Custom Admin Pages in WordPress

Custom admin pages in WordPress are one of those things that aren’t often needed if you’re using something like the Settings API, the add_menu_page function, or a similar API function. And in many, if not most, cases all of the above suffice; however, there are times where you need more control over what’s displayed to the user, how the input is handled once it’s submitted, and then what’s returned to the user after the data has been saved to the database.
In those cases, it’s helpful to know how to write custom admin pages in WordPress and all that comes with it – from sanitization, custom error messages, validation, and page redirection.
Custom Admin Pages in WordPress
In my latest series on Envato’s Tuts+ network, I cover this topic in a four-part series. As it’s described:
The series landing page on Envato.
As it’s described:
It’s possible to write our own custom WordPress administration pages. In this series, we’re going to take a look at how to do exactly that.
It’s simple, sure, but here is a brief rundown of the topics discussed in each of the four parts:
This part aims to answer the question: What
Source: https://managewp.org/articles/13564/custom-admin-pages-in-wordpress

source https://williechiu40.wordpress.com/2016/10/07/custom-admin-pages-in-wordpress/