php踊跃发送文件
php主动发送文件
最近想要做一个东西，用户把文件发送到我自己的服务器后，再把文件发送到另外一个服务器（减轻负担），请问要怎样做？
------解决方案--------------------
称“我自己的服务器”为本地服务器，“另外一个服务器”为目标服务器
取决于目标服务器的环境
1、如果目标服务器上有ftp服务，可通过本地服务器的ftp函数组（非window系统需加载扩展）传递
2、如果目标服务器上有ftp服务，且ftp允许匿名访问，可用file_put_contents函数直接传递
3、无论如何都可以先尝试使用file_put_contents传递，虽然不一定能成功。但若成功了，就简单多了
4、可以使用curl或sock实现文件上传，但需要目标服务器上有接收程序
------解决方案--------------------
Rsync是一个远程数据同步工具，可通过LAN/WAN快速同步多台主机间的文件。
http://blog.csdn.net/chanya/article/details/7891240
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