您应该设置WP_POST_REVISIONS 到一个固定的数字。如果您不这样做，WordPress将保留无限数量的修订。请参见函数wp_revisions_to_keep():

function wp_revisions_to_keep( $post ) {
    $num = WP_POST_REVISIONS;

    if ( true === $num )
        $num = -1;
    else
        $num = intval( $num );

    if ( ! post_type_supports( $post->post_type, \'revisions\' ) )
        $num = 0;

    return (int) apply_filters( \'wp_revisions_to_keep\', $num, $post );
}

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如果我将WP\\u POST\\u REVISIONS设置为10，这些帖子会发生什么情况？旧版本会自动删除还是保留？

您有以下操作：

add_action( \'pre_post_update\', \'wp_save_post_revision\' );

如果您检查source 属于wp_save_post_revision() 您可以看到，它将删除当前帖子的其余修订：

$delete = count($revisions) - WP_POST_REVISIONS;

以下是来源的相关部分wp_save_post_revision():

// WP_POST_REVISIONS = true (default), -1
if ( !is_numeric( WP_POST_REVISIONS ) || WP_POST_REVISIONS < 0 )
        return $return;

// all revisions and (possibly) one autosave
$revisions = wp_get_post_revisions( $post_id, array( \'order\' => \'ASC\' ) );

// WP_POST_REVISIONS = (int) (# of autosaves to save)
$delete = count($revisions) - WP_POST_REVISIONS;

if ( $delete < 1 )
        return $return;

$revisions = array_slice( $revisions, 0, $delete );

for ( $i = 0; isset($revisions[$i]); $i++ ) {
        if ( false !== strpos( $revisions[$i]->post_name, \'autosave\' ) )
                continue;
        wp_delete_post_revision( $revisions[$i]->ID );
}