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Add a $taxonomy argument to each of the adjacent post functions. 

Each took an array of category (IDs) when to search. Those can now be term IDs and each function now has $taxonomy = 'category' as an optional argument.

Functions affected: get_previous_post(), get_next_post(), get_adjacent_post(), get_adjacent_post_rel_link(), adjacent_posts_rel_link(), next_post_rel_link(), prev_post_rel_link(), get_boundary_post(), get_previous_post_link(), previous_post_link(), get_next_post_link(), next_post_link(), get_adjacent_post_link(), adjacent_post_link().

props ethitter.
finally fixes #17807.

Built from https://develop.svn.wordpress.org/trunk@25959


git-svn-id: http://core.svn.wordpress.org/trunk@25918 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Andrew Nacin 2013-10-27 21:40:09 +00:00
parent a8ef13972c
commit 26d4fdf58d
1 changed files with 159 additions and 132 deletions
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247
wp-includes/link-template.php
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@ -1091,12 +1091,13 @@ function get_edit_user_link( $user_id = null ) {
*
* @since 1.5.0
*
* @param bool $in_same_cat Optional. Whether post should be in a same category.
* @param array|string $excluded_categories Optional. Array or comma-separated list of excluded category IDs.
* @param bool $in_same_term Optional. Whether post should be in a same taxonomy term.
* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
* @return mixed Post object if successful. Null if global $post is not set. Empty string if no corresponding post exists.
*/
function get_previous_post($in_same_cat = false, $excluded_categories = '') {
return get_adjacent_post($in_same_cat, $excluded_categories);
function get_previous_post( $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
return get_adjacent_post( $in_same_term, $excluded_terms, true, $taxonomy );
}
/**
@ -1104,12 +1105,13 @@ function get_previous_post($in_same_cat = false, $excluded_categories = '') {
*
* @since 1.5.0
*
* @param bool $in_same_cat Optional. Whether post should be in a same category.
* @param array|string $excluded_categories Optional. Array or comma-separated list of excluded category IDs.
* @param bool $in_same_term Optional. Whether post should be in a same taxonomy term.
* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
* @return mixed Post object if successful. Null if global $post is not set. Empty string if no corresponding post exists.
*/
function get_next_post($in_same_cat = false, $excluded_categories = '') {
return get_adjacent_post($in_same_cat, $excluded_categories, false);
function get_next_post( $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
return get_adjacent_post( $in_same_term, $excluded_terms, false, $taxonomy );
}
/**
@ -1119,54 +1121,55 @@ function get_next_post($in_same_cat = false, $excluded_categories = '') {
*
* @since 2.5.0
*
* @param bool $in_same_cat Optional. Whether post should be in a same category.
* @param array|string $excluded_categories Optional. Array or comma-separated list of excluded category IDs.
* @param bool $in_same_term Optional. Whether post should be in a same taxonomy term.
* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
* @param bool $previous Optional. Whether to retrieve previous post.
* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
* @return mixed Post object if successful. Null if global $post is not set. Empty string if no corresponding post exists.
*/
function get_adjacent_post( $in_same_cat = false, $excluded_categories = '', $previous = true ) {
function get_adjacent_post( $in_same_term = false, $excluded_terms = '', $previous = true, $taxonomy = 'category' ) {
global $wpdb;
if ( ! $post = get_post() )
if ( ( ! $post = get_post() ) || ! taxonomy_exists( $taxonomy ) )
return null;
$current_post_date = $post->post_date;
$join = '';
$posts_in_ex_cats_sql = '';
if ( $in_same_cat || ! empty( $excluded_categories ) ) {
$posts_in_ex_terms_sql = '';
if ( $in_same_term || ! empty( $excluded_terms ) ) {
$join = " INNER JOIN $wpdb->term_relationships AS tr ON p.ID = tr.object_id INNER JOIN $wpdb->term_taxonomy tt ON tr.term_taxonomy_id = tt.term_taxonomy_id";
if ( $in_same_cat ) {
if ( ! is_object_in_taxonomy( $post->post_type, 'category' ) )
if ( $in_same_term ) {
