WordPress uses the PHP explode function to split the content into a
array of ‘pages’. Happens in the setup_postdata function with this
code:$pages = explode(”, $content);
So you could do something like :
function wpse_103026( $content, $pagenum ) {
if ( strpos( $content, '<!--nextpage-->' ) ) {
$pages = explode('<!--nextpage-->', $content);
return isset ( $pages[$pagenum-1] ) ? trim( $pages[$pagenum-1] ) : $content;
} else {
return false;
}
}
And then you can retrieve content of page 4 with :
echo apply_filters( 'the_content', wpse_103026( $post->post_content, 4 ) );
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