Calling flush() when output buffering is enabled causes output to be
duplicated. Besides phpBB enabling output buffering for gzip compression,
output buffering may be enabled externally to phpBB via output_handler
or output_buffering directives in php.ini.
Use ob_get_level to determine whether output buffering is active and
call ob_flush in that case.
PHPBB3-10191
Output buffering may be enabled via various approaches, among them:
* output_buffering in php.ini;
* output_handler in php.ini enables output_buffering;
* ob_start call.
ob_get_level allows us to query php runtime for the actual output buffering
status.
PHPBB3-10188
* develop-olympus:
[ticket/10170] Fix broken recaptcha verification host.
[ticket/10170] Include www in hostname in language strings.
[ticket/10170] Update language entries
[ticket/10170] reCaptcha API has been moved.
* bantu/ticket/10170:
[ticket/10170] Fix broken recaptcha verification host.
[ticket/10170] Include www in hostname in language strings.
[ticket/10170] Update language entries
[ticket/10170] reCaptcha API has been moved.
* develop-olympus:
[ticket/9999] SEARCH_USER_POSTS is also used on viewtopic. Move to common.
[ticket/9999] Remove broken and unused L_FORUM_FOLDER_ALT variable.
L_FORUM_FOLDER_ALT was supposed to be a language variable but the language
variable is never looked up but directly passed as L_FORUM_FOLDER_ALT instead.
Also, the expected functionality is correctly implemented by
FORUM_FOLDER_IMG_ALT.
PHPBB3-9999
* develop: (170 commits)
[ticket/10145] Always recompile all templates when DEBUG_EXTRA is defined.
[feature/attachment-management-no-reassignment] Handle privacy and some more.
[ticket/10148] Turn TEMPLATE_BITFIELD into an instance variable.
[ticket/10147] Corrected a typo in includes/functions_template.php.
[ticket/10141] Save a hash lookup when value is not in cache.
[ticket/10143] Added tests for storing a previously deleted value in db cache.
[ticket/10105] Update AIM express link.
[ticket/10105] Update AIM application download link.
[ticket/10137] Remove unintended space at end of PHP_URL_FOPEN_SUPPORT_EXPLAIN.
[ticket/10141] Split double-assignment into conditional and unconditional part.
[ticket/10141] Use a cache in $auth->_fill_acl() for better performance.
[ticket/9961] Create log entries when users are activated.
[ticket/10139] Make signatures of set_atomic() consistent by using $new_value.
[ticket/10139] Rename $cache to $use_cache to avoid confusion with cache object
[ticket/10006] Remove unneeded if statements
[ticket/10006] Remove return values
[ticket/10006] More testing
[ticket/10006] Tweak the tests a bit
[ticket/10006] Add phpbb_config::delete
[ticket/7941] Added @return to generate_board_url docstring.
...
