<?php

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/**

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* WPSEO plugin file.

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*

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* @package WPSEO\Admin\Notifications

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*/

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use Yoast\WP\SEO\Presenters\Abstract_Presenter;

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/**

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* Handles notifications storage and display.

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*/

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class Yoast_Notification_Center {

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/**

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* Option name to store notifications on.

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*

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* @var string

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*/

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public const STORAGE_KEY = 'yoast_notifications';

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/**

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* The singleton instance of this object.

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*

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* @var Yoast_Notification_Center

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*/

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private static $instance = null;

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/**

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* Holds the notifications.

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*

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* @var Yoast_Notification[][]

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*/

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private $notifications = [];

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/**

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* Notifications there are newly added.

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*

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* @var array

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*/

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private $new = [];

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/**

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* Notifications that were resolved this execution.

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*

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* @var int

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*/

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private $resolved = 0;

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/**

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* Internal storage for transaction before notifications have been retrieved from storage.

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*

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* @var array

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*/

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private $queued_transactions = [];

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/**

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* Internal flag for whether notifications have been retrieved from storage.

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*

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* @var bool

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*/

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private $notifications_retrieved = false;

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/**

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* Internal flag for whether notifications need to be updated in storage.

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*

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* @var bool

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*/

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private $notifications_need_storage = false;

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/**

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* Construct.

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*/

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private function __construct() {

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add_action( 'init', [ $this, 'setup_current_notifications' ], 1 );

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add_action( 'all_admin_notices', [ $this, 'display_notifications' ] );

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add_action( 'wp_ajax_yoast_get_notifications', [ $this, 'ajax_get_notifications' ] );

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add_action( 'wpseo_deactivate', [ $this, 'deactivate_hook' ] );

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add_action( 'shutdown', [ $this, 'update_storage' ] );

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}

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/**

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* Singleton getter.

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*

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* @return Yoast_Notification_Center

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*/

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public static function get() {

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if ( self::$instance === null ) {

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self::$instance = new self();

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}

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return self::$instance;

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}

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/**

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* Dismiss a notification.

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*

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* @return void

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*/

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public static function ajax_dismiss_notification() {

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$notification_center = self::get();

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if ( ! isset( $_POST['notification'] ) || ! is_string( $_POST['notification'] ) ) {

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die( '-1' );

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}

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$notification_id = sanitize_text_field( wp_unslash( $_POST['notification'] ) );

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if ( empty( $notification_id ) ) {

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die( '-1' );

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}

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// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Reason: We are using the variable as a nonce.

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if ( ! isset( $_POST['nonce'] ) || ! wp_verify_nonce( wp_unslash( $_POST['nonce'] ), $notification_id ) ) {

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die( '-1' );

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}

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$notification = $notification_center->get_notification_by_id( $notification_id );

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if ( ( $notification instanceof Yoast_Notification ) === false ) {

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// Permit legacy.

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$options = [

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'id' => $notification_id,

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'dismissal_key' => $notification_id,

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];

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$notification = new Yoast_Notification( '', $options );

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}

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if ( self::maybe_dismiss_notification( $notification ) ) {

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die( '1' );

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}

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die( '-1' );

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}

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/**

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* Check if the user has dismissed a notification.

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*

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* @param Yoast_Notification $notification The notification to check for dismissal.

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* @param int|null $user_id User ID to check on.

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*

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* @return bool

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*/

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public static function is_notification_dismissed( Yoast_Notification $notification, $user_id = null ) {

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$user_id = self::get_user_id( $user_id );

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$dismissal_key = $notification->get_dismissal_key();

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// This checks both the site-specific user option and the meta value.

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$current_value = get_user_option( $dismissal_key, $user_id );

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// Migrate old user meta to user option on-the-fly.

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if ( ! empty( $current_value )

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&& metadata_exists( 'user', $user_id, $dismissal_key )

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&& update_user_option( $user_id, $dismissal_key, $current_value ) ) {

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delete_user_meta( $user_id, $dismissal_key );

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}

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return ! empty( $current_value );

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}

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/**

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* Checks if the notification is being dismissed.

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*

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* @param Yoast_Notification $notification Notification to check dismissal of.

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* @param string $meta_value Value to set the meta value to if dismissed.

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*

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* @return bool True if dismissed.

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*/

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public static function maybe_dismiss_notification( Yoast_Notification $notification, $meta_value = 'seen' ) {

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// Only persistent notifications are dismissible.

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if ( ! $notification->is_persistent() ) {

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return false;

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}

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// If notification is already dismissed, we're done.

