file.php not loaded?

OK, so there’s a bunch of admin functions in wp-admin/includes. These are loaded at some point between the loading of the theme’s functions.php and the admin_init hook. But that are ONLY loaded for admin-side pages. They are not loaded for front-end pages or AJAX calls.

If you want to use these functions in front-end pages of AJAX calls then you need to do:

require_once( ABSPATH . 'wp-admin/admin-functions.php' );

I would suggest using this sparingly as it will, inevitably, slow your site down.

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