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wp-content/plugins/mailpoet/lib/Config/DeferredAdminNotices.php

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+<?php // phpcs:ignore SlevomatCodingStandard.TypeHints.DeclareStrictTypes.DeclareStrictTypesMissing
+
+namespace MailPoet\Config;
+
+if (!defined('ABSPATH')) exit;
+
+
+use MailPoet\WP\Functions as WPFunctions;
+use MailPoet\WP\Notice;
+
+class DeferredAdminNotices {
+
+  const OPTIONS_KEY_NAME = 'mailpoet_deferred_admin_notices';
+
+  /**
+   * @param string $message
+   */
+  public function addNetworkAdminNotice($message) {
+    $notices = WPFunctions::get()->getOption(DeferredAdminNotices::OPTIONS_KEY_NAME, []);
+    $notices[] = [
+      "message" => $message,
+      "networkAdmin" => true,// if we'll need to display the notice to anyone else
+    ];
+    WPFunctions::get()->updateOption(DeferredAdminNotices::OPTIONS_KEY_NAME, $notices);
+  }
+
+  public function printAndClean() {
+    $notices = WPFunctions::get()->getOption(DeferredAdminNotices::OPTIONS_KEY_NAME, []);
+
+    foreach ($notices as $notice) {
+      $notice = new Notice(Notice::TYPE_WARNING, $notice["message"]);
+      WPFunctions::get()->addAction('network_admin_notices', [$notice, 'displayWPNotice']);
+    }
+
+    if (!empty($notices)) {
+      WPFunctions::get()->deleteOption(DeferredAdminNotices::OPTIONS_KEY_NAME);
+    }
+  }
+}