In my WordPress I have a functions.php file containing 1500 lines of code.
Most of this code comes from a program I wrote that connects to an API and sends data from WordPress to it. I am not a WordPress developer, so I do not know if this is possible. Can you make a different file to keep functions.php clean and then include the external file inside the functions.php?
If you are working with a Child Theme but the path of your include route is not found:
Try the following:
include_once( get_stylesheet_directory() .'/xxxx/anyfilename.php');
Check get_stylesheet_directory() to see your child theme path.
Yes you can include the external file in functions.php
require_once( get_template_directory() . 'anyfilename.php' );
You can include external files in functions.php by using either
require_once();
or else you can use
include_once();
The difference between these two is that in the event that the file is not found require will give out a fatal error and then stop executing the rest of the file where as include will only issue a warning but will continue the execution of the file.