新聞財經娛樂♬資訊 News Economy

I get one simple example csv file such as
1,2,3  
4,5,6
7,8,9
Total 10 bytes for each row
And I write php file and if every line's first cell is > 0 then overwrite the same cell value by 0 , So
if php pass, the output should like this
0,2,3
0,5,6
0,8,9

So I used fopen with "r+" option because read and write within the same file
and use fseek() with negative offset to backward file pointer to the previous row
since every row is just 10 byte and I used -10 in fseek() and Ftell() is also report correct file pointer
But the question fseek()  could not  locate the exact file pointer by the system with the
Warning: fseek() [function.fseek]: stream does not support seeking in www.mydomain.data.php on line

So the output is same as before, so fseek is fail in my php data.php and I also try
rewind() that is also NO any response.

SO anyone know what is the warning meaning ? and I check a lot thing at
http://hk.php.net/manual/en/book.stream.php and
see the stream data method at  http://hk.php.net/manual/en/book.stream.php

write a simple data into csv file why it is so difficult. Please advise.

Duncan

/*******data.php****?<?php/*phpinfo();*/$file_handle = fopen("javascript.csv", "r+");while (!feof($file_handle) ) {echo ftell($file_handle);echo '<br></br>';$line_of_text = fgetcsv($file_handle, 10);echo '<br></br>';if ($line_of_text[0] >0 ) {echo $line_of_text[0].'<br></br>' ;fseek($file_handle, -10, SEEK_SET);$line_of_text[0] =0;fwrite($file_handle, $line_of_text);   }}                                  

1:2:3:4:5:6:7:8:9:10:11:12:13:14:15:16:17:18:

It's always a good idea to read the online man pages and especially the user-contributed notes.  Lots of experts contribute to the PHP web site:
http://us3.php.net/manual/en/function.fseek.php#102994

I wrote before reading your response.

The question was posted in PHP and the answer provided is also PHP. If you want a solution to fseek(), someone  esle will probably have to step in.

The suggested code, as you say, solves your problem, and I have further refined / corrected it for you as there was a flaw (the resutant file would have contained ONLY the amended lines and NO others)