class-schema-event-frontpage.php

<?php
/**
 * This file houses the class that Extends the Yoast Schema Graph for course events
 *
 * @package ef/inc
 */

if ( interface_exists( 'WPSEO_Graph_Piece' ) ) {
	/**
	 * The class that extends WPSEO_Graph_Piece to display event schema for courses.
	 */
	class Schema_Event_Frontpage implements WPSEO_Graph_Piece {
		/**
		 * A value object with context variables.
		 *
		 * @var WPSEO_Schema_Context
		 */
		private $context;
		/**
		 * Schema_Event constructor.
		 *
		 * @param WPSEO_Schema_Context $context Value object with context variables.
		 */
		public function __construct( WPSEO_Schema_Context $context ) {
			$this->context = $context;
		}
		/**
		 * Determines whether or not a piece should be added to the graph.
		 *
		 * @return bool
		 */
		public function is_needed() {
			global $wp_query;

			if ( is_front_page() ) {
				return true;
			}

			return false;
		}
		/**
		 * Adds our Event piece of the graph.
		 *
		 * @return array $graph Event Schema markup
		 */
		public function generate() {
			$data = array();

			$meta_query = array(
				array(
					'key'     => '_EventEndDate',
					'value'   => date( 'Y-m-d H:i:s' ),
					'compare' => '>=',
				),
			);

			$args = array(
				'post_type'      => 'tribe_events',
				'posts_per_page' => 10,
				'meta_query'     => $meta_query,
				'orderby'        => 'meta_value',
			);

			$upcoming_events = new WP_Query( $args );

			if ( $upcoming_events->have_posts() ) {
				while ( $upcoming_events->have_posts() ) {
					$upcoming_events->the_post();
					$args       = array();
					$tribe_data = Tribe__Events__JSON_LD__Event::instance()->get_data( $post );

					// Strip the post ID indexing before returning.
					$tribe_data = array_values( $tribe_data );

					if ( count( $tribe_data ) > 0 ) {
						$_tribe_data = (array) $tribe_data[0];
						$data[]      = $_tribe_data;
					}
				}
			}
			wp_reset_query();

			return $data;
		}
	}
}