Each version of Pressflow is API-compatible with the same major Drupal version. For example, Pressflow 6 is compatible with all Drupal 6 modules. Pressflow 6 also integrates the SimpleTest system from Drupal 7 and the CDN support patch.
D6 naively assumed that all elements int he $form_state['values'] array are blocks. PHP 5.5+ throw a warning. This skips over those non array based elements in the loop.
D6 naively assumed that all elements int he $form_state['values'] array are blocks. PHP 5.5+ throw a warning. This skips over those non array based elements in the loop.
Drupal issue upstream closed because of EOL: https://www.drupal.org/node/1680614