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PHP

<?php
/**
* Module Name: Related Posts
* Module Description: Display links to related site content under your posts.
* First Introduced: 2.9
* Sort Order: 5
* Requires Connection: Yes
* Auto Activate: No
*/
class Jetpack_RelatedPosts_Module {
/**
* Class variables
*/
private static $__instance = null;
/**
* Singleton implementation
*
* @return object
*/
public static function instance() {
if ( ! is_a( self::$__instance, 'Jetpack_RelatedPosts_Module' ) )
self::$__instance = new Jetpack_RelatedPosts_Module();
return self::$__instance;
}
/**
* Register actions and filters
*
* @uses add_action, add_filter
* @return null
*/
private function __construct() {
add_action( 'jetpack_module_loaded_related-posts', array( $this, 'action_on_load' ) );
add_action( 'jetpack_activate_module_related-posts', array( $this, 'action_on_activate' ) );
}
/**
* This action triggers when module is activated.
*
* @uses self::_get_post_count_local, self::_get_post_count_cloud, Jetpack::init, Jetpack::sync_reindex_trigger
* @return null
*/
public function action_on_activate() {
// Trigger reindex if we have a post count mismatch
if ( $this->_get_post_count_local() != $this->_get_post_count_cloud() ) {
Jetpack::init()->sync->reindex_trigger();
}
}
/**
* This action triggers if the module is in an active state, load related posts and options.
*
* @uses Jetpack_RelatedPosts::init, is_admin, Jetpack::enable_module_configurable, Jetpack::module_configuration_load, Jetpack_Sync::sync_posts
* @return null
*/
public function action_on_load() {
require_once 'related-posts/jetpack-related-posts.php';
Jetpack_RelatedPosts::init();
if ( is_admin() ) {
// Enable "Configure" button on module card
Jetpack::enable_module_configurable( __FILE__ );
Jetpack::module_configuration_load( __FILE__, array( $this, 'module_configuration_load' ) );
// Sync new posts
Jetpack_Sync::sync_posts( __FILE__ );
}
}
/**
* Redirect configure button to Settings > Reading
*
* @uses wp_safe_redirect, admin_url
* @return null
*/
public function module_configuration_load() {
wp_safe_redirect( admin_url( 'options-reading.php#jetpack_relatedposts' ) );
exit;
}
private function _get_post_count_local() {
global $wpdb;
return (int) $wpdb->get_var(
"SELECT count(*)
FROM {$wpdb->posts}
WHERE post_type = 'post' AND post_status = 'publish' AND post_password = ''"
);
}
private function _get_post_count_cloud() {
$blog_id = Jetpack::init()->get_option( 'id' );
$body = array(
'size' => 1,
);
$response = wp_remote_post(
"https://public-api.wordpress.com/rest/v1/sites/$blog_id/search",
array(
'timeout' => 10,
'user-agent' => 'jetpack_related_posts',
'sslverify' => true,
'body' => $body,
)
);
if ( is_wp_error( $response ) ) {
return 0;
}
$results = json_decode( wp_remote_retrieve_body( $response ), true );
return (int) $results['results']['total'];
}
}
// Do it.
Jetpack_RelatedPosts_Module::instance();