Custom Post Navigation for Bootstrap Theme

    /*
     * Custom Post Navigation for Bootstrap Theme
     *
     *  This function is replacement for:
     *  @the_post_navigation();
     *  and is used on single.php template, line: 61
     *
     *  It shows nice and clear post navigation tailored to Bootstrap Theme
     *
     * @since The Bootstrap Blog 0.1
     **/

function the_bootstrap_blog__the_post_navigation(){

    $n = "\n";

    $prev = get_adjacent_post( false, '', true );

    if( !empty( $prev ) )
        $prev = '<a class="btn btn-outline-primary" href="' . esc_url( get_permalink( $prev->ID ) ) . '" title="' . esc_attr( $prev->post_title ) . '">' . __( 'Previus post', 'the-bootstrap-blog') . '</a>';

    $next = get_adjacent_post( false, '', false );

    if( !empty( $next ) )
        $next = '<a class="btn btn-outline-secondary" href="' . esc_url( get_permalink( $next->ID ) ) . '" title="' . esc_attr( $next->post_title ) . '">' . __( 'Next post', 'the-bootstrap-blog') . '</a>';

    $post_pagination = "<nav class='blog-pagination mb-4'>{$n}{$prev}{$n}{$next}{$n}</nav>";

    echo $post_pagination;
}