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Code Editor : class-breadcrumb-trail.php

<?php
/**
 * Breadcrumb Trail - A breadcrumb menu script for WordPress.
 *
 * Breadcrumb Trail is a script for showing a breadcrumb trail for any type of page. It tries to
 * anticipate any type of structure and display the best possible trail that matches your site's
 * permalink structure. While not perfect, it attempts to fill in the gaps left by many other
 * breadcrumb scripts.
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU
 * General Public License as published by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * @package BreadcrumbTrail
 * @version 1.1.0
 * @author Justin Tadlock <justin@justintadlock.com>
 * @copyright Copyright (c) 2008 - 2017, Justin Tadlock
 * @link https://themehybrid.com/plugins/breadcrumb-trail
 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 */

/**
 * Creates a breadcrumbs menu for the site based on the current page that's being viewed by the user.
 *
 * @since  0.6.0
 * @access public
 */
class Breadcrumb_Trail {

/**
	 * Array of items belonging to the current breadcrumb trail.
	 *
	 * @since  0.1.0
	 * @access public
	 * @var    array
	 */
	public $items = array();

/**
	 * Arguments used to build the breadcrumb trail.
	 *
	 * @since  0.1.0
	 * @access public
	 * @var    array
	 */
	public $args = array();

/**
	 * Array of text labels.
	 *
	 * @since  1.0.0
	 * @access public
	 * @var    array
	 */
	public $labels = array();

/**
	 * Array of post types (key) and taxonomies (value) to use for single post views.
	 *
	 * @since  1.0.0
	 * @access public
	 * @var    array
	 */
	public $post_taxonomy = array();

/* ====== Magic Methods ====== */

/**
	 * Magic method to use in case someone tries to output the layout object as a string.
	 * We'll just return the trail HTML.
	 *
	 * @since  1.0.0
	 * @access public
	 * @return string
	 */
	public function __toString() {
		return $this->trail();
	}

/**
	 * Sets up the breadcrumb trail properties.  Calls the `Breadcrumb_Trail::add_items()` method
	 * to creat the array of breadcrumb items.
	 *
	 * @since  0.6.0
	 * @access public
	 * @param  array $args  {
	 *     @type string    $container      Container HTML element. nav|div
	 *     @type string    $before         String to output before breadcrumb menu.
	 *     @type string    $after          String to output after breadcrumb menu.
	 *     @type string    $browse_tag     The HTML tag to use to wrap the "Browse" header text.
	 *     @type string    $list_tag       The HTML tag to use for the list wrapper.
	 *     @type string    $item_tag       The HTML tag to use for the item wrapper.
	 *     @type bool      $show_on_front  Whether to show when `is_front_page()`.
	 *     @type bool      $network        Whether to link to the network main site (multisite only).
	 *     @type bool      $show_title     Whether to show the title (last item) in the trail.
	 *     @type bool      $show_browse    Whether to show the breadcrumb menu header.
	 *     @type array     $labels         Text labels. @see Breadcrumb_Trail::set_labels()
	 *     @type array     $post_taxonomy  Taxonomies to use for post types. @see Breadcrumb_Trail::set_post_taxonomy()
	 *     @type bool      $echo           Whether to print or return the breadcrumbs.
	 * }
	 * @return void
	 */
	public function __construct( $args = array() ) {

$defaults = array(
			'container'     => 'nav',
			'before'        => '',
			'after'         => '',
			'browse_tag'    => 'h2',
			'list_tag'      => 'ul',
			'item_tag'      => 'li',
			'show_on_front' => true,
			'network'       => false,
			'show_title'    => true,
			'show_browse'   => true,
			'labels'        => array(),
			'post_taxonomy' => array(),
			'echo'          => true,
		);

// Parse the arguments with the deaults.
		$this->args = apply_filters( 'breadcrumb_trail_args', wp_parse_args( $args, $defaults ) );

// Set the labels and post taxonomy properties.
		$this->set_labels();
		$this->set_post_taxonomy();

// Let's find some items to add to the trail!
		$this->add_items();
	}

/* ====== Public Methods ====== */

/**
	 * Formats the HTML output for the breadcrumb trail.
	 *
	 * @since  0.6.0
	 * @access public
	 * @return string
	 */
	public function trail() {

// Set up variables that we'll need.
		$breadcrumb    = '';
		$item_count    = count( $this->items );
		$item_position = 0;

// Connect the breadcrumb trail if there are items in the trail.
		if ( 0 < $item_count ) {

// Add 'browse' label if it should be shown.
			if ( true === $this->args['show_browse'] ) {

