$wpdb variable throw this error Call to a member function get_results() on a non-object in

This is a PHP variable scope issue, there is no $wpdb defined in your function.

Add

global $wpdb;

before trying to use the $wpdb object.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)