Viewing file:  class-yoast-notification-center.php (3.35 KB) -rw-rw-rw-
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<?php
/**
* @package WPSEO\Admin
*/
/**
* Handles notifications storage and display.
*/
class Yoast_Notification_Center {
const TRANSIENT_KEY = 'yoast_notifications';
/**
* The singleton instance of this object
*
* @var \Yoast_Notification_Center
*/
private static $instance = null;
/**
* @var array
*/
private $notifications = array();
/**
* Construct
*/
private function __construct() {
// Load the notifications from cookie
$this->notifications = $this->get_notifications_from_transient();
// Clear the cookie
if ( count( $this->notifications ) > 0 ) {
$this->remove_transient();
}
add_action( 'all_admin_notices', array( $this, 'display_notifications' ) );
add_action( 'shutdown', array( $this, 'set_transient' ) );
add_action( 'wp_ajax_yoast_get_notifications', array( $this, 'ajax_get_notifications' ) );
}
/**
* Singleton getter
*
* @return Yoast_Notification_Center
*/
public static function get() {
if ( null == self::$instance ) {
self::$instance = new self();
}
return self::$instance;
}
/**
* Get the notifications from cookie
*
* @return array
*/
private function get_notifications_from_transient() {
// The notifications array
$notifications = array();
$transient_notifications = get_transient( self::TRANSIENT_KEY );
// Check if cookie is set
if ( false !== $transient_notifications ) {
// Get json notifications from cookie
$json_notifications = json_decode( $transient_notifications, true );
// Create Yoast_Notification objects
if ( count( $json_notifications ) > 0 ) {
foreach ( $json_notifications as $json_notification ) {
$notifications[] = new Yoast_Notification( $json_notification['message'], $json_notification['options'] );
}
}
}
return $notifications;
}
/**
* Clear the cookie
*/
private function remove_transient() {
delete_transient( self::TRANSIENT_KEY );
}
/**
* Clear local stored notifications
*/
private function clear_notifications() {
$this->notifications = array();
}
/**
* Write the notifications to a cookie (hooked on shutdown)
*/
public function set_transient() {
// Count local stored notifications
if ( count( $this->notifications ) > 0 ) {
// Create array with all notifications
$arr_notifications = array();
// Add each notification as array to $arr_notifications
foreach ( $this->notifications as $notification ) {
$arr_notifications[] = $notification->to_array();
}
// Set the cookie with notifications
set_transient( self::TRANSIENT_KEY, json_encode( $arr_notifications ), ( MINUTE_IN_SECONDS * 10 ) );
}
}
/**
* Add notification to the cookie
*
* @param Yoast_Notification $notification
*/
public function add_notification( Yoast_Notification $notification ) {
$this->notifications[] = $notification;
}
/**
* Display the notifications
*/
public function display_notifications() {
$this->notifications = array_unique( $this->notifications );
// Display notifications
if ( count( $this->notifications ) > 0 ) {
foreach ( $this->notifications as $notification ) {
echo $notification;
}
}
// Clear the local stored notifications
$this->clear_notifications();
}
/**
* AJAX display notifications
*/
public function ajax_get_notifications() {
// Display the notices
$this->display_notifications();
// AJAX die
exit;
}
}
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