if ( ! is_object_in_taxonomy( $post->post_type, $taxonomy ) )
return '';
$cat_array = wp_get_object_terms($post->ID, 'category', array('fields' => 'ids'));
if ( ! $cat_array || is_wp_error( $cat_array ) )
$term_array = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'ids' ) );
if ( ! $term_array || is_wp_error( $term_array ) )
return '';
$join .= " AND tt.taxonomy = 'category' AND tt.term_id IN (" . implode(',', $cat_array) . ")";
$join .= $wpdb->prepare( " AND tt.taxonomy = %s AND tt.term_id IN (" . implode( ',', array_map( 'intval', $term_array ) ) . ")", $taxonomy );
}
$posts_in_ex_cats_sql = "AND tt.taxonomy = 'category'";
if ( ! empty( $excluded_categories ) ) {
if ( ! is_array( $excluded_categories ) ) {
// back-compat, $excluded_categories used to be IDs separated by " and "
if ( strpos( $excluded_categories, ' and ' ) !== false ) {
_deprecated_argument( __FUNCTION__, '3.3', sprintf( __( 'Use commas instead of %s to separate excluded categories.' ), "'and'" ) );
$excluded_categories = explode( ' and ', $excluded_categories );
$posts_in_ex_terms_sql = $wpdb->prepare( "AND tt.taxonomy = %s", $taxonomy );
if ( ! empty( $excluded_terms ) ) {
if ( ! is_array( $excluded_terms ) ) {
// back-compat, $excluded_terms used to be $excluded_terms with IDs separated by " and "
if ( false !== strpos( $excluded_terms, ' and ' ) ) {
_deprecated_argument( __FUNCTION__, '3.3', sprintf( __( 'Use commas instead of %s to separate excluded terms.' ), "'and'" ) );
$excluded_terms = explode( ' and ', $excluded_terms );
} else {
$excluded_categories = explode( ',', $excluded_categories );
$excluded_terms = explode( ',', $excluded_terms );
}
}
$excluded_categories = array_map( 'intval', $excluded_categories );
$excluded_terms = array_map( 'intval', $excluded_terms );
if ( ! empty( $cat_array ) ) {
$excluded_categories = array_diff($excluded_categories, $cat_array);
$posts_in_ex_cats_sql = '';
if ( ! empty( $term_array ) ) {
$excluded_terms = array_diff( $excluded_terms, $term_array );
$posts_in_ex_terms_sql = '';
}
if ( !empty($excluded_categories) ) {
$posts_in_ex_cats_sql = " AND tt.taxonomy = 'category' AND tt.term_id NOT IN (" . implode($excluded_categories, ',') . ')';
if ( ! empty( $excluded_terms ) ) {
$posts_in_ex_terms_sql = $wpdb->prepare( " AND tt.taxonomy = %s AND tt.term_id NOT IN (" . implode( $excluded_terms, ',' ) . ')', $taxonomy );
}
}
}
@ -1175,13 +1178,13 @@ function get_adjacent_post( $in_same_cat = false, $excluded_categories = '', $pr
$op = $previous ? '<' : '>';
$order = $previous ? 'DESC' : 'ASC';
$join = apply_filters( "get_{$adjacent}_post_join", $join, $in_same_cat, $excluded_categories );
$where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare("WHERE p.post_date $op %s AND p.post_type = %s AND p.post_status = 'publish' $posts_in_ex_cats_sql", $current_post_date, $post->post_type), $in_same_cat, $excluded_categories );
$join = apply_filters( "get_{$adjacent}_post_join", $join, $in_same_term, $excluded_terms );
$where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare( "WHERE p.post_date $op %s AND p.post_type = %s AND p.post_status = 'publish' $posts_in_ex_terms_sql", $current_post_date, $post->post_type), $in_same_term, $excluded_terms );
$sort = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1" );
$query = "SELECT p.ID FROM $wpdb->posts AS p $join $where $sort";
$query_key = 'adjacent_post_' . md5($query);
$result = wp_cache_get($query_key, 'counts');
$query_key = 'adjacent_post_' . md5( $query );
$result = wp_cache_get( $query_key, 'counts' );
if ( false !== $result ) {
if ( $result )
$result = get_post( $result );
@ -1192,7 +1195,7 @@ function get_adjacent_post( $in_same_cat = false, $excluded_categories = '', $pr
if ( null === $result )
$result = '';
wp_cache_set($query_key, $result, 'counts');
wp_cache_set( $query_key, $result, 'counts' );
if ( $result )
$result = get_post( $result );
@ -1208,33 +1211,34 @@ function get_adjacent_post( $in_same_cat = false, $excluded_categories = '', $pr
* @since 2.8.0
*
* @param string $title Optional. Link title format.
* @param bool $in_same_cat Optional. Whether link should be in a same category.
* @param array|string $excluded_categories Optional. Array or comma-separated list of excluded category IDs.
* @param bool $previous Optional, default is true. Whether to display link to previous or next post.
