wp_throttle_comment_flood()

wp_throttle_comment_flood( bool $block, int $time_lastcomment, int $time_newcomment ): bool

function wp_throttle_comment_flood( $block, $time_lastcomment, $time_newcomment ) {
	if ( $block ) { // A plugin has already blocked... we'll let that decision stand.
		return $block;
	}
	if ( ( $time_newcomment - $time_lastcomment ) < 15 ) {
		return true;
	}
	return false;
}