Single Page View for Paginated Posts

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Yes, it is possible, and I use it on my own site. Here it is in action: my Settings API post is paginated, but can viewed on a single page, using the “Single-Page View” link.

First, you need to prepare a custom query variable, e.g. in functions.php, add the following:

function cbnet_parameter_queryvars( $qvars ) {
    $qvars[] = 'all';
    return $qvars;
}
add_filter( 'query_vars', 'cbnet_parameter_queryvars' );

Second, inside the Loop, you need to replace your basic call to the_content() with the following:

global $wp_query;
$no_pagination = false;
if ( isset( $wp_query->query_vars['all'] ) ) {
    $no_pagination = $wp_query->query_vars['all'];
}
if( $no_pagination ) {
    echo apply_filters( 'the_content', $post->post_content ); 
    $page=$numpages+1;
} else {
    the_content('Read the rest of this entry');
}

Then finally, you need to add a link to generate the single-page view, e.g. next to your “Permalink” and “Comments” links in your Post Meta:

<?php 
global $numpages;
if ( is_singular() && $numpages > 1 ) { ?>
        <strong>|</strong> <a href="https://wordpress.stackexchange.com/questions/32119/<?php echo add_query_arg( array("all' => '1'), get_permalink() ); ?>" title="single-page view">Single-Page View</a>
<?php } ?>

Now, when you clock the “Single-Page View” link, the entire post content will appear on a single page.

Note: h/t to this WPORG support forum topic

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