get_boundary_post()获取最新/最旧文章

目录

描述

译文

根据发布日期获取 一篇 最后 篇文章。

原文

Get the first or last post by publish date

get_boundary_post() 描述

用法

<?php get_boundary_post$in_same_cat$excluded_categories$start ); ?>

get_boundary_post() 用法

参数

$in_same_cat

(boolean) (可选) Whether post should be in same category.

默认值: false

$excluded_categories

(string) (可选) Excluded categories IDs.

默认值: ''

$start

(boolean) (可选) True to begin at the beginning

默认值: true

get_boundary_post() 参数

返回值

  • Post object if successful.
  • Null if global $post is not set.
  • Empty string if no corresponding post exists.

get_boundary_post() 返回值

注意

get_boundary_post() will set the post pointer to the first post.

get_boundary_post() 注意

历史

添加于 版本: 2.8.0

get_boundary_post() 历史

源文件

get_boundary_post() 函数的 码位于 wp-includes/link-template.php.

/* ----------------------------------
 * wordpress之魂 © http://wphun.com
 * ---------------------------------- */
/**
 * Retrieve boundary post.
 *
 * Boundary being either the first or last post by publish date within the constraints specified
 * by $in_same_term or $excluded_terms.
 *
 * @since 2.8.0
 *
 * @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 null|array Array containing the boundary post object if successful, null otherwise.
 */
function get_boundary_post( $in_same_term = false, $excluded_terms = '', $start = true, $taxonomy = 'category' ) {
	$post = get_post();
	if ( ! $post || ! is_single() || is_attachment() || ! taxonomy_exists( $taxonomy ) )
		return null;

	$query_args = array(
		'posts_per_page' => 1,
		'order' => $start ? 'ASC' : 'DESC',
		'update_post_term_cache' => false,
		'update_post_meta_cache' => false
	);

	$term_array = array();

	if ( ! is_array( $excluded_terms ) ) {
		if ( ! empty( $excluded_terms ) )
			$excluded_terms = explode( ',', $excluded_terms );
		else
			$excluded_terms = array();
	}

	if ( $in_same_term || ! empty( $excluded_terms ) ) {
		if ( $in_same_term )
			$term_array = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'ids' ) );

		if ( ! empty( $excluded_terms ) ) {
			$excluded_terms = array_map( 'intval', $excluded_terms );
			$excluded_terms = array_diff( $excluded_terms, $term_array );

			$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 );
}

get_boundary_post() 源文件