我知道这可能是有史以来最难做的编码之一，但我想尝试一下。

Im基本上是试图检测通过Wordpress media upload上传的所有（mp3）文件类型，并将其发送到异地，从而通过（ftp连接）将其上传到不同的服务器。

下面是我在数小时的研究后开始编写的代码，我觉得我有点受挫了，老实说，我甚至不知道我是否处于良好状态。我希望对Wordpress/PHP有更多了解的人能帮助我归档我正在做的事情。我这样做是为了避免主服务器因文件大小过大而过载，并将其限制为图像。

我希望上传到服务器B的结构是：serverB。com/music/Year/month/file。mp3

年份和月份应继承自wordpress发布日期（“Y/m”）；

上传后，wordpress中出现的链接应该是serverB的链接。文件的com url。

非常感谢。以下是我启动的代码：

<?php
/* 
 * Change upload directory/server for mp3 files 
 * Only works in WordPress 3.3+
 */

add_filter(\'wp_handle_upload_prefilter\', \'music_pre_upload\');
add_filter(\'wp_handle_upload\', \'music_post_upload\');

function music_pre_upload($file){
add_filter(\'upload_dir\', \'music_remote_upload_dir\');
return $file;
}

function music_post_upload($fileinfo){
remove_filter(\'upload_dir\', \'music_remote_upload_dir\');
return $fileinfo;
}

function music_remote_upload_dir($path){    
$extension = substr(strrchr($_POST[\'name\'],\'.\'),1);
if(!empty($path[\'error\']) ||  $extension != \'mp3\') { return $path; } // if other     filetype send to default uploads folder.

    /**
     * Change this to match your server
     * You only need to change the those with (*)
     * If marked with (-) its optional 
     */

    $post_date = \'/\' . date( \'Y/m\' );

    $settings = array(
            \'host\'          =>        \'host or IP\',       // * the ftp-server hostname
            \'user\'          =>        \'ftp-username\',                // * ftp-user
            \'pass\'          =>        \'ftp-pass\',       // * ftp-password
            \'cdn\'           =>        \'external-server.com\',          // * This have to be a pointed domain or subdomain to the root of the uploads
            \'path\'          =>        \'/music\',                    // - ftp-path, default is root (/). Change here and add the dir on the ftp-server
            \'date\'          =>        $post_date          // Local post date
    );

    /**
     * Host-connection
     * Read about it here: http://php.net/manual/en/function.ftp-connect.php
     */

    if(function_exists(\'ftp_ssl_connect\'))
     {

    $connection = ftp_ssl_connect( $settings[\'host\'] );

     }
        else
     {
    $connection = ftp_connect( $settings[\'host\'] );
     }

    /**
     * Login to ftp
     * Read about it here: http://php.net/manual/en/function.ftp-login.php
     */

    $login = ftp_login( $connection, $settings[\'user\'], $settings[\'pass\'] );

    /**
     * Check ftp-connection
     */

    if ( !$connection || !$login ) {
        die(\'Connection attempt failed, Check your settings\');
    }

   ftp_pasv($resource, true); // To avoid rectify warning

   if( ftp_put( $connection, $settings[\'path\'] . "/" . $settings[\'date\'] . "/" . $file, FTP_BINARY ) ) {

      echo "successfully uploaded $file\\n";

        } else {

      echo "There was a problem while uploading $file\\n";
      }

      // close the connection
       ftp_close($conn_id); 



} // End function