# Function to trim the excerpt

wordpress-trim-excerpt.php

# Function to trim the excerpt
if (!function_exists('narga_excerpts')) :  
    function narga_excerpts($content = false) {
        # If is the home page, an archive, or search results
        if(is_front_page() || is_archive() || is_search()) :
            global $post;
        $content = $post->post_excerpt;
        $content = strip_shortcodes($content);
        $content = str_replace(']]>', ']]>', $content);
        $content = strip_tags($content);
        # If an excerpt is set in the Optional Excerpt box
        if($content) :
            $content = apply_filters('the_excerpt', $content);
        # If no excerpt is set
        else :
            $content = $post->post_content;
        $excerpt_length = 50;
        $words = explode(' ', $content, $excerpt_length + 1);
        if(count($words) > $excerpt_length) :
            array_pop($words);
        array_push($words, '...<p><a class="more-link" href="' . get_permalink() . '" title="' . the_title_attribute('echo=0') . '">  ' . __( 'Read more &#187;', 'narga' ) . ' </a></p>');
        $content = implode(' ', $words);
endif;
$content = '<p>' . $content . '</p>';
endif;
endif;
# Make sure to return the content
return $content;
    }
# Replace content with excerpt
if (get_theme_mod('posts_excerpt') == 'enable') {
    add_filter('the_content', 'narga_excerpts');
}
endif;