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if ( self::is_notification_dismissed( $notification ) ) {

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return true;

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}

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$dismissal_key = $notification->get_dismissal_key();

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$notification_id = $notification->get_id();

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$is_dismissing = ( $dismissal_key === self::get_user_input( 'notification' ) );

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if ( ! $is_dismissing ) {

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$is_dismissing = ( $notification_id === self::get_user_input( 'notification' ) );

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}

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// Fallback to ?dismissal_key=1&nonce=bla when JavaScript fails.

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if ( ! $is_dismissing ) {

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$is_dismissing = ( self::get_user_input( $dismissal_key ) === '1' );

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}

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if ( ! $is_dismissing ) {

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return false;

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}

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$user_nonce = self::get_user_input( 'nonce' );

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if ( wp_verify_nonce( $user_nonce, $notification_id ) === false ) {

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return false;

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}

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return self::dismiss_notification( $notification, $meta_value );

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}

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/**

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* Dismisses a notification.

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*

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* @param Yoast_Notification $notification Notification to dismiss.

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* @param string $meta_value Value to save in the dismissal.

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*

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* @return bool True if dismissed, false otherwise.

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*/

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public static function dismiss_notification( Yoast_Notification $notification, $meta_value = 'seen' ) {

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// Dismiss notification.

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return update_user_option( get_current_user_id(), $notification->get_dismissal_key(), $meta_value ) !== false;

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}

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/**

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* Restores a notification.

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*

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* @param Yoast_Notification $notification Notification to restore.

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*

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* @return bool True if restored, false otherwise.

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*/

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public static function restore_notification( Yoast_Notification $notification ) {

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$user_id = get_current_user_id();

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$dismissal_key = $notification->get_dismissal_key();

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// Restore notification.

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$restored = delete_user_option( $user_id, $dismissal_key );

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// Delete unprefixed user meta too for backward-compatibility.

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if ( metadata_exists( 'user', $user_id, $dismissal_key ) ) {

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$restored = delete_user_meta( $user_id, $dismissal_key ) && $restored;

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}

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return $restored;

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}

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/**

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* Clear dismissal information for the specified Notification.

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*

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* When a cause is resolved, the next time it is present we want to show

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* the message again.

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*

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* @param string|Yoast_Notification $notification Notification to clear the dismissal of.

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*

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* @return bool

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*/

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public function clear_dismissal( $notification ) {

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global $wpdb;

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if ( $notification instanceof Yoast_Notification ) {

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$dismissal_key = $notification->get_dismissal_key();

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}

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if ( is_string( $notification ) ) {

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$dismissal_key = $notification;

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}

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if ( empty( $dismissal_key ) ) {

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return false;

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}

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// Remove notification dismissal for all users.

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$deleted = delete_metadata( 'user', 0, $wpdb->get_blog_prefix() . $dismissal_key, '', true );

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// Delete unprefixed user meta too for backward-compatibility.

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$deleted = delete_metadata( 'user', 0, $dismissal_key, '', true ) || $deleted;

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return $deleted;

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}

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/**

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* Retrieves notifications from the storage and merges in previous notification changes.

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*

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* The current user in WordPress is not loaded shortly before the 'init' hook, but the plugin

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* sometimes needs to add or remove notifications before that. In such cases, the transactions

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* are not actually executed, but added to a queue. That queue is then handled in this method,

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* after notifications for the current user have been set up.

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*

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* @return void

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*/

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public function setup_current_notifications() {

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$this->retrieve_notifications_from_storage( get_current_user_id() );

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foreach ( $this->queued_transactions as $transaction ) {

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list( $callback, $args ) = $transaction;

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call_user_func_array( $callback, $args );

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}

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$this->queued_transactions = [];

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}

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/**

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* Add notification to the cookie.

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*

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* @param Yoast_Notification $notification Notification object instance.

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*

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* @return void

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*/

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public function add_notification( Yoast_Notification $notification ) {

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$callback = [ $this, __FUNCTION__ ];

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$args = func_get_args();

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if ( $this->queue_transaction( $callback, $args ) ) {

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return;

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}

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// Don't add if the user can't see it.

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if ( ! $notification->display_for_current_user() ) {

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return;

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}

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$notification_id = $notification->get_id();

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$user_id = $notification->get_user_id();

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// Empty notifications are always added.

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if ( $notification_id !== '' ) {

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// If notification ID exists in notifications, don't add again.

