The page navigation of wordpress classification page is the previous page and the next page by default. Sometimes we want it to display the digital page. How do we operate it? Most of them think that it can be solved by installing a plug-in. As a developer who likes to research, they will naturally implement it in code. Let's take a look at it with ytkah.

Add the following code to the function.php file of the current topic

function wpbeginner_numeric_posts_nav() {
 
    if( is_singular() )
        return;
 
    global $wp_query;
 
    /** Stop execution if there's only 1 page */
    if( $wp_query->max_num_pages <= 1 )
        return;
 
    $paged = get_query_var( 'paged' ) ? absint( get_query_var( 'paged' ) ) : 1;
    $max   = intval( $wp_query->max_num_pages );
 
    /** Add current page to the array */
    if ( $paged >= 1 )
        $links[] = $paged;
 
    /** Add the pages around the current page to the array */
    if ( $paged >= 3 ) {
        $links[] = $paged - 1;
        $links[] = $paged - 2;
    }
 
    if ( ( $paged + 2 ) <= $max ) {
        $links[] = $paged + 2;
        $links[] = $paged + 1;
    }
 
    echo '<div class="navigation"><ul>' . "\n";
 
    /** Previous Post Link */
    if ( get_previous_posts_link() )
        printf( '<li>%s</li>' . "\n", get_previous_posts_link() );
 
    /** Link to first page, plus ellipses if necessary */
    if ( ! in_array( 1, $links ) ) {
        $class = 1 == $paged ? ' class="active"' : '';
 
        printf( '<li%s><a href="%s">%s</a></li>' . "\n", $class, esc_url( get_pagenum_link( 1 ) ), '1' );
 
        if ( ! in_array( 2, $links ) )
            echo '<li>...</li>';
    }
 
    /** Link to current page, plus 2 pages in either direction if necessary */
    sort( $links );
    foreach ( (array) $links as $link ) {
        $class = $paged == $link ? ' class="active"' : '';
        printf( '<li%s><a href="%s">%s</a></li>' . "\n", $class, esc_url( get_pagenum_link( $link ) ), $link );
    }
 
    /** Link to last page, plus ellipses if necessary */
    if ( ! in_array( $max, $links ) ) {
        if ( ! in_array( $max - 1, $links ) )
            echo '<li>...</li>' . "\n";
 
        $class = $paged == $max ? ' class="active"' : '';
        printf( '<li%s><a href="%s">%s</a></li>' . "\n", $class, esc_url( get_pagenum_link( $max ) ), $max );
    }
 
    /** Next Post Link */
    if ( get_next_posts_link() )
        printf( '<li>%s</li>' . "\n", get_next_posts_link() );
 
    echo '</ul></div>' . "\n";
 
}

Then add the following code to archive.php, category.php and other files to call

<?php wpbeginner_numeric_posts_nav(); ?>

Finally, define the css Style

.navigation li a,
.navigation li a:hover,
.navigation li.active a,
.navigation li.disabled {
    color: #fff;
    text-decoration:none;
}
 
.navigation li {
    display: inline;
}
 
.navigation li a,
.navigation li a:hover,
.navigation li.active a,
.navigation li.disabled {
    background-color: #6FB7E9;
    border-radius: 3px;
    cursor: pointer;
    padding: 12px;
    padding: 0.75rem;
}
 
.navigation li a:hover,
.navigation li.active a {
    background-color: #3C8DC5;
}

Reference from https://www.wpbeginner.com/wp-themes/how-to-add-numeric-pagination-in-your-wordpress-theme/