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@kovshenin
Created November 9, 2011 15:13
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<?php
class Some_Plugin {
function previous_gallery_post_link() {
add_filter( 'posts_where', array( &$this, 'filter_where_date_lt' ) );
$previous = new WP_Query( array(
'post_type' => 'post',
'tax_query' => array(
'relation' => 'AND',
array(
'taxonomy' => 'post_format',
'field' => 'slug',
'terms' => array( 'post-format-gallery' )
)
),
'order' => 'DESC',
'posts_per_page' => 1
) );
// Clean filters
remove_filter( 'posts_where', array( &$this, 'filter_where_date_lt' ) );
if ( $previous->have_posts() ) {
$previous->the_post();
echo '<a class="previous" href="' . get_permalink() . '">Previous</a>';
}
wp_reset_postdata();
}
function next_gallery_post_link() {
add_filter( 'posts_where', array( &$this, 'filter_where_date_gt' ) );
$next = new WP_Query( array(
'post_type' => 'post',
'tax_query' => array(
'relation' => 'AND',
array(
'taxonomy' => 'post_format',
'field' => 'slug',
'terms' => array( 'post-format-gallery' )
)
),
'order' => 'ASC',
'posts_per_page' => 1
) );
// Clean filters
remove_filter( 'posts_where', array( &$this, 'filter_where_date_gt' ) );
if ( $next->have_posts() ) {
$next->the_post();
echo '<a class="next" href="' . get_permalink() . '">Previous</a>';
}
wp_reset_postdata();
}
function filter_where_date_lt( $where ) {
global $post, $wpdb;
$where .= " AND $wpdb->posts.post_date < '{$post->post_date}' ";
return $where;
}
function filter_where_date_gt( $where ) {
global $post, $wpdb;
$where .= " AND $wpdb->posts.post_date > '{$post->post_date}' ";
return $where;
}
}
?>
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