* @param bool $in_same_term Optional. Whether link should be in a same taxonomy term.
* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
* @param bool $previous Optional. Whether to display link to previous or next post. Default true.
* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
* @return string
*/
function get_adjacent_post_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '', $previous = true) {
function get_adjacent_post_rel_link( $title = '%title', $in_same_term = false, $excluded_terms = '', $previous = true, $taxonomy = 'category' ) {
if ( $previous && is_attachment() && $post = get_post() )
$post = get_post( $post->post_parent );
else
$post = get_adjacent_post( $in_same_cat, $excluded_categories, $previous );
$post = get_adjacent_post( $in_same_term, $excluded_terms, $previous, $taxonomy );
if ( empty($post) )
if ( empty( $post ) )
return;
$post_title = the_title_attribute( array( 'echo' => false, 'post' => $post ) );
if ( empty( $post_title ) )
$post_title = $previous ? __('Previous Post') : __('Next Post');
$post_title = $previous ? __( 'Previous Post' ) : __( 'Next Post' );
$date = mysql2date(get_option('date_format'), $post->post_date);
$date = mysql2date( get_option( 'date_format' ), $post->post_date );
$title = str_replace('%title', $post_title, $title);
$title = str_replace('%date', $date, $title);
$title = str_replace( '%title', $post_title, $title );
$title = str_replace( '%date', $date, $title );
$link = $previous ? "<link rel='prev' title='" : "<link rel='next' title='";
$link .= esc_attr( $title );
$link .= "' href='" . get_permalink($post) . "' />\n";
$link .= "' href='" . get_permalink( $post ) . "' />\n";
$adjacent = $previous ? 'previous' : 'next';
return apply_filters( "{$adjacent}_post_rel_link", $link );
@ -1246,12 +1250,13 @@ function get_adjacent_post_rel_link($title = '%title', $in_same_cat = false, $ex
* @since 2.8.0
*
* @param string $title Optional. Link title format.
* @param bool $in_same_cat Optional. Whether link should be in a same category.
* @param array|string $excluded_categories Optional. Array or comma-separated list of excluded category IDs.
* @param bool $in_same_term Optional. Whether link should be in a same taxonomy term.
* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
*/
function adjacent_posts_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '') {
echo get_adjacent_post_rel_link($title, $in_same_cat, $excluded_categories = '', true);
echo get_adjacent_post_rel_link($title, $in_same_cat, $excluded_categories = '', false);
function adjacent_posts_rel_link( $title = '%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
echo get_adjacent_post_rel_link( $title, $in_same_term, $excluded_terms = '', true, $taxonomy );
echo get_adjacent_post_rel_link( $title, $in_same_term, $excluded_terms = '', false, $taxonomy );
}
/**
@ -1273,11 +1278,12 @@ function adjacent_posts_rel_link_wp_head() {
* @since 2.8.0
*
* @param string $title Optional. Link title format.
* @param bool $in_same_cat Optional. Whether link should be in a same category.
* @param array|string $excluded_categories Optional. Array or comma-separated list of excluded category IDs.
* @param bool $in_same_term Optional. Whether link should be in a same taxonomy term.
* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
*/
function next_post_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '') {
echo get_adjacent_post_rel_link($title, $in_same_cat, $excluded_categories = '', false);
function next_post_rel_link( $title = '%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
echo get_adjacent_post_rel_link( $title, $in_same_term, $excluded_terms = '', false, $taxonomy );
}
/**
@ -1286,55 +1292,70 @@ function next_post_rel_link($title = '%title', $in_same_cat = false, $excluded_c
* @since 2.8.0
*
* @param string $title Optional. Link title format.
* @param bool $in_same_cat Optional. Whether link should be in a same category.
* @param array|string $excluded_categories Optional. Array or comma-separated list of excluded category IDs.
* @param bool $in_same_term Optional. Whether link should be in a same taxonomy term.
* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs. Default true.
* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
*/
function prev_post_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '') {
echo get_adjacent_post_rel_link($title, $in_same_cat, $excluded_categories = '', true);
function prev_post_rel_link( $title = '%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
echo get_adjacent_post_rel_link( $title, $in_same_term, $excluded_terms = '', true, $taxonomy );
}
/**
* Retrieve boundary post.
*
* Boundary being either the first or last post by publish date within the constraints specified
* by $in_same_cat or $excluded_categories.
* by $in_same_term or $excluded_terms.
*
* @since 2.8.0
*
* @param bool $in_same_cat Optional. Whether returned post should be in a same category.
