一般WordPress主题都会带有文章分页功能，但是很少有“阅读全文”的功能，如果分页少没有该功能是无所谓的，但是如果分页过多的话，为了提高用户体验，还是需要添加一个“阅读全文”的功能。那么WordPress如何实现添加分页及阅读全文功能？
复制下方代码到主题的 functions.php 文件里面：
function io_link_pages() {
global $wp_query, $numpages;
if(isset( $wp_query->query_vars[ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’view\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ ] ) && $wp_query->query_vars[ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’view\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ ] === \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’all\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’){
echo \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'<div class=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”page-nav text-center my-3\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”><a href=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ . get_permalink() . \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”><span class=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”all\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”>分页阅读</span></a></div>\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’;
} elseif ( 1 < $numpages ) {
wp_link_pages(array(\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’before\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ => \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'<div class=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”page-nav text-center my-3\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”>\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’after\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ => \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’next_or_number\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ => \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’next\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’previouspagelink\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ => \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'<span><i class=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”iconfont icon-arrow-l\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”></i></span>\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’nextpagelink\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ => \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”));
wp_link_pages(array(\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’before\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ => \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’after\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ => \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’next_or_number\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ => \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’number\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’link_before\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ =>\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'<span>\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’link_after\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’=>\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'</span>\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’));
wp_link_pages(array(\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’before\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ => \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’after\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ => \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’next_or_number\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ => \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’next\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’previouspagelink\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ => \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’nextpagelink\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ => \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ <span><i class=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”iconfont icon-arrow-r\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”></i></span>\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’));
echo \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ <a href=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ . get_pagenum_link( 1 ) . ( preg_match( \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’/\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\?/\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, get_pagenum_link( 1 ) ) ? \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’&\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ : \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’?\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ ) . \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’view=all\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ . \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”><span class=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”all\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\”>阅读全文</span></a></div>\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’;
}
}
add_filter( \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’query_vars\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’wp_link_pages_all_parameter_queryvars\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ );
add_action( \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’the_post\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’wp_link_pages_all_the_post\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ , 0 );
function wp_link_pages_all_parameter_queryvars( $queryvars ) {
$queryvars[] = \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’view\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’;
return( $queryvars );
}
function wp_link_pages_all_the_post( $post ) {
global $pages, $multipage, $wp_query;
if ( isset( $wp_query->query_vars[ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’view\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ ] ) && ( \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’all\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ === $wp_query->query_vars[ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’view\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ ] ) ) {
$multipage = true;
$post->post_content = str_replace( \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'<!–nextpage–>\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’, $post->post_content );
$pages = array( $post->post_content );
}
}
到文章模板 single.php 文件的the_content()下方添加下面的代码调用就可以了。
<?php io_link_pages() ?>