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Re: Going back to a previous line in a CSV file [message #170176 is a reply to message #170147]

Sat, 16 October 2010 17:52

Thomas 'PointedEars'
Messages: 701
Registered: October 2010

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Senior Member

pereges wrote:

> I guess what I'm trying to do here is move back and forth between the
> file which is so much more difficult with flat files.

It is rather easy to do (as long as you are not changing anything) if in the
first pass you store in an array for each line the byte offset that ftell()
tells you, to which you can then fseek() (I am currently doing this to
continue processing a large CSV file after a PHP/DB connection timeout).

Contrary to what Michael Fesser said, this is rather independent of the line
length (RTFM on fgets() and fgetcsv() for details.) There might even be a
built-in or PEAR class for dealing with flat files.

> I've even considering dumping this CSV data in a mysql table and then
> I can process the data easily with query statements.

You could load all the data into an array and work with that probably even
more easily. Look into array_filter(), for example.

PointedEars
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[Message index]

		Going back to a previous line in a CSV file By: pereges on Tue, 12 October 2010 18:50
		Re: Going back to a previous line in a CSV file By: Luuk on Tue, 12 October 2010 19:09
		Re: Going back to a previous line in a CSV file By: Michael Fesser on Tue, 12 October 2010 19:20
		Re: Going back to a previous line in a CSV file By: pereges on Tue, 12 October 2010 20:07
		Re: Going back to a previous line in a CSV file By: pereges on Tue, 12 October 2010 20:12
		Re: Going back to a previous line in a CSV file By: Luuk on Tue, 12 October 2010 20:17
		Re: Going back to a previous line in a CSV file By: Thomas 'PointedEars' on Sat, 16 October 2010 17:52
		Re: Going back to a previous line in a CSV file By: Michael Fesser on Tue, 12 October 2010 20:41
		Re: Going back to a previous line in a CSV file By: aaaa on Wed, 13 October 2010 13:39

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