Standard Library Changes

• substr() now returns an empty string instead of FALSE when the truncation happens on boundaries.
• call_user_method() and call_user_method_array() no longer exists.
• ob_start() no longer issues an E_ERROR, but instead an E_RECOVERABLE_ERROR in case an output buffer is created in an output buffer handler.
• The internal sorting algorithm has been improved, what may result in different sort order of elements that compare as equal.
• Removed dl() function on fpm-fcgi.
• setcookie() with an empty cookie name now issues an E_WARNING and doesn’t send an empty set-cookie header line anymore.