Pierwotnym zamiarem tego pytania było wiedzieć, skąd skierowano pojedynczy post, a następnie zgodnie z tym, obsłużyć kolejne i poprzednie posty zgodnie z polecającym post.
Chciałem na przykład:
Kliknięcie posta następuje na stronie kategorii, taksonomii, tagu, wyszukiwania lub archiwum autora. Te archiwa służą jako strony odsyłające. Teraz normalnie można by użyć, tak jak w moim pytaniu, wp_get_referer()aby uzyskać odnośnika i użyć go w dalszych zapytaniach. Jak opisano przez @GM w jego zaakceptowanej odpowiedzi powyżej , ta metoda nie jest niezawodna, więc skorzystałem z jego alternatywnego rozwiązania .
Innym problemem było użycie jakiegoś pliku cookie lub sesji do przechowywania tego odsyłacza, aby nadal wyświetlać posty od oryginalnego odsyłacza, gdy odsuwasz się od oryginalnego pojedynczego wpisu, który został kliknięty w określonym archiwum. Ponieważ pliki cookie są również kontrolowane przez użytkownika końcowego, a zatem nie są wiarygodne, a fakt, że WordPress domyślnie nie używa sesji, zmieniłem linki do następnego i poprzedniego postu za pomocą @GM Alternative Solution, aby mieć niezawodny sposób sprawdzania i przechowywania mojej oryginalnej polecający.
Właśnie to wymyśliłem i mam nadzieję, że ktoś okaże się przydatny w najbliższej przyszłości. Używaj i nadużywaj kodu, aby dopasować go do swoich potrzeb, tylko jedna prośba: zostaw link z powrotem do tego pytania. :-)
UWAGI DOTYCZĄCE KODU OBSERWUJĄCEGO
Ten kod jest dość długi i intensywny, więc nie będę wchodził w szczegóły. Kod został dobrze skomentowany
Ten kod ma opcję stronicowania między postami w tym samym terminie, podobnie jak domyślny next_post_link()i previous_post_link()działa w WordPress. Podobnie jak funkcje natywne, musisz ustawić taksonomię. Domyślna wartość in_same_termto, truea taksonomia tocategory
Co najważniejsze, ten kod wymaga PHP 5.4+
KOD
<?php
/**
* @author Pieter Goosen
* @license GPLv2
* @link http://www.gnu.org/licenses/gpl-2.0.html
*
* The functions on this page returns the next and previous post links
* depending on what has been set
*
* @return function single_post_navigation()
*/
/**
* Register six new query variables aq, ,cq, tq, ttq, taq, and sq set by
* the term_referer_link function
*
* @see http://codex.wordpress.org/WordPress_Query_Vars
*
*/
add_filter( 'query_vars', function ( $vars ) {
$vars[] = 'cq'; // Will hold category ID
$vars[] = 'tq'; // Will hold taxonomy name
$vars[] = 'ttq'; // Will hold term slug
$vars[] = 'sq'; // Will hold search query
$vars[] = 'aq'; // Will hold author name
$vars[] = 'taq'; // Will hold tag id
return $vars;
}, 10, 3 );
/**
* Conditional tag to check whether or not a query_var has been set
*
* @param string $query_var query_var to check
* @return (bool) true if query_var exists, false on failure
*
*/
function has_query_var( $query_var ) {
$array = $GLOBALS['wp_query']->query_vars;
return array_key_exists( $query_var, $array );
}
/**
* For posts being clicked from a category page, the query_var, 'cq' is set.
* 'cq' holds the category ID
*
* Set two query_var, 'tq' and 'ttq' to single posts that was clicked on from
* taxonomy pages. 'tq' holds the taxonomy name while 'ttq' holds the term name
*
* For search queries, the query_var, 'sq' is set to single posts that was clicked on from
* the search page. 'sq' holds the search query value
*
* For posts being clicked from an author page, the query_var, 'aq' is set.
* 'aq' holds the author ID
*
* For posts being clicked from a tag page, the query_var, 'taq' is set.
* 'taq' holds the tag ID
*
* This function replaces the wp_get_referer() and $_SERVER['HTTP_REFERER']
* functions that are not very reliable
* @see php.net manual $_SERVER['HTTP_REFERER']
* @link http://php.net/manual/en/reserved.variables.server.php
*
* @uses add_query_arg()
* @uses post_link
* @uses post_type_link
*
*/
add_filter( 'post_type_link', 'term_referer_link', 10, 3 );
add_filter( 'post_link', 'term_referer_link', 10, 3 );
function term_referer_link( $permalink, $post ) {
switch ( true ) {
case ( is_category() ):
$category = get_queried_object_id();
$args = [
'cq' => $category,
];
break;
case ( is_tax() ):
$term = get_queried_object();
$args = [
'tq' => $term->taxonomy,
'ttq' => $term->slug
];
break;
case ( is_search() ):
$search = get_search_query();
$args = [
'sq' => $search,
];
break;
case ( is_author() ):
$author = get_queried_object_id();
$args = [
'aq' => $author,
];
break;
case ( is_tag() ):
$tag = get_queried_object_id();
$args = [
'taq' => $tag,
];
break;
}
if( isset( $args ) ) {
$permalink = add_query_arg( $args, $permalink );
}
return $permalink;
}
/**
* @access private
* This function is marked private and should not be used in any other functions
*
* This is a helper function for the main navigation function
*
* This function checks if any of the query variables is set in the single
* post page URL. If they exist, the values are retrieved that were set
* by the query variables
*
* These query variables are converted into query arguments for the query that will
* be used to determine the current post position and the posts adjacent to the
* current post which will translate in the next and previous post.
