Connects the Events Manager plugin with SNIP.

snip-events-manager-bridge.php

<?php
/*
Plugin Name: SNIP bridge to the Events Manager Plugin.
Description: Bridge-Plugin to connect SNIP with the Events Manager Plugin.
Author: Florian Simeth
Version: 0.1.0
Author URI: https://rich-snippets.io
Plugin URI: https://rich-snippets.io/how-to-generate-structured-data-for-the-events-manager-plugin/
*/

namespace snip\bridge\events_manager;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
} // Exit if accessed directly


add_filter(
	'wpbuddy/rich_snippets/fields/internal_subselect/values',
	'snip\bridge\events_manager\subselects',
	30
);

/**
 * Adds new field to use in Global Snippets in the SNIP plugin.
 *
 * @param array $values
 *
 * @return array
 * @since 0.1.0
 *
 */
function subselects( $values ) {

	$values['http://schema.org/PostalAddress'][] = [
		'id'     => 'events_manager_location',
		'label'  => esc_html_x( 'Events Manager: Location', 'subselect field', 'snip-b-events-manager' ),
		'method' => 'snip\bridge\events_manager\location',
	];

	$values['http://schema.org/Date'][] = [
		'id'     => 'events_manager_date_start',
		'label'  => esc_html_x( 'Events Manager: Start date and time', 'subselect field', 'snip-b-events-manager' ),
		'method' => 'snip\bridge\events_manager\date_start',
	];

	$values['http://schema.org/Date'][] = [
		'id'     => 'events_manager_date_end',
		'label'  => esc_html_x( 'Events Manager: End date and time', 'subselect field', 'snip-b-events-manager' ),
		'method' => 'snip\bridge\events_manager\date_end',
	];

	$values['http://schema.org/EventAttendanceModeEnumeration'][] = [
		'id'     => 'events_manager_date_end',
		'label'  => esc_html_x( 'Events Manager: End date and time', 'subselect field', 'snip-b-events-manager' ),
		'method' => 'snip\bridge\events_manager\date_end',
	];

	return $values;
}

function get_location_from_post( $post_id ) {
	$location_id = (int) get_post_meta( $post_id, '_location_id', true );

	if ( $location_id <= 0 ) {
		return false;
	}

	if ( ! function_exists( '\em_get_location' ) ) {
		return false;
	}

	/**
	 * @var \EM_Location $location
	 */
	$location = em_get_location( $location_id );

	if ( ! $location instanceof \EM_Location ) {
		return false;
	}

	return $location;
}

function location( $val, \wpbuddy\rich_snippets\Rich_Snippet $rich_snippet, array $meta_info ) {
	$location_type = (string) get_post_meta( $meta_info['current_post_id'], '_event_location_type', true );

	$o               = new \stdClass();
	$o->{'@context'} = "https://schema.org";

	if ( 'url' === $location_type ) {
		$location_url = (string) get_post_meta( $meta_info['current_post_id'], '_event_location_url', true );
		if ( empty( $location_url ) ) {
			return '';
		}

		$o->{'@type'} = "VirtualLocation";
		$o->url       = esc_url( $location_url );

		return $o;
	}

	$location = get_location_from_post( $meta_info['current_post_id'] );

	if ( ! $location ) {
		return '';
	}

	$o->{'@type'}                = "Place";
	$o->name                     = $location->name;
	$o->address                  = new \stdClass();
	$o->address->{'@context'}    = "https://schema.org";
	$o->address->{'@type'}       = "PostalAddress";
	$o->address->postalCode      = $location->location_postcode;
	$o->address->streetAddress   = $location->location_address;
	$o->address->addressLocality = $location->location_town;
	$o->address->addressCountry  = $location->location_country;
	$o->address->addressRegion   = $location->location_region;

	return $o;
}

function date_start( $val, \wpbuddy\rich_snippets\Rich_Snippet $rich_snippet, array $meta_info ) {
	$is_all_day_event = 1 === (int) get_post_meta( $meta_info['current_post_id'], '_event_all_day', true );

	$start_date = get_post_meta( $meta_info['current_post_id'], '_event_start', true );
	$timezone   = get_post_meta( $meta_info['current_post_id'], '_event_timezone', true );

	try {
		$start_date = new \DateTime(
			$start_date,
			new \DateTimeZone( $timezone )
		);
	} catch ( \Exception $e ) {
		return '';
	}

	if ( $is_all_day_event ) {
		return $start_date->format( 'o-m-d' );
	}

	return $start_date->format( 'c' );
}

function date_end( $val, \wpbuddy\rich_snippets\Rich_Snippet $rich_snippet, array $meta_info ) {
	$is_all_day_event = 1 === (int) get_post_meta( $meta_info['current_post_id'], '_event_all_day', true );

	$end_date = get_post_meta( $meta_info['current_post_id'], '_event_end', true );
	$timezone   = get_post_meta( $meta_info['current_post_id'], '_event_timezone', true );

	try {
		$end_date = new \DateTime(
			$end_date,
			new \DateTimeZone( $timezone )
		);
	} catch ( \Exception $e ) {
		return '';
	}

	if ( $is_all_day_event ) {
		return $end_date->format( 'o-m-d' );
	}

	return $end_date->format( 'c' );
}

Learn more about how to create Structured Data for the Events Manager plugin together with SNIP.