断点续传
哪位好心的高手帮忙告诉下怎么判断一个文件是否为断点续传的文件，判断文件名是否存在好像不靠谱吧。要是客户端那边上传的文件文件名一样但文件不一样？？？有更好的方法么？？ 帮忙写下if语句好么 本人很菜 谢谢
------解决方案--------------------
通过这个变量$_SERVER['HTTP_RANGE']取得用户请求的文件的range，然后程序去控制文件的输出。比如第一次请求一个文件的从0到999字节，第二次请求1000到1999字节，以此类推，每次请求1000字节的内容，然后程序通过fseek函数去取得对应的文件位置，然后输出。
PHP实现文件下载断点续传
------解决方案--------------------
你无法自主判断
但你可以在第一次收到上传的片断时返回一个唯一识别标志，让续传客户端发回
------解决方案--------------------
文件名一样，文件大小不一样，你可以获取文件名称，文件大小，类型作为条件，
通过$_SERVER['HTTP-RANGE']来取得客户端请求续传作为标示。
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