如何从一个文件中读取并写入另一个文件？ [英] How do I read from one file and write to another ?

问题描述

你好，


我对文件处理不是很有经验，所以我是

请求一点帮助。


我有一个名为geotext_1a.csv

的文件，它是一个csv文件，如下所示：


" 2.6.190.56，2.6.190.63，33996344，33996351，G B，英国

" 3.0.0.0" ，" 4.17.135.31"，" 50331648"，" 68257567"，" US" ，美国

4.17.135.32，4.17.135.63，68257568，68257599，CA，加拿大



我想从中获取一些数据，并写一个名为geo_01.txt的文件


，看起来像这样： br />

33996344,33996351，United Kingdom

50331648,68257567，United States

68257568,68257599，Canada



现在我已经编写了一些代码，但我使用

文件函数将内容放入数组中。


由于文件大几兆字节，这导致内存

故障问题。


这就是我所拥有的：

展开 | 选择 | Wrap | 行号

解决方案

代码执行的哪个阶段是您的内存问题？

实际上，当我运行它时，它似乎正在工作，直到它到达

行并且发生这个致命错误：


致命错误：第9行/home/ew78gt/public_html/sys/convert.php中允许的内存大小为16777216字节（试图分配13个字节）

试试这个：

展开 | 选择 | Wrap | 行号

Hello,

I am not very experienced with file handling, so I am
asking for a little help with this.

I have a file called "geotext_1a.csv"
and it is a csv file looking like this:

"2.6.190.56","2.6.190.63","33996344","33996351","G B","United Kingdom"
"3.0.0.0","4.17.135.31","50331648","68257567","US" ,"United States"
"4.17.135.32","4.17.135.63","68257568","68257599", "CA","Canada"


I want to take some data from it and write a file called geo_01.txt

and will look like this :

33996344,33996351,United Kingdom
50331648,68257567,United States
68257568,68257599,Canada


Now I have written some code but I used
the file function to put the contents into an array.

As the file is a few megabytes big, this has caused memory
failure problems.

This is what I have:

Expand|Select|Wrap|Line Numbers

解决方案

Which stage of the code execution is your memory problem occurring at?

Actually, when I run this , its seems to be working until it gets to a
line and this fatal error occurs:

Fatal error: Allowed memory size of 16777216 bytes exhausted (tried to allocate 13 bytes) in /home/ew78gt/public_html/sys/convert.php on line 9

Try this:

Expand|Select|Wrap|Line Numbers

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