$breadcrumb .= sprintf(
					'<%1$s class="trail-browse">%2$s</%1$s>',
					tag_escape( $this->args['browse_tag'] ),
					$this->labels['browse']
				);
			}

// Open the unordered list.
			$breadcrumb .= sprintf(
				'<%s class="trail-items" itemscope itemtype="http://schema.org/BreadcrumbList">',
				tag_escape( $this->args['list_tag'] )
			);

// Add the number of items and item list order schema.
			$breadcrumb .= sprintf( '<meta name="numberOfItems" content="%d" />', absint( $item_count ) );
			$breadcrumb .= '<meta name="itemListOrder" content="Ascending" />';

// Loop through the items and add them to the list.
			foreach ( $this->items as $item ) {

// Iterate the item position.
				++$item_position;

// Check if the item is linked.
				preg_match( '/(<a.*?>)(.*?)(<\/a>)/i', $item, $matches );

// Wrap the item text with appropriate itemprop.
				$item = ! empty( $matches ) ? sprintf( '%s%s%s', $matches[1], $matches[2], $matches[3] ) : sprintf( '%s', $item );

// Wrap the item with its itemprop.
				$item = ! empty( $matches )
					? preg_replace( '/(<a.*?)([\'"])>/i', '$1$2 itemprop=$2item$2>', $item )
					: sprintf( '%s', $item );

// Add list item classes.
				$item_class = 'trail-item';

if ( 1 === $item_position && 1 < $item_count ) {
					$item_class .= ' trail-begin';

} elseif ( $item_count === $item_position ) {
					$item_class .= ' trail-end';
				}

// Create list item attributes.
				$attributes = 'itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem" class="' . $item_class . '"';

// Build the meta position HTML.
				$meta = sprintf( '<meta itemprop="position" content="%s" />', absint( $item_position ) );

// Build the list item.
				$breadcrumb .= sprintf( '<%1$s %2$s>%3$s%4$s</%1$s>', tag_escape( $this->args['item_tag'] ), $attributes, $item, $meta );
			}

// Close the unordered list.
			$breadcrumb .= sprintf( '</%s>', tag_escape( $this->args['list_tag'] ) );

// Wrap the breadcrumb trail.
			$breadcrumb = sprintf(
				'<%1$s role="navigation" aria-label="%2$s" class="breadcrumb-trail breadcrumbs" itemprop="breadcrumb">%3$s%4$s%5$s</%1$s>',
				tag_escape( $this->args['container'] ),
				esc_attr( $this->labels['aria_label'] ),
				$this->args['before'],
				$breadcrumb,
				$this->args['after']
			);
		}

// Allow developers to filter the breadcrumb trail HTML.
		$breadcrumb = apply_filters( 'breadcrumb_trail', $breadcrumb, $this->args );

if ( false === $this->args['echo'] ) {
			return $breadcrumb;
		}

echo $breadcrumb;
	}

/* ====== Protected Methods ====== */

/**
	 * Sets the labels property.  Parses the inputted labels array with the defaults.
	 *
	 * @since  1.0.0
	 * @access protected
	 * @return void
	 */
	protected function set_labels() {

$defaults = array(
			'browse'              => esc_html__( 'Browse:', 'wise-blog' ),
			'aria_label'          => esc_attr_x( 'Breadcrumbs', 'breadcrumbs aria label', 'wise-blog' ),
			'home'                => esc_html__( 'Home', 'wise-blog' ),
			'error_404'           => esc_html__( '404 Not Found', 'wise-blog' ),
			'archives'            => esc_html__( 'Archives', 'wise-blog' ),
			// Translators: %s is the search query.
			'search'              => esc_html__( 'Search results for: %s', 'wise-blog' ),
			// Translators: %s is the page number.
			'paged'               => esc_html__( 'Page %s', 'wise-blog' ),
			// Translators: %s is the page number.
			'paged_comments'      => esc_html__( 'Comment Page %s', 'wise-blog' ),
			// Translators: Minute archive title. %s is the minute time format.
			'archive_minute'      => esc_html__( 'Minute %s', 'wise-blog' ),
			// Translators: Weekly archive title. %s is the week date format.
			'archive_week'        => esc_html__( 'Week %s', 'wise-blog' ),

// "%s" is replaced with the translated date/time format.
			'archive_minute_hour' => '%s',
			'archive_hour'        => '%s',
			'archive_day'         => '%s',
			'archive_month'       => '%s',
			'archive_year'        => '%s',
		);

$this->labels = apply_filters( 'breadcrumb_trail_labels', wp_parse_args( $this->args['labels'], $defaults ) );
	}