* @param array|string $excluded_categories Optional. Array or comma-separated list of excluded category IDs.
* @param bool $in_same_term Optional. Whether returned post should be in a same taxonomy term.
* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
* @param bool $start Optional. Whether to retrieve first or last post.
* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
* @return object
*/
function get_boundary_post( $in_same_cat = false, $excluded_categories = '', $start = true ) {
function get_boundary_post( $in_same_term = false, $excluded_terms = '', $start = true, $taxonomy = 'category' ) {
$post = get_post();
if ( ! $post || ! is_single() || is_attachment() )
if ( ! $post || ! is_single() || is_attachment() || ! taxonomy_exists( $taxonomy ) )
return null;
$cat_array = array();
if( ! is_array( $excluded_categories ) )
$excluded_categories = explode( ',', $excluded_categories );
$query_args = array(
'posts_per_page' => 1,
'order' => $start ? 'ASC' : 'DESC',
'update_post_term_cache' => false,
'update_post_meta_cache' => false
);
if ( $in_same_cat || ! empty( $excluded_categories ) ) {
if ( $in_same_cat )
$cat_array = wp_get_object_terms( $post->ID, 'category', array( 'fields' => 'ids' ) );
$term_array = array();
if ( ! empty( $excluded_categories ) ) {
$excluded_categories = array_map( 'intval', $excluded_categories );
$excluded_categories = array_diff( $excluded_categories, $cat_array );
$inverse_cats = array();
foreach ( $excluded_categories as $excluded_category )
$inverse_cats[] = $excluded_category * -1;
$excluded_categories = $inverse_cats;
}
if ( ! is_array( $excluded_terms ) ) {
if ( ! empty( $excluded_terms ) )
$excluded_terms = explode( ',', $excluded_terms );
else
$excluded_terms = array();
}
$categories = implode( ',', array_merge( $cat_array, $excluded_categories ) );
if ( $in_same_term || ! empty( $excluded_terms ) ) {
if ( $in_same_term )
$term_array = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'ids' ) );
$order = $start ? 'ASC' : 'DESC';
if ( ! empty( $excluded_terms ) ) {
$excluded_terms = array_map( 'intval', $excluded_terms );
$excluded_terms = array_diff( $excluded_terms, $term_array );
return get_posts( array('numberposts' => 1, 'category' => $categories, 'order' => $order, 'update_post_term_cache' => false, 'update_post_meta_cache' => false) );
$inverse_terms = array();
foreach ( $excluded_terms as $excluded_term )
$inverse_terms[] = $excluded_term * -1;
$excluded_terms = $inverse_terms;
}
$query_args[ 'tax_query' ] = array( array(
'taxonomy' => $taxonomy,
'terms' => array_merge( $term_array, $excluded_terms )
) );
}
return get_posts( $query_args );
}
/*
@ -1344,12 +1365,13 @@ function get_boundary_post( $in_same_cat = false, $excluded_categories = '', $st
*
* @param string $format Optional. Link anchor format.
* @param string $link Optional. Link permalink format.
* @param bool $in_same_cat Optional. Whether link should be in same category.
* @param string $excluded_categories Optional. Excluded categories IDs.
* @param bool $in_same_term Optional. Whether link should be in a same taxonomy term.
* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
* @return string
*/
function get_previous_post_link( $format = '&laquo; %link', $link = '%title', $in_same_cat = false, $excluded_categories = '' ) {
return get_adjacent_post_link( $format, $link, $in_same_cat, $excluded_categories, true );
function get_previous_post_link( $format = '&laquo; %link', $link = '%title', $in_same_cat = false, $excluded_terms = '', $taxonomy = 'category' ) {
return get_adjacent_post_link( $format, $link, $in_same_cat, $excluded_terms, true, $taxonomy );
}
/**
@ -1360,11 +1382,12 @@ function get_previous_post_link( $format = '&laquo; %link', $link = '%title', $i
*
* @param string $format Optional. Link anchor format.
* @param string $link Optional. Link permalink format.
* @param bool $in_same_cat Optional. Whether link should be in a same category.
* @param array|string $excluded_categories Optional. Array or comma-separated list of excluded category IDs.
* @param bool $in_same_term Optional. Whether link should be in a same taxonomy term.
* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
*/
function previous_post_link( $format = '&laquo; %link', $link = '%title', $in_same_cat = false, $excluded_categories = '' ) {
echo get_previous_post_link( $format, $link, $in_same_cat, $excluded_categories );
function previous_post_link( $format = '&laquo; %link', $link = '%title', $in_same_cat = false, $excluded_terms = '', $taxonomy = 'category' ) {
echo get_previous_post_link( $format, $link, $in_same_cat, $excluded_terms, $taxonomy );
}
/**
@ -1375,12 +1398,13 @@ function previous_post_link( $format = '&laquo; %link', $link = '%title', $in_sa
*
* @param string $format Optional. Link anchor format.
* @param string $link Optional. Link permalink format.
* @param bool $in_same_cat Optional. Whether link should be in same category.
* @param string $excluded_categories Optional. Excluded categories IDs.
* @param bool $in_same_term Optional. Whether link should be in a same taxonomy term.
* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
* @return string
*/
function get_next_post_link( $format = '&laquo; %link', $link = '%title', $in_same_cat = false, $excluded_categories = '' ) {
return get_adjacent_post_link( $format, $link, $in_same_cat, $excluded_categories, false );
function get_next_post_link( $format = '&laquo; %link', $link = '%title', $in_same_cat = false, $excluded_terms = '', $taxonomy = 'category' ) {
return get_adjacent_post_link( $format, $link, $in_same_cat, $excluded_terms, false, $taxonomy );
}
/**
@ -1390,11 +1414,12 @@ function get_next_post_link( $format = '&laquo; %link', $link = '%title', $in_sa
*
* @param string $format Optional. Link anchor format.
* @param string $link Optional. Link permalink format.
* @param bool $in_same_cat Optional. Whether link should be in a same category.
* @param array|string $excluded_categories Optional. Array or comma-separated list of excluded category IDs.
* @param bool $in_same_term Optional. Whether link should be in a same taxonomy term.
* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
*/
function next_post_link( $format = '%link &raquo;', $link = '%title', $in_same_cat = false, $excluded_categories = '' ) {
echo get_next_post_link( $format, $link, $in_same_cat, $excluded_categories );
function next_post_link( $format = '%link &raquo;', $link = '%title', $in_same_cat = false, $excluded_terms = '', $taxonomy = 'category' ) {
echo get_next_post_link( $format, $link, $in_same_cat, $excluded_terms, $taxonomy );
}
/**
@ -1406,16 +1431,17 @@ function next_post_link( $format = '%link &raquo;', $link = '%title', $in_same_c
*
* @param string $format Link anchor format.
* @param string $link Link permalink format.
* @param bool $in_same_cat Optional. Whether link should be in a same category.
* @param array|string $excluded_categories Optional. Array or comma-separated list of excluded category IDs.
* @param bool $previous Optional, default is true. Whether to display link to previous or next post.
* @param bool $in_same_term Optional. Whether link should be in a same taxonomy term.
* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded terms IDs.
* @param bool $previous Optional. Whether to display link to previous or next post. Default true.
* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
* @return string
*/
function get_adjacent_post_link( $format, $link, $in_same_cat = false, $excluded_categories = '', $previous = true ) {
function get_adjacent_post_link( $format, $link, $in_same_cat = false, $excluded_terms = '', $previous = true, $taxonomy = 'category' ) {
if ( $previous && is_attachment() )
$post = get_post( get_post()->post_parent );
else
$post = get_adjacent_post( $in_same_cat, $excluded_categories, $previous );
$post = get_adjacent_post( $in_same_cat, $excluded_terms, $previous, $taxonomy );
if ( ! $post ) {
$output = '';
@ -1454,12 +1480,13 @@ function get_adjacent_post_link( $format, $link, $in_same_cat = false, $excluded
* @param string $format Link anchor format.
* @param string $link Link permalink format.
* @param bool $in_same_cat Optional. Whether link should be in a same category.
* @param array|string $excluded_categories Optional. Array or comma-separated list of excluded category IDs.
* @param bool $previous Optional, default is true. Whether to display link to previous or next post.
* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded category IDs.
* @param bool $previous Optional. Whether to display link to previous or next post. Default true.
* @param string $taxonomy Optional. Taxonomy, if $in_same_term is true. Default 'category'.
* @return string
*/
function adjacent_post_link( $format, $link, $in_same_cat = false, $excluded_categories = '', $previous = true ) {
echo get_adjacent_post_link( $format, $link, $in_same_cat, $excluded_categories, $previous );
function adjacent_post_link( $format, $link, $in_same_cat = false, $excluded_terms = '', $previous = true, $taxonomy = 'category' ) {
echo get_adjacent_post_link( $format, $link, $in_same_cat, $excluded_terms, $previous, $taxonomy );
}
/**