php接收文件时的一些问题（考虑高并发）
最近在做一个上传大文件的工具，用mfc写的，在php端遇到一些问题，我的思路是这样的，在mfc中切割大文件，然后将小块文件连续http上传到php端，然后php拼接这些文件，不过遇到了一些问题，
1.因为php拼接文件是通过在文件尾追加的形式实现的，因此两个人上传同名文件时，就会产生分不清楚刚上传的文件块是属于谁的尴尬。（个人考虑用锁的形式避免冲突，可是一个人在上传的时候，总不能让另一个等他上传好了再上传吧）
2.如果用户中途关闭了上传共据，产生呢个的临时文件该怎么清理，难道要再写一个驻留程序，专门清理这些垃圾。
求各位大神赐教？
------解决思路----------------------
思路：可以在每个小块文件数据前面加几个标识，标识它们是同一个文件，最好固定长度，可以生成uuid
------解决思路----------------------
碎片文件名要有唯一標識。
例如 格式
uid: 文件唯一id標識
num: 此文件的碎片數量
curr: 當前碎片的序號
uid_num_curr
例如：10000_10_01
------解决思路----------------------
呵呵，楼上的能解决 两个人上传同名文件时，就会产生分不清楚刚上传的文件块是属于谁的尴尬。 的问题吗？显然是不能的！
分块上传和分块下载原理是一样的。数据源方都必须提供一个记录有：文件名、文件长度、每块的次序、标识、长度、验证信息等与检查数据完整性和拼装相关的数据块，通常接收方是以文件形式保存和使用的
而在分块传输的数据块前面也需要加入标识该块的信息，接收方分离出该信息并与信息文件对比无误后，方可组装数据文件
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