init

wp-content/plugins/jetpack/modules/subscriptions/class-settings.php

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+<?php
+/**
+ * The Subscriptions settings.
+ *
+ * This is a class that contains helper functions for the Subscriptions settings module.
+ *
+ * @package automattic/jetpack-subscriptions
+ */
+
+namespace Automattic\Jetpack\Modules\Subscriptions;
+
+/**
+ * Class Settings
+ */
+class Settings {
+	/**
+	 * The default reply-to option.
+	 *
+	 * @var string
+	 */
+	public static $default_reply_to = 'comment';
+
+	/**
+	 * Validate the reply-to option.
+	 *
+	 * @param string $reply_to The reply-to option to validate.
+	 * @return bool Whether the reply-to option is valid or not.
+	 */
+	public static function is_valid_reply_to( $reply_to ) {
+		$valid_values = array( 'author', 'no-reply', 'comment' );
+		if ( in_array( $reply_to, $valid_values, true ) ) {
+			return true;
+		}
+		return false;
+	}
+}