You know what, I think Im explaining myself wrong. The word truncate in
itself means I believe to cut at the bottom. This isn't what I need.
Basically, its a chat script and all the newer messages are at the
bottom, and when the file reaches x bytes I want to 'cut off the head'
of the file by x lines. leaving the most current messages at the bottom
alone.
Ive been messing around with truncate all this time getting the wrong
results. Why cant files be as easy as databases.... :)
If any one has a clue please point it to me.
Meantime, back to the manual.....
Thanks
Sterling Hughes wrote:
> On Fri, 7 Sep 2001, Gerard Samuel wrote:
>
>
>>Can a file be truncated from the beginning, and by x amount of lines??
>>Thanks
>>
>>
> Truncated from the beginning? Do you mean truncate the file by X
> lines, starting from the first position in the file, well, yeah:
>
> <?php
> $fp = fopen("filename", "r+");
>
> // Start counting from 0, set to one, if you want to start counting
> // from 1
> $count = 0;
>
> while (!@feof($fp)) {
> // Not used, but unless your line lengths are longer than
> // 4K, this will effectively skip over a line
> $line = fgets($fp, 4096);
>
> if (++$count == $line_number_you_want) {
> ftruncate($fp, ftell($fp));
> }
> }
>
> fclose($fp);
> ?>
>
> Please note the above is devoid of error checking :)
>
> -Sterling
>
>
>
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