Submit button returns to index page instead of sending data

Put var_dump($_SERVER['PHP_SELF']); at the top of header.php and you will see the problem. That always points to index.php because nearly everything loads through index.php.

Use get_permalink to get the “apparent” URL and use that instead of $_SERVER['PHP_SELF'] in the form action attribute.

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