Rewrite the excerpt settings

// Rewrite the excerpt settings
function get_excerpt($text, $post_id) {
    $post_content = get_post($post_id);
    $text = $post_content->post_content;
    $text = apply_filters('the_content', $text);
    $text = str_replace('\]\]\>', ']]>', $text);
    $text = preg_replace('@<script[^>]*?>.*?</script>@si', '', $text);
    $text = strip_tags($text, '<p><a><img><ul><li><strong><br>');
    $excerpt_length = 50;
    $words = explode(' ', $text, $excerpt_length + 1);
    if (count($words)> $excerpt_length) {
            array_pop($words);
            array_push($words, '...');
            $text = implode(' ', $words);
            $text = force_balance_tags( $text );
    }

    return $text;
}
add_shortcode('full-post-excerpt', 'get_excerpt');