Today I want to record a bit of strange requirement: how to use WordPress core function in external PHP file. I think some people may need it in future, because I see the same problem on stackoverflow (https://stackoverflow.com/questions/29791763/use-get-option-in-external-php-file).
Why to do that? It is because I write a external php file, and it can interact with HTML to present an interface; in the process, I need to call the WordPress core methods get_option() and update_option() to complete the function of my page.
The external php file it does not under my plugin or theme directory. If you put it in a theme folder or developing a plugin, the default is to use all WordPress libraries.
So how do we call WordPress core function from external files?
Solution
Taking get_option() and update_option() as an example, we need to read the file wp-load.php through the require_once() function, so that the system knows where to read the two functions and what to do operate.
The wp-load.php file is usually under the WordPress directory. For the general plugin development folder, the following command should be used to read the file:
require_once('../../../wp-load.php');
If the external PHP file is in the same folder as wp-load.php, use:
require_once('../../../wp-load.php');
Simply put, all you have to enter is the path to wp-load.php.
References
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