© / Posted in 知识如海 / June 22, 2009
WordPress从2.6版本开始，就加入了一个历史记录的功能，弄得在WordPress里发一篇文章时往往伴随着一大堆修订版。这只是对于多用户的Blog才有用，对于大多数个人用户来说，那些历史修订版是大量的垃圾数据，必然会影响到数据库的查询效率，浪费存储空间。
禁用 WordPress 文章修订功能的方法也有几种，网上流行的方法是：
在 wp-config.php 中添加以下代码：
define('WP_POST_REVISIONS', false);
关于 WP_POST_REVISIONS 这个变量的详细设置为：
true（默认）或者 -1：保存所有修订版本
false 或者 0：不保存任何版本（除了自动保存的版本）
大于 0 的整数 n：保存 n 个修订版本（+1 只保存自动保存版本），旧的版本将被删除。
另外，在 wp-settings.php 中，搜索 WP_POST_REVISIONS 可以看到这里的预定义，把：
$default_constants = array( 'WP_POST_REVISIONS' => true );
修改为：
$default_constants = array( 'WP_POST_REVISIONS' => false );
还是建议在 wp-config.php 增加代码来完成，毕竟升级博客后，wp-config.php 是不会被替换的。
参阅官方的说明：Revision Management
如果你觉得添加代码很麻烦的话，可以使用现成的插件来处理，比如：
super-switch - No Revisions - Revision Control
像 Delete-Revision 插件的作者和前阵子在网上看到一位博友的文章中有提到在 wp-config.php 中增加的代码并不能很好的终结文章修订功能，提出了另一种修改方法，既屏蔽了 WordPress 文章修订功能，同时保留了自动保存功能。摘录如下：
WordPress之所以能生成修订版，是因为在更新一篇文章之前，先执行了挂在“pre_post_update”钩子上的函数。在wp-includes/default-filters.php中，可以看到这一行：
add_action( 'pre_post_update', 'wp_save_post_revision' );
这样每次修改都会自动调用wp_save_post_revision这个函数来创建修订版记录。我需要做的就是把这一行注释掉，这样就不会在Update后生成修订版了。
但仅仅改了这一行还不行，经过我的测试，有一种情况仍然会产生修订版。那就是在修改已经发布的文章时，自动保存功能会产生新的修订版。为此，我通过分析自动保存的实现过程，确定了要修改的地方。在wp-admin/includes/post.php文件中，找到wp_create_post_autosave函数（大约在1030行附近）。通过阅读代码和注释，可以知道如果正在编辑的文章还没有自动保存过，就会创建一个修订版。为了让它仅仅起到保存的作用，需要将最后一行的
return _wp_put_post_revision( $_POST, true );
改成：
return edit_post();
整个函数如下：
function wp_create_post_autosave( $post_id ) { $translated = _wp_translate_postdata( true ); if ( is_wp_error( $translated ) ) return $translated; // Only store one autosave. If there is already an autosave, overwrite it. if ( $old_autosave = wp_get_post_autosave( $post_id ) ) { $new_autosave = _wp_post_revision_fields( $_POST, true ); $new_autosave['ID'] = $old_autosave->ID; return wp_update_post( $new_autosave ); } // Otherwise create the new autosave as a special post revision // return _wp_put_post_revision( $_POST, true ); return edit_post(); }
通过修改这两行代码，即保留了自动保存功能，又去掉了历史记录功能，另一个额外的好处是可以让文章ID连续增长。唯一不好的是需要修改源代码，这样在升级WordPress以后又要重新做一次。
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