/**
	 * Sets the `$post_taxonomy` property.  This is an array of post types (key) and taxonomies (value).
	 * The taxonomy's terms are shown on the singular post view if set.
	 *
	 * @since  1.0.0
	 * @access protected
	 * @return void
	 */
	protected function set_post_taxonomy() {

$defaults = array();

// If post permalink is set to `%postname%`, use the `category` taxonomy.
		if ( '%postname%' === trim( get_option( 'permalink_structure' ), '/' ) ) {
			$defaults['post'] = 'category';
		}

$this->post_taxonomy = apply_filters( 'breadcrumb_trail_post_taxonomy', wp_parse_args( $this->args['post_taxonomy'], $defaults ) );
	}

/**
	 * Runs through the various WordPress conditional tags to check the current page being viewed.  Once
	 * a condition is met, a specific method is launched to add items to the `$items` array.
	 *
	 * @since  1.0.0
	 * @access protected
	 * @return void
	 */
	protected function add_items() {

// If viewing the front page.
		if ( is_front_page() ) {
			$this->add_front_page_items();
		}

// If not viewing the front page.
		else {

// Add the network and site home links.
			$this->add_network_home_link();
			$this->add_site_home_link();

// If viewing the home/blog page.
			if ( is_home() ) {
				$this->add_blog_items();
			}

// If viewing a single post.
			elseif ( is_singular() ) {
				$this->add_singular_items();
			}

// If viewing an archive page.
			elseif ( is_archive() ) {

if ( is_post_type_archive() ) {
					$this->add_post_type_archive_items();

} elseif ( is_category() || is_tag() || is_tax() ) {
					$this->add_term_archive_items();

} elseif ( is_author() ) {
					$this->add_user_archive_items();

} elseif ( get_query_var( 'minute' ) && get_query_var( 'hour' ) ) {
					$this->add_minute_hour_archive_items();

} elseif ( get_query_var( 'minute' ) ) {
					$this->add_minute_archive_items();

} elseif ( get_query_var( 'hour' ) ) {
					$this->add_hour_archive_items();

} elseif ( is_day() ) {
					$this->add_day_archive_items();

} elseif ( get_query_var( 'w' ) ) {
					$this->add_week_archive_items();

} elseif ( is_month() ) {
					$this->add_month_archive_items();

} elseif ( is_year() ) {
					$this->add_year_archive_items();

} else {
					$this->add_default_archive_items();
				}
			}

// If viewing a search results page.
			elseif ( is_search() ) {
				$this->add_search_items();
			}

// If viewing the 404 page.
			elseif ( is_404() ) {
				$this->add_404_items();
			}
		}

// Add paged items if they exist.
		$this->add_paged_items();

// Allow developers to overwrite the items for the breadcrumb trail.
		$this->items = array_unique( apply_filters( 'breadcrumb_trail_items', $this->items, $this->args ) );
	}

/**
	 * Gets front items based on $wp_rewrite->front.
	 *
	 * @since  1.0.0
	 * @access protected
	 * @return void
	 */
	protected function add_rewrite_front_items() {
		global $wp_rewrite;

if ( $wp_rewrite->front ) {
			$this->add_path_parents( $wp_rewrite->front );
		}
	}

/**
	 * Adds the page/paged number to the items array.
	 *
	 * @since  1.0.0
	 * @access protected
	 * @return void
	 */
	protected function add_paged_items() {

// If viewing a paged singular post.
		if ( is_singular() && 1 < get_query_var( 'page' ) && true === $this->args['show_title'] ) {
			$this->items[] = sprintf( $this->labels['paged'], number_format_i18n( absint( get_query_var( 'page' ) ) ) );
		}

// If viewing a singular post with paged comments.
		elseif ( is_singular() && get_option( 'page_comments' ) && 1 < get_query_var( 'cpage' ) ) {
			$this->items[] = sprintf( $this->labels['paged_comments'], number_format_i18n( absint( get_query_var( 'cpage' ) ) ) );
		}

// If viewing a paged archive-type page.
		elseif ( is_paged() && true === $this->args['show_title'] ) {
			$this->items[] = sprintf( $this->labels['paged'], number_format_i18n( absint( get_query_var( 'paged' ) ) ) );
		}
	}

/**
	 * Adds the network (all sites) home page link to the items array.
	 *
	 * @since  1.0.0
	 * @access protected
	 * @return void
	 */
	protected function add_network_home_link() {

if ( is_multisite() && ! is_main_site() && true === $this->args['network'] ) {
			$this->items[] = sprintf( '<a href="%s" rel="home">%s</a>', esc_url( network_home_url() ), $this->labels['home'] );
		}
	}