*
* When no query variables are present, an empty array of arguments is returned
*
* @uses has_query_var()
* @return (array) $add_query_args_to_args Query variable to determine the next/previous post links
* @see http://codex.wordpress.org/Function_Reference/add_query_arg
*
*/
function _query_vars_to_query_args() {
switch ( true ) {
case ( has_query_var( 'cq' ) ): // For category referrer
$category = get_query_var( 'cq' );
$add_query_args_to_args = [
'cat' => $category,
];
break;
case ( has_query_var( 'tq' ) && has_query_var( 'ttq' ) ): // For taxonomy term referrer
$taxonomy = get_query_var( 'tq' );
$term = get_query_var( 'ttq' );
$add_query_args_to_args = [
'tax_query' => [
[
'taxonomy' => $taxonomy,
'field' => 'slug',
'terms' => $term,
'include_children' => false,
],
],
];
break;
case ( has_query_var( 'sq' ) ): // For search referrer
$search = get_query_var( 'sq' );
$add_query_args_to_args = [
's' => $search,
];
break;
case ( has_query_var( 'aq' ) ): // For author referrer
$author = get_query_var( 'aq' );
$add_query_args_to_args = [
'author' => $author,
];
break;
case ( has_query_var( 'taq' ) ): // For tag referrer
$tag = get_query_var( 'taq' );
$add_query_args_to_args = [
'tag_id' => $tag,
];
break;
default: // Default: returns empty array on any other archive or homepage
$add_query_args_to_args = [];
break;
}
return $add_query_args_to_args;
}
/**
* @access private
* This function is marked private and should not be used in any other functions
*
* This is a helper function for the main pagination function. This function
* checks if the defined query variables has been set in the URL of a single
* post
*
* If any of the query variables are found on any given single post page, then
* these query variables will be set to the next and previous post links according
* to the single post's query variables
*
* This way, next and previous posts will be shown from the same category, term,
* search query or author archive from which the original single post was referred
* from.
*
* If a single post was referred from any other archive or main page, these query
* variables will not be set, and function will default to an empty array and no
* query variables will be set to the next and previous post links
*
* @uses has_query_var()
* @return (array) $qv Query variable to add to next/previous post links
* @see http://codex.wordpress.org/Function_Reference/add_query_arg
*
* @todo Other archives can be added later
*/
function _add_query_vars_to_nav_links() {
switch ( true ) {
case ( has_query_var( 'cq' ) ): // For category referrer
$category = get_query_var( 'cq' );
$qv = [
'cq' => $category,
];
break;
case ( has_query_var( 'tq' ) && has_query_var( 'ttq' ) ): // For taxonomy term referrer
$taxonomy = get_query_var( 'tq' );
$term = get_query_var( 'ttq' );
$qv = [
'tq' => $term->taxonomy,
'ttq' => $term->slug
];
break;
case ( has_query_var( 'sq' ) ): // For search referrer
$search = get_query_var( 'sq' );
$qv = [
'sq' => $search,
];
break;
case ( has_query_var( 'aq' ) ): // For author referrer
$author = get_query_var( 'aq' );
$qv = [
'aq' => $author,
];
break;
case ( has_query_var( 'taq' ) ): // For tag referrer
$tag = get_query_var( 'taq' );
$qv = [
'taq' => $tag,
];
break;
default: // Default: returns empty array on any other archive or homepage
$qv = [];
break;
}
return $qv;
}
/**
* This function returns navigation links to the next/previous single post
* There are choices to which taxonomy to use, and whether adjacent posts should
* be of the same term or not
*
* When in_same_term is set to true, you have a choice to use the parent term or
* child term if a post belongs to both. If the parent term is not available, the child term
* is automatically used
*
* @param array $defaults An array of key => value arguments. Defaults below
* - bool in_same_term Whether or not next/previous post should be in the same term Default true
* - bool parent_term If in_same_term is true, should the parent or child terms be used Default true
* - string/array taxonomy The taxonomy from which terms to use Default category
* - string/array post_types Post types to get posts from. Uses current post's post type on empty string. Default empty string
* - string previous_text Text to display with previous post Default 'Previous post'
* - string next_text Text to display with next post Default 'Next post'
*
* @return string $links
*/
function get_single_post_navigation( $args = [] ) {
// Sets the default arguments for default usage
$defaults = [
'in_same_term' => true,
'parent_term' => true,
'post_types' => '',
'taxonomy' => 'category',
