Wordpress Custom Excerpt function

custom_excerpt_wp.php

<?php
function get_excerpt($count, $post_id){
  $permalink = get_permalink($post_id);
  $excerpt = get_post($post_id);
  $excerpt = $excerpt->post_content;
  $excerpt = strip_tags($excerpt);
  $excerpt = substr($excerpt, 0, $count);
  $excerpt = substr($excerpt, 0, strripos($excerpt, " "));
  $excerpt = $excerpt;
  // Want a read more link and ellipsis, remove the line above this and replace it with the one below.
  $excerpt = $excerpt.'... <a href="'.$permalink.'">more</a>';
  return $excerpt;
}
?>

custom_excerpt_wp_usage.php

<?php
// When using loop first arg is no. of chars you want displayed second arg is passing the global post ID.
  echo get_excerpt(100, $post_id);
 
// When using in custom get_posts loop
  echo get_excerpt(100, $custom_foreach->ID); 
?>