When WordPress upgrades plugins and themes, it will enable maintenance mode to prevent website modifications during the update. But, in some cases, this maintenance mode will not get disabled after the upgrade, and your website will be unaccessible. What can you do?
WordPress WP_Query class is used to get posts for, basically, everything. And this class is very, very complicated. It has a long list of supported query variables, filters and actions to control the process. But, even with all that, there are some limitations in conventional methods of use.
This is basic operation in WordPress, but it’s not as straightforward as you might think. For that, you will usually use get_posts() function that allows you to set category, but this function can use many more options than actually documented, you can use all WP Query arguments with it.
When you create a complex form that will be used on page or anywhere in WordPress, there are some restrictions that you will not found documented, and will cause you a lot of problems if you are not aware of them and how to solve them.