How to unserialize data from MySQL

As @Jacob said :

To retrieve your option data :

$your_data = get_option('option_tree');

To save your new data to the option :

$new_data = array(...);
update_option('option_tree', $new_data);

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