修改WordPress博客默认的文件上传目录

WordPress 的上传目录默认为 wp-content/uploads/sites/2，怎样自定义上传目录呢？下面的代码展示了在任何情况下，包括wordpress 地址和站点地址不同的情况下，将所有文件上传至站点根目录下的 uploads 文件夹。

在主题的 functions.php 中添加如下内容：

function custom_upload_dir($uploads) {
 $subdir = '';
 if ( get_option( 'uploads_use_yearmonth_folders' ) ) {
 // Generate the yearly and monthly dirs
 if ( !$time ) $time = current_time( 'mysql' );
 $y = substr( $time, 0, 4 );
 $m = substr( $time, 5, 2 );
 $subdir = "/$y/$m";
 }
 $uploads['basedir'] = $_SERVER['DOCUMENT_ROOT'] . '/uploads';
 $uploads['baseurl'] = 'http://'. $_SERVER['SERVER_NAME'] . '/uploads';
 $uploads['path'] = $uploads['basedir'] . $subdir;
 $uploads['url'] = $uploads['baseurl'] . $subdir;
 $uploads['error'] = false;
 return $uploads;
}
add_filter('upload_dir', 'custom_upload_dir');

注意：此更改会影响之前上传的内容！建议在建站初期就设置好。