Question

get_the_category_list( string $separator = '',  string $parents = '',  int $post_id = false )

Retrieve category list for a post in either HTML list or custom format.

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description

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参数

$separator

(string) (Optional) Separator between the categories. By default, the links are placed in an unordered list. An empty string will result in the default behavior.

Default value: ''

$parents

(string) (Optional) How to display the parents.

Default value: ''

$post_id

(int) (Optional) Post ID to retrieve categories.

Default value: false

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返回值

(string)

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源代码

File: wp-includes/category-template.php

function get_the_category_list( $separator = '', $parents = '', $post_id = false ) {
	global $wp_rewrite;
	if ( ! is_object_in_taxonomy( get_post_type( $post_id ), 'category' ) ) {
		/** This filter is documented in wp-includes/category-template.php */
		return apply_filters( 'the_category', '', $separator, $parents );
	}

	/**
	 * Filters the categories before building the category list.
	 *
	 * @since 4.4.0
	 *
	 * @param array    $categories An array of the post's categories.
	 * @param int|bool $post_id    ID of the post we're retrieving categories for. When `false`, we assume the
	 *                             current post in the loop.
	 */
	$categories = apply_filters( 'the_category_list', get_the_category( $post_id ), $post_id );

	if ( empty( $categories ) ) {
		/** This filter is documented in wp-includes/category-template.php */
		return apply_filters( 'the_category', __( 'Uncategorized' ), $separator, $parents );
	}

	$rel = ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() ) ? 'rel="category tag"' : 'rel="category"';

	$thelist = '';
	if ( '' == $separator ) {
		$thelist .= '<ul class="post-categories">';
		foreach ( $categories as $category ) {
			$thelist .= "\n\t<li>";
			switch ( strtolower( $parents ) ) {
				case 'multiple':
					if ( $category->parent )
$thelist .= get_category_parents( $category->parent, true, $separator );
					$thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>' . $category->name.'</a></li>';
					break;
				case 'single':
					$thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '"  ' . $rel . '>';
					if ( $category->parent )
$thelist .= get_category_parents( $category->parent, false, $separator );
					$thelist .= $category->name.'</a></li>';
					break;
				case '':
				default:
					$thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>' . $category->name.'</a></li>';
			}
		}
		$thelist .= '</ul>';
	} else {
		$i = 0;
		foreach ( $categories as $category ) {
			if ( 0 < $i )
				$thelist .= $separator;
			switch ( strtolower( $parents ) ) {
				case 'multiple':
					if ( $category->parent )
$thelist .= get_category_parents( $category->parent, true, $separator );
					$thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>' . $category->name.'</a>';
					break;
				case 'single':
					$thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>';
					if ( $category->parent )
$thelist .= get_category_parents( $category->parent, false, $separator );
					$thelist .= "$category->name</a>";
					break;
				case '':
				default:
					$thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" ' . $rel . '>' . $category->name.'</a>';
			}
			++$i;
		}
	}

	/**
	 * Filters the category or list of categories.
	 *
	 * @since 1.2.0
	 *
	 * @param string $thelist   List of categories for the current post.
	 * @param string $separator Separator used between the categories.
	 * @param string $parents   How to display the category parents. Accepts 'multiple',
	 *                          'single', or empty.
	 */
	return apply_filters( 'the_category', $thelist, $separator, $parents );
}

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更新日志

Version	description
1.5.1	Introduced.

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相关函数

Uses

• wp-includes/category-template.php: the_category_list
• wp-includes/category-template.php: get_the_category()
• wp-includes/category-template.php: get_category_parents()
• wp-includes/category-template.php: get_category_link()
• wp-includes/category-template.php: the_category
• wp-includes/l10n.php: __()
• wp-includes/formatting.php: esc_url()
• wp-includes/taxonomy.php: is_object_in_taxonomy()
• wp-includes/plugin.php: apply_filters()
• wp-includes/post.php: get_post_type()
• wp-includes/class-wp-rewrite.php: WP_Rewrite::using_permalinks()
Show 6 more uses Hide more uses

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Used By

• wp-includes/category-template.php: the_category()

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User Contributed Notes

1. Skip to note content You must log in to vote on the helpfulness of this noteVote results for this note: 0You must log in to vote on the helpfulness of this note Contributed by Codex

   Implementation in WordPress default Twenty Eleven theme
   In content-single.php:

   
   <?php
   /* translators: used between list items, there is a space after the comma */
   $categories_list = get_the_category_list( __( ', ', 'twentyeleven' ) );
   
   /* translators: used between list items, there is a space after the comma */
   $tag_list = get_the_tag_list( '', __( ', ', 'twentyeleven' ) );
   if ( '' != $tag_list ) {
   	$utility_text = __( 'This entry was posted in %1$s and tagged %2$s by <a href="%6$s">%5$s</a>. Bookmark the <a href="%3$s" title="Permalink to %4$s" rel="bookmark">permalink</a>.', 'twentyeleven' );
   } elseif ( '' != $categories_list ) {
   	$utility_text = __( 'This entry was posted in %1$s by <a href="%6$s">%5$s</a>. Bookmark the <a href="%3$s" title="Permalink to %4$s" rel="bookmark">permalink</a>.', 'twentyeleven' );
   } else {
   	$utility_text = __( 'This entry was posted by <a href="%6$s">%5$s</a>. Bookmark the <a href="%3$s" title="Permalink to %4$s" rel="bookmark">permalink</a>.', 'twentyeleven' );
   }
   
   printf(
   	$utility_text,
   	$categories_list,
   	$tag_list,
   	esc_url( get_permalink() ),
   	the_title_attribute( 'echo=0' ),
   	get_the_author(),
   	esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) )
   );
   ?>
   
   

Display as List Items
By leaving the $separator value empty, it will generate an unordered list instead, complete with classes.

<?php echo get_the_category_list(); ?>

Result:

<ul class="post-categories">
	<li>
		<a href="http://myblog.com/category/business" title="View all posts in Business" rel="category tag">Business</a>
	</li>
</ul>