Why doesn't xdebug work in sublime text 3?

Question

xdebug

I need to view the contents of a table in wordpress

$fields = $wpdb->get_results("SHOW fields FROM $wpdb->posts", ARRAY_A);

But I put an end to this line, I run xdebug, but the answer is emptiness. Usually, when there is something in the variable, the browser freezes, a white page, and information is displayed in the editor.
In this example, I can view the contents of the table only through var_dump.
What did I miss in this plugin?
Thanks in advance.