/**
	 * Adds the current site's home page link to the items array.
	 *
	 * @since  1.0.0
	 * @access protected
	 * @return void
	 */
	protected function add_site_home_link() {

$network = is_multisite() && ! is_main_site() && true === $this->args['network'];
		$label   = $network ? get_bloginfo( 'name' ) : $this->labels['home'];
		$rel     = $network ? '' : ' rel="home"';

$this->items[] = sprintf( '<a href="%s"%s>%s</a>', esc_url( user_trailingslashit( home_url() ) ), $rel, $label );
	}

/**
	 * Adds items for the front page to the items array.
	 *
	 * @since  1.0.0
	 * @access protected
	 * @return void
	 */
	protected function add_front_page_items() {

// Only show front items if the 'show_on_front' argument is set to 'true'.
		if ( true === $this->args['show_on_front'] || is_paged() || ( is_singular() && 1 < get_query_var( 'page' ) ) ) {

// Add network home link.
			$this->add_network_home_link();

// If on a paged view, add the site home link.
			if ( is_paged() ) {
				$this->add_site_home_link();
			}

// If on the main front page, add the network home title.
			elseif ( true === $this->args['show_title'] ) {
				$this->items[] = is_multisite() && true === $this->args['network'] ? get_bloginfo( 'name' ) : $this->labels['home'];
			}
		}
	}

/**
	 * Adds items for the posts page (i.e., is_home()) to the items array.
	 *
	 * @since  1.0.0
	 * @access protected
	 * @return void
	 */
	protected function add_blog_items() {

// Get the post ID and post.
		$post_id = get_queried_object_id();
		$post    = get_post( $post_id );

// If the post has parents, add them to the trail.
		if ( 0 < $post->post_parent ) {
			$this->add_post_parents( $post->post_parent );
		}

// Get the page title.
		$title = get_the_title( $post_id );

// Add the posts page item.
		if ( is_paged() ) {
			$this->items[] = sprintf( '<a href="%s">%s</a>', esc_url( get_permalink( $post_id ) ), $title );

} elseif ( $title && true === $this->args['show_title'] ) {
			$this->items[] = $title;
		}
	}

/**
	 * Adds singular post items to the items array.
	 *
	 * @since  1.0.0
	 * @access protected
	 * @return void
	 */
	protected function add_singular_items() {

// Get the queried post.
		$post    = get_queried_object();
		$post_id = get_queried_object_id();

// If the post has a parent, follow the parent trail.
		if ( 0 < $post->post_parent ) {
			$this->add_post_parents( $post->post_parent );
		}

// If the post doesn't have a parent, get its hierarchy based off the post type.
		else {
			$this->add_post_hierarchy( $post_id );
		}

// Display terms for specific post type taxonomy if requested.
		if ( ! empty( $this->post_taxonomy[ $post->post_type ] ) ) {
			$this->add_post_terms( $post_id, $this->post_taxonomy[ $post->post_type ] );
		}

// End with the post title.
		if ( $post_title = single_post_title( '', false ) ) {

if ( ( 1 < get_query_var( 'page' ) || is_paged() ) || ( get_option( 'page_comments' ) && 1 < absint( get_query_var( 'cpage' ) ) ) ) {
				$this->items[] = sprintf( '<a href="%s">%s</a>', esc_url( get_permalink( $post_id ) ), $post_title );

} elseif ( true === $this->args['show_title'] ) {
				$this->items[] = $post_title;
			}
		}
	}

/**
	 * Adds the items to the trail items array for taxonomy term archives.
	 *
	 * @since  1.0.0
	 * @access protected
	 * @global object $wp_rewrite
	 * @return void
	 */
	protected function add_term_archive_items() {
		global $wp_rewrite;

// Get some taxonomy and term variables.
		$term           = get_queried_object();
		$taxonomy       = get_taxonomy( $term->taxonomy );
		$done_post_type = false;

// If there are rewrite rules for the taxonomy.
		if ( false !== $taxonomy->rewrite ) {

// If 'with_front' is true, dd $wp_rewrite->front to the trail.
			if ( $taxonomy->rewrite['with_front'] && $wp_rewrite->front ) {
				$this->add_rewrite_front_items();
			}

// Get parent pages by path if they exist.
			$this->add_path_parents( $taxonomy->rewrite['slug'] );

// Add post type archive if its 'has_archive' matches the taxonomy rewrite 'slug'.
			if ( $taxonomy->rewrite['slug'] ) {