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$present_notification = $this->get_notification_by_id( $notification_id, $user_id );

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if ( ! is_null( $present_notification ) ) {

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$this->remove_notification( $present_notification, false );

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}

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if ( is_null( $present_notification ) ) {

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$this->new[] = $notification_id;

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}

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}

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// Add to list.

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$this->notifications[ $user_id ][] = $notification;

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$this->notifications_need_storage = true;

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}

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/**

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* Get the notification by ID and user ID.

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*

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* @param string $notification_id The ID of the notification to search for.

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* @param int|null $user_id The ID of the user.

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*

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* @return Yoast_Notification|null

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*/

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public function get_notification_by_id( $notification_id, $user_id = null ) {

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$user_id = self::get_user_id( $user_id );

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$notifications = $this->get_notifications_for_user( $user_id );

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foreach ( $notifications as $notification ) {

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if ( $notification_id === $notification->get_id() ) {

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return $notification;

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}

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}

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return null;

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}

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/**

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* Display the notifications.

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*

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* @param bool $echo_as_json True when notifications should be printed directly.

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*

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* @return void

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*/

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public function display_notifications( $echo_as_json = false ) {

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// Never display notifications for network admin.

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if ( is_network_admin() ) {

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return;

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}

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$sorted_notifications = $this->get_sorted_notifications();

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$notifications = array_filter( $sorted_notifications, [ $this, 'is_notification_persistent' ] );

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if ( empty( $notifications ) ) {

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return;

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}

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array_walk( $notifications, [ $this, 'remove_notification' ] );

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$notifications = array_unique( $notifications );

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if ( $echo_as_json ) {

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$notification_json = [];

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foreach ( $notifications as $notification ) {

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$notification_json[] = $notification->render();

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}

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// phpcs:ignore WordPress.Security.EscapeOutput -- Reason: WPSEO_Utils::format_json_encode is safe.

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echo WPSEO_Utils::format_json_encode( $notification_json );

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return;

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}

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foreach ( $notifications as $notification ) {

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// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Reason: Temporarily disabled, see: https://github.com/Yoast/wordpress-seo-premium/issues/2510 and https://github.com/Yoast/wordpress-seo-premium/issues/2511.

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echo $notification;

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}

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}

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/**

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* Remove notification after it has been displayed.

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*

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* @param Yoast_Notification $notification Notification to remove.

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* @param bool $resolve Resolve as fixed.

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*

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* @return void

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*/

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public function remove_notification( Yoast_Notification $notification, $resolve = true ) {

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$callback = [ $this, __FUNCTION__ ];

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$args = func_get_args();

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if ( $this->queue_transaction( $callback, $args ) ) {

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return;

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}

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$index = false;

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// ID of the user to show the notification for, defaults to current user id.

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$user_id = $notification->get_user_id();

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$notifications = $this->get_notifications_for_user( $user_id );

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// Match persistent Notifications by ID, non persistent by item in the array.

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if ( $notification->is_persistent() ) {

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foreach ( $notifications as $current_index => $present_notification ) {

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if ( $present_notification->get_id() === $notification->get_id() ) {

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$index = $current_index;

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break;

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}

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}

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}

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else {

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$index = array_search( $notification, $notifications, true );

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}

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if ( $index === false ) {

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return;

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}

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if ( $notification->is_persistent() && $resolve ) {

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++$this->resolved;

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$this->clear_dismissal( $notification );

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}

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unset( $notifications[ $index ] );

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$this->notifications[ $user_id ] = array_values( $notifications );

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$this->notifications_need_storage = true;

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}

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/**

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* Removes a notification by its ID.

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*

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* @param string $notification_id The notification id.

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* @param bool $resolve Resolve as fixed.

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*

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* @return void

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*/

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public function remove_notification_by_id( $notification_id, $resolve = true ) {

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$notification = $this->get_notification_by_id( $notification_id );

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if ( $notification === null ) {

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return;

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}

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$this->remove_notification( $notification, $resolve );

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$this->notifications_need_storage = true;

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}

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/**

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* Get the notification count.

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*

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* @param bool $dismissed Count dismissed notifications.

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*

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* @return int Number of notifications

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*/

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public function get_notification_count( $dismissed = false ) {

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$notifications = $this->get_notifications_for_user( get_current_user_id() );

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$notifications = array_filter( $notifications, [ $this, 'filter_persistent_notifications' ] );

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if ( ! $dismissed ) {

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$notifications = array_filter( $notifications, [ $this, 'filter_dismissed_notifications' ] );

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}

[495] Fix | Delete

[496] Fix | Delete

return count( $notifications );

[497] Fix | Delete

}

[498] Fix | Delete

[499] Fix | Delete