Retrieve post info within AJAX helper function

Use wp_localize_script() to declare globals.

Example:

wp_localize_script( 'my-ajax-request', 'MyAjax', array( 'ajaxurl' => admin_url( 'admin-ajax.php' ) ) );

You could store your query results there and access them later.

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