Dropdown List Won’t Display Selected Option After Submit / Refresh

The name attribute for the select is “r_sortby”.
Replace

$sort= $_GET['sort'];

with

$sort = isset( $_GET['r_sortby'] ) ? $_GET['r_sortby'] : 'date'; 

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