerpt = trim(preg_replace( '/\s+/', ' ', $excerpt));
  if($fullLength > $maxLength) {
    $excerpt = $excerpt.'...';
  }
  return $excerpt;
}