Cannot redeclare wp_update_core()

you probably need to reinstall manually the wordpress core with the help of FTP software

  1. download from wordpress.org the latest version of wordpress.
  2. rename or delete the wp-admin and wp-oncludes directories
  3. upload wordpress.

to be fully safe during this process you might want to add a .maintenance file before step 2 and remove it after step 3. this will put your site into maintenance mode for the duration of this operation.

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