Display and Customizing a Read More link in WordPress Excerpts

WP Post Excerpt-01

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) ." ' class='".readmore."'>Read       More</a>";
  echo $excerpt;
}
Call Function: <?php echo excerpt('15'); ?>

WP Post Excerpt-02

functions.php
function new_excerpt_length($length) {
 return 100;
 }
 add_filter('excerpt_length', 'new_excerpt_length');

 function new_excerpt_more( $more ) {
  return ' Read More';
}
add_filter( 'excerpt_more', 'new_excerpt_more' );

Call function:
 the_excerpt() ;

WP Post Excerpt-03

functions.php
function the_content_limit($max_char, $more_link_text = '(more...)', $stripteaser = 0, $more_file = '') {
    $content = get_the_content($more_link_text, $stripteaser, $more_file);
    $content = apply_filters('the_content', $content);
    $content = str_replace(']]>', ']]&gt;', $content);

   if (strlen($_GET['p']) > 0) {
      echo $content;
   }

   else if ((strlen($content)>$max_char) && ($espacio = strpos($content, " ", $max_char ))) {
        $content = substr($content, 0, $espacio);
        $content = $content;
        echo $content;
        echo "&hellip;</p>";
        echo "<span class=\"readmore\"><a href=\"";
        the_permalink();
        echo "\">".$more_link_text."</a></span>";
   }
              else {
                     echo $content;
                    }
}
Call function:
<?php the_content_limit(400, "Read More") ?>

Excerpt Example

<?php get_header(); ?>
<div class="internal_page">
<div class="stracture">
<div class="content floatleft">
<div class="breadcumbs">
<?php if (function_exists('wordpress_breadcrumbs')) wordpress_breadcrumbs(); ?>
</div>
<?php if(have_posts()) : ?><?php while(have_posts())  : the_post(); ?>
<div class="post" id="post-<?php the_ID(); ?>">
<?php the_post_thumbnail('post-image', array('class' => 'imgthumb')); ?>
<div id="post-title" class="fix">
<h2><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></h2>
</div> <!-- end div .post-title -->

<div class="entry">

<?php the_excerpt(); ?> 

or 

<div class="blogexcerpt"><?php echo excerpt('58'); ?></div>

<div class="space">
<?php get_template_part( 'postmeta' ); // Post Meta (postmeta.php) ?>
</div>

<?php comments_template( '', true ); ?>
</div> <!-- end div .entry -->
</div> <!-- end div .post -->

<?php endwhile; ?>

<?php else : ?>
<div class="post">
<h3><?php _e('404 Error&#58; Not Found', 'imran_business'); ?></h3>
</div>
<?php endif; ?>

</div>

<?php get_sidebar(); ?>

</div>
</div>

<?php get_footer(); ?>