去重复
有一文件里有十几万行数据。。。如何去重复。。。大小写一样的只能算一个。。
回复讨论(解决方案)
行的概念是？
如果100字符/行，20万行也就20～60M而已
file 读进来
array_unique
然后写回去
如果觉得空间不够
就逐行读取求MD5并保存（如果平均行长小于32，占的内存还多些）
同时写入文件
遇到某行的MD5已存在了，这行就不写了
文件结构怎么样？贴一段出来，估计斑竹可以帮你解决。
感觉这玩意不用php，用linux的shell工具会更快
例如
cat file | sort -u > file
如果你还要考虑大小写的问题的话，直接在上面的命令加 -f 既忽略大小写
cat file | sort -u -f > file
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