'previous_text' => __( 'Previous post' ),
'next_text' => __( 'Next post' ),
];
// Merges the default arguments with user defined variables
$args = wp_parse_args( $args, $defaults );
/**
* Get the currently displayed single post. For this use
* get_queried_object() as this is more safe than the global $post
*
* The $post global is very easily changed by any poorly written custom query
* or function, and is there for not reliable
*
* @see Post below on WPSE for explanation
* @link /wordpress//q/167706/31545
*/
$single_post = get_queried_object();
/**
* Use the post type of the current post or post types entered in args
*
*/
$post_type = ( empty( $args['post_types'] ) ) ? $single_post->post_type : $args['post_types'];
// Set the variable query variables according to condition
if( !empty( _query_vars_to_query_args() ) ) {
$query_args = _query_vars_to_query_args();
}elseif( true === $args['in_same_term'] ) {
$terms = wp_get_post_terms( $single_post->ID, $args['taxonomy'] );
if ( ! empty( $terms ) && ! is_wp_error( $terms ) ){
foreach ( $terms as $term ) {
if( $term->parent === 0 ) {
$parent[] = $term;
}else{
$child[] = $term;
}
}
$term_id = ( $args['parent_term'] === true && isset( $parent ) ) ? $parent[0]->term_id : $child[0]->term_id;
$query_args = [
'tax_query' => [
[
'taxonomy' => $args['taxonomy'],
'field' => 'term_id',
'terms' => $term_id,
'include_children' => false,
],
],
];
}
}else{
$query_args = [];
}
// Default arguments to use with all the conditional statements above
$default_query_args = [
'post_type' => $post_type,
'fields' => 'ids',
'posts_per_page' => -1,
'suppress_filters' => true,
];
// Merges the default arguments with the arguments from the conditional statement
$combined_args = wp_parse_args( $query_args, $default_query_args );
$q = new WP_Query( $combined_args );
// Get the current post position. Will be used to determine adjacent posts
$current_post_position = array_search( $single_post->ID, $q->posts );
// Get the returned values from '_add_query_vars_to_nav_links()' to build links
$get_qv = _add_query_vars_to_nav_links();
// Get the next/older post ID
if ( array_key_exists( $current_post_position + 1 , $q->posts ) ) {
$next = $q->posts[$current_post_position + 1];
}
// Get post title link to the next post
if( isset( $next ) ) {
$next_post = get_post( $next );
$next_post_link = ( !empty( $get_qv ) ) ? add_query_arg( $get_qv, get_permalink( $next ) ) : get_permalink( $next );
$next_title = '<span class="meta-nav">' . $args['next_text'] . ': </span><a href="' . $next_post_link . '">' . $next_post->post_title . '</a></br>';
}else{
$next_title = '';
}
// Get the previous/newer post ID
if ( array_key_exists( $current_post_position - 1 , $q->posts ) ) {
$previous = $q->posts[$current_post_position - 1];
}
// Get post title link to the previous post
if( isset( $previous ) ) {
$previous_post = get_post( $previous );
$previous_post_link = ( !empty( $get_qv ) ) ? add_query_arg( $get_qv, get_permalink( $previous ) ) : get_permalink( $previous );
$previous_title = '<span class="meta-nav">' . $args['previous_text'] . ': </span><a href="' . $previous_post_link . '">' . $previous_post->post_title . '</a></br>';
}else{
$previous_title = '';
}
// Create the next/previous post links
$links = '<nav class="navigation post-navigation" role="navigation">';
$links .= '<div class="nav-links">';
$links .= $previous_title;
$links .= $next_title;
$links .= '</div><!-- .nav-links -->';
$links .= '</nav><!-- .navigation -->';
// Returns the post links with HTML mark-up
return $links;
}
/**
* This function is simply just a wrapper for the main navigation
* function and echo's the returned values from the main navigation
* function
*/
function single_post_navigation( $args = [] ) {
echo get_single_post_navigation( $args );
}
WYKORZYSTANIE W JEDNYM SZABLONIE
Jeśli nie musisz poruszać się po postach w tym samym terminie, uzyskiwać posty ze wszystkich typów postów i dostosowywać następny i poprzedni tekst za pomocą linku, możesz wykonać następujące czynności:
$args = [
'in_same_term' => false,
'post_types' => ['post', 'my_post_type'],
'previous_text' => __( 'Vorige Pos' ),
'next_text' => __( 'Volgende Pos' ),
];
single_post_navigation( $args );
EDYCJA 1
Na żądanie od posta na SO oraz w ramach a @todo, wprowadziłem obsługę nie tylko nawigacji między postami z bieżącego typu posta, ale z tablicy typów postów ustawionych przez użytkownika za pomocąpost_types parametru w funkcji. Zobacz zaktualizowany kod.
EDYCJA 2
Dodaj 'suppress_filters' => true,do WP_Queryargumentów, aby podział na strony nie był zmieniany przez żadne filtry użyte w ciąguWP_Query