Wordpress wpdb undefined variable

Question

I'm writing a plugin and trying to request some data from a custom table in my database using:

$current_text = $wpdb->get_results("SELECT text FROM addtext ORDER BY id DESC LIMIT 1");

but just get the error Undefined variable: wpdb

Any idea why this isn't working? I've followed the docs and scoured Google, with no luck. Still pretty new to WP plugins so probably something obvious.

Thanks!

Answer 1

I needed to use global $wpdb; in my function.