$slug = trim( $taxonomy->rewrite['slug'], '/' );

// Deals with the situation if the slug has a '/' between multiple
				// strings. For example, "movies/genres" where "movies" is the post
				// type archive.
				$matches = explode( '/', $slug );

// If matches are found for the path.
				if ( isset( $matches ) ) {

// Reverse the array of matches to search for posts in the proper order.
					$matches = array_reverse( $matches );

// Loop through each of the path matches.
					foreach ( $matches as $match ) {

// If a match is found.
						$slug = $match;

// Get public post types that match the rewrite slug.
						$post_types = $this->get_post_types_by_slug( $match );

if ( ! empty( $post_types ) ) {

$post_type_object = $post_types[0];

// Add support for a non-standard label of 'archive_title' (special use case).
							$label = ! empty( $post_type_object->labels->archive_title ) ? $post_type_object->labels->archive_title : $post_type_object->labels->name;

// Core filter hook.
							$label = apply_filters( 'post_type_archive_title', $label, $post_type_object->name );

// Add the post type archive link to the trail.
							$this->items[] = sprintf( '<a href="%s">%s</a>', esc_url( get_post_type_archive_link( $post_type_object->name ) ), $label );

$done_post_type = true;

// Break out of the loop.
							break;
						}
					}
				}
			}
		}

// If there's a single post type for the taxonomy, use it.
		if ( false === $done_post_type && 1 === count( $taxonomy->object_type ) && post_type_exists( $taxonomy->object_type[0] ) ) {

// If the post type is 'post'.
			if ( 'post' === $taxonomy->object_type[0] ) {
				$post_id = get_option( 'page_for_posts' );

if ( 'posts' !== get_option( 'show_on_front' ) && 0 < $post_id ) {
					$this->items[] = sprintf( '<a href="%s">%s</a>', esc_url( get_permalink( $post_id ) ), get_the_title( $post_id ) );
				}

// If the post type is not 'post'.
			} else {
				$post_type_object = get_post_type_object( $taxonomy->object_type[0] );

$label = ! empty( $post_type_object->labels->archive_title ) ? $post_type_object->labels->archive_title : $post_type_object->labels->name;

// Core filter hook.
				$label = apply_filters( 'post_type_archive_title', $label, $post_type_object->name );

$this->items[] = sprintf( '<a href="%s">%s</a>', esc_url( get_post_type_archive_link( $post_type_object->name ) ), $label );
			}
		}

// If the taxonomy is hierarchical, list its parent terms.
		if ( is_taxonomy_hierarchical( $term->taxonomy ) && $term->parent ) {
			$this->add_term_parents( $term->parent, $term->taxonomy );
		}

// Add the term name to the trail end.
		if ( is_paged() ) {
			$this->items[] = sprintf( '<a href="%s">%s</a>', esc_url( get_term_link( $term, $term->taxonomy ) ), single_term_title( '', false ) );

} elseif ( true === $this->args['show_title'] ) {
			$this->items[] = single_term_title( '', false );
		}
	}

/**
	 * Adds the items to the trail items array for post type archives.
	 *
	 * @since  1.0.0
	 * @access protected
	 * @return void
	 */
	protected function add_post_type_archive_items() {

// Get the post type object.
		$post_type_object = get_post_type_object( get_query_var( 'post_type' ) );

if ( false !== $post_type_object->rewrite ) {

// If 'with_front' is true, add $wp_rewrite->front to the trail.
			if ( $post_type_object->rewrite['with_front'] ) {
				$this->add_rewrite_front_items();
			}

// If there's a rewrite slug, check for parents.
			if ( ! empty( $post_type_object->rewrite['slug'] ) ) {
				$this->add_path_parents( $post_type_object->rewrite['slug'] );
			}
		}

// Add the post type [plural] name to the trail end.
		if ( is_paged() || is_author() ) {
			$this->items[] = sprintf( '<a href="%s">%s</a>', esc_url( get_post_type_archive_link( $post_type_object->name ) ), post_type_archive_title( '', false ) );

} elseif ( true === $this->args['show_title'] ) {
			$this->items[] = post_type_archive_title( '', false );
		}

// If viewing a post type archive by author.
		if ( is_author() ) {
			$this->add_user_archive_items();
		}
	}

/**
	 * Adds the items to the trail items array for user (author) archives.
	 *
	 * @since  1.0.0
	 * @access protected
	 * @global object $wp_rewrite
	 * @return void
	 */
	protected function add_user_archive_items() {
		global $wp_rewrite;