get the correct url for an folder in wp-includes wordpress

Question

I have added a folder (json) to wp-includes with a file inside called users.json. I am trying to write to this file but am getting the following error:

failed to open stream: HTTP wrapper does not support writeable connections

I have been referencing it like the following in my php:

$file = "http://www.fakeurl.com/wp-content/json/users.json";

I believe I need to reference as per the name on the server. Is there a built in way to get this in wordpress?

Something like <?php echo get_template_directory_uri(); ?>

Answer 1

You sad you put the json in wp-includes, but in the url you wrote wp-content. So I give you the code for getting the server path for both folders:

// wp-includes
$file = ABSPATH . WPINC . '/json/users.json';

// wp-content
$file = WP_CONTENT_DIR . '/json/users.json';

You can find many WordPress constants (like ABSPATH, WPINCand WP_CONTENT_DIR on http://wpengineer.com/2382/wordpress-constants-overview/