WP Custom Excerpt

wp-custom-excerpt.php

<?php
// You can add this in your function.php file to modify the Wordpress Excerpt
if ( !function_exists( 'theme_excerpt_length' ) ) :
    function theme_excerpt_length( $length ) {
        return 40;
    }
endif;

if ( !function_exists( 'theme_excerpt_more' ) ) : 
    function theme_excerpt_more( $more ) {
        return '...';
    }
endif;