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function wp_update_user( $userdata ) {
	if ( $userdata instanceof stdClass ) {
		$userdata = get_object_vars( $userdata );
	} elseif ( $userdata instanceof WP_User ) {
		$userdata = $userdata->to_array();
	}

	$userdata_raw = $userdata;

	$user_id = isset( $userdata['ID'] ) ? (int) $userdata['ID'] : 0;
	if ( ! $user_id ) {
		return new WP_Error( 'invalid_user_id', __( 'Invalid user ID.' ) );
	}

	// First, get all of the original fields.
	$user_obj = get_userdata( $user_id );
	if ( ! $user_obj ) {
		return new WP_Error( 'invalid_user_id', __( 'Invalid user ID.' ) );
	}

	$user = $user_obj->to_array();

	// Add additional custom fields.
	foreach ( _get_additional_user_keys( $user_obj ) as $key ) {
		$user[ $key ] = get_user_meta( $user_id, $key, true );
	}

	// Escape data pulled from DB.
	$user = add_magic_quotes( $user );

	if ( ! empty( $userdata['user_pass'] ) && $userdata['user_pass'] !== $user_obj->user_pass ) {
		// If password is changing, hash it now.
		$plaintext_pass        = $userdata['user_pass'];
		$userdata['user_pass'] = wp_hash_password( $userdata['user_pass'] );

		/**
		 * Filters whether to send the password change email.
		 *
		 * @since 4.3.0
		 *
		 * @see wp_insert_user() For `$user` and `$userdata` fields.
		 *
		 * @param bool  $send     Whether to send the email.
		 * @param array $user     The original user array.
		 * @param array $userdata The updated user array.
		 */
		$send_password_change_email = apply_filters( 'send_password_change_email', true, $user, $userdata );
	}

	if ( isset( $userdata['user_email'] ) && $user['user_email'] !== $userdata['user_email'] ) {
		/**
		 * Filters whether to send the email change email.
		 *
		 * @since 4.3.0
		 *
		 * @see wp_insert_user() For `$user` and `$userdata` fields.
		 *
		 * @param bool  $send     Whether to send the email.
		 * @param array $user     The original user array.
		 * @param array $userdata The updated user array.
		 */
		$send_email_change_email = apply_filters( 'send_email_change_email', true, $user, $userdata );
	}

	clean_user_cache( $user_obj );

	// Merge old and new fields with new fields overwriting old ones.
	$userdata = array_merge( $user, $userdata );
	$user_id  = wp_insert_user( $userdata );

	if ( is_wp_error( $user_id ) ) {
		return $user_id;
	}

	$blog_name = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );

	$switched_locale = false;
	if ( ! empty( $send_password_change_email ) || ! empty( $send_email_change_email ) ) {
		$switched_locale = switch_to_user_locale( $user_id );
	}

	if ( ! empty( $send_password_change_email ) ) {
		/* translators: Do not translate USERNAME, ADMIN_EMAIL, EMAIL, SITENAME, SITEURL: those are placeholders. */
		$pass_change_text = __(
			'Hi ###USERNAME###,

This notice confirms that your password was changed on ###SITENAME###.

If you did not change your password, please contact the Site Administrator at
###ADMIN_EMAIL###

This email has been sent to ###EMAIL###

Regards,
All at ###SITENAME###
###SITEURL###'
		);

		$pass_change_email = array(
			'to'      => $user['user_email'],
			/* translators: Password change notification email subject. %s: Site title. */
			'subject' => __( '[%s] Password Changed' ),
			'message' => $pass_change_text,
			'headers' => '',
		);

		/**
		 * Filters the contents of the email sent when the user's password is changed.
		 *
		 * @since 4.3.0
		 *
		 * @param array $pass_change_email {
		 *     Used to build wp_mail().
		 *
		 *     @type string $to      The intended recipients. Add emails in a comma separated string.
		 *     @type string $subject The subject of the email.
		 *     @type string $message The content of the email.
		 *         The following strings have a special meaning and will get replaced dynamically:
		 *         - ###USERNAME###    The current user's username.
		 *         - ###ADMIN_EMAIL### The admin email in case this was unexpected.
		 *         - ###EMAIL###       The user's email address.
		 *         - ###SITENAME###    The name of the site.
		 *         - ###SITEURL###     The URL to the site.
		 *     @type string $headers Headers. Add headers in a newline (\r\n) separated string.
		 * }
		 * @param array $user     The original user array.
		 * @param array $userdata The updated user array.
		 */
		$pass_change_email = apply_filters( 'password_change_email', $pass_change_email, $user, $userdata );

