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Added an optional 'project:' prefix that can be added to dependencies in a module's .info file to indicate which project the dependency resides in (API addition: https://www.drupal.org/node/2299747).
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Prevented the database API from executing multiple queries at once on MySQL, if the site's PHP version is new enough to do so. This is a secondary defense against SQL injection (API change: https://www.drupal.org/node/2463973).
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Changed the default thousand marker for numeric fields from a space ("1 000") to nothing ("1000") (minor UI change: https://www.drupal.org/node/1388376).
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Made Drupal's code for parsing .info files run much faster and use much less memory.
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Prevented drupal_http_request() from returning an error when it receives a 201 through 206 HTTP status code.
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Added support for autoloading traits via the registry on sites running PHP 5.4 or higher.
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Allowed the user-picture.tpl.php theme template to have HTML classes besides the default "user-picture" class printed in it (markup change).
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Fixed the URL text filter to convert e-mail addresses with plus signs into mailto: links.
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Added alternate text to file icons displayed by the File module, to improve accessibility (string change, and minor API addition to theme_file_icon()).
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Changed one-time login link failure messages to be displayed as errors or warnings as appropriate, rather than as regular status messages (minor UI change and data structure change).
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Changed the default settings.php configuration to exclude private files from the "404_fast_paths" behavior.
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Changed the page that displays filter tips for a particular text format, for example filter/tips/full_html, to return "page not found" or "access denied" if the format does not exist or the user does not have access to it. This change adds a new menu item to the Filter module's hook_menu() entry (minor data structure change).
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Added a new hook, hook_block_cid_parts_alter(), to allow modules to alter the cache keys used for caching a particular block.
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Made drupal_set_message() display and return messages when "0" is passed in as the message to set.
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Fixed non-functional "Files displayed by default" setting on file fields.
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The "worker callback" provided in hook_cron_queue_info() and the "finished" callback specified during batch processing can now be any PHP callable instead of just functions.
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Prevented drupal_set_time_limit() from decreasing the time limit in the case where the PHP maximum execution time is already unlimited.
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Prevented malformed theme .info files (without a "name" key) from causing exceptions during menu rebuilds. If an .info file without a "name" key is found in a module or theme directory, Drupal will now use the module or theme's machine name as the display name instead.
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Made the format column in the {date_format_locale} database table case-sensitive, to match the equivalent column in the {date_formats} table.
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Fixed a bug in the Statistics module that caused JavaScript files attached to a node while it is being viewed to be omitted from the page.
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Fixed various bugs that occurred after hooks were invoked early in the Drupal bootstrap and that caused module_implements() and drupal_alter() to cache an incomplete set of hook implementations for later use.
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Set the X-Content-Type-Options header to "nosniff" when possible, to prevent certain web browsers from picking an unsafe MIME type.
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Fixed a bug in the Drupal 6 to Drupal 7 upgrade path which caused the upgrade to fail when there were multiple file records pointing to the same file.
Drupal是一个开源的内容管理系统(CMS) 平台，它是用PHP写成的。主要用于构造提供多种功能和服务的动态网站，这些功能包括用户管理(UserAdministration)、发布工作流 (Publishing Workflow)、讨论、新闻聚合(NewsAggregation)、元数据(Metadata)操作和用于内容共享的XML发布。Drupal有一 个优秀的模块化结构，提供了许多模块，包括短消息、个性化书签、网站管理、Blog、日记、电子商务、电子出版、留言簿、Job、网上电影院、论坛、投票 等模块。并且Drupal模块的下载、安装、定制非常方便。