		$pass_change_email['message'] = str_replace( '###USERNAME###', $user['user_login'], $pass_change_email['message'] );
		$pass_change_email['message'] = str_replace( '###ADMIN_EMAIL###', get_option( 'admin_email' ), $pass_change_email['message'] );
		$pass_change_email['message'] = str_replace( '###EMAIL###', $user['user_email'], $pass_change_email['message'] );
		$pass_change_email['message'] = str_replace( '###SITENAME###', $blog_name, $pass_change_email['message'] );
		$pass_change_email['message'] = str_replace( '###SITEURL###', home_url(), $pass_change_email['message'] );

		wp_mail( $pass_change_email['to'], sprintf( $pass_change_email['subject'], $blog_name ), $pass_change_email['message'], $pass_change_email['headers'] );
	}

	if ( ! empty( $send_email_change_email ) ) {
		/* translators: Do not translate USERNAME, ADMIN_EMAIL, NEW_EMAIL, EMAIL, SITENAME, SITEURL: those are placeholders. */
		$email_change_text = __(
			'Hi ###USERNAME###,

This notice confirms that your email address on ###SITENAME### was changed to ###NEW_EMAIL###.

If you did not change your email, please contact the Site Administrator at
###ADMIN_EMAIL###

This email has been sent to ###EMAIL###

Regards,
All at ###SITENAME###
###SITEURL###'
		);

		$email_change_email = array(
			'to'      => $user['user_email'],
			/* translators: Email change notification email subject. %s: Site title. */
			'subject' => __( '[%s] Email Changed' ),
			'message' => $email_change_text,
			'headers' => '',
		);

		/**
		 * Filters the contents of the email sent when the user's email is changed.
		 *
		 * @since 4.3.0
		 *
		 * @param array $email_change_email {
		 *     Used to build wp_mail().
		 *
		 *     @type string $to      The intended recipients.
		 *     @type string $subject The subject of the email.
		 *     @type string $message The content of the email.
		 *         The following strings have a special meaning and will get replaced dynamically:
		 *         - ###USERNAME###    The current user's username.
		 *         - ###ADMIN_EMAIL### The admin email in case this was unexpected.
		 *         - ###NEW_EMAIL###   The new email address.
		 *         - ###EMAIL###       The old email address.
		 *         - ###SITENAME###    The name of the site.
		 *         - ###SITEURL###     The URL to the site.
		 *     @type string $headers Headers.
		 * }
		 * @param array $user     The original user array.
		 * @param array $userdata The updated user array.
		 */
		$email_change_email = apply_filters( 'email_change_email', $email_change_email, $user, $userdata );

		$email_change_email['message'] = str_replace( '###USERNAME###', $user['user_login'], $email_change_email['message'] );
		$email_change_email['message'] = str_replace( '###ADMIN_EMAIL###', get_option( 'admin_email' ), $email_change_email['message'] );
		$email_change_email['message'] = str_replace( '###NEW_EMAIL###', $userdata['user_email'], $email_change_email['message'] );
		$email_change_email['message'] = str_replace( '###EMAIL###', $user['user_email'], $email_change_email['message'] );
		$email_change_email['message'] = str_replace( '###SITENAME###', $blog_name, $email_change_email['message'] );
		$email_change_email['message'] = str_replace( '###SITEURL###', home_url(), $email_change_email['message'] );

		wp_mail( $email_change_email['to'], sprintf( $email_change_email['subject'], $blog_name ), $email_change_email['message'], $email_change_email['headers'] );
	}

	if ( $switched_locale ) {
		restore_previous_locale();
	}

	// Update the cookies if the password changed.
	$current_user = wp_get_current_user();
	if ( $current_user->ID === $user_id ) {
		if ( isset( $plaintext_pass ) ) {
			wp_clear_auth_cookie();

			/*
			 * Here we calculate the expiration length of the current auth cookie and compare it to the default expiration.
			 * If it's greater than this, then we know the user checked 'Remember Me' when they logged in.
			 */
			$logged_in_cookie = wp_parse_auth_cookie( '', 'logged_in' );
			/** This filter is documented in wp-includes/pluggable.php */
			$default_cookie_life = apply_filters( 'auth_cookie_expiration', ( 2 * DAY_IN_SECONDS ), $user_id, false );

			$remember = false;

			if ( false !== $logged_in_cookie && ( $logged_in_cookie['expiration'] - time() ) > $default_cookie_life ) {
				$remember = true;
			}

			wp_set_auth_cookie( $user_id, $remember );
		}
	}

	/**
	 * Fires after the user has been updated and emails have been sent.
	 *
	 * @since 6.3.0
	 *
	 * @param int   $user_id      The ID of the user that was just updated.
	 * @param array $userdata     The array of user data that was updated.
	 * @param array $userdata_raw The unedited array of user data that was updated.
	 */
	do_action( 'wp_update_user', $user_id, $userdata, $userdata_raw );

	return $user_id;
}