Backtracking through a directory.

[Win]

I was wondering if there was a way to backtrack through a directory.
Let's say that we "readdir'd" our way through the directory to the end
and now would like to back up 3 files to read the third from the last.

Is there an easy way to do this or would I have to find the total
number of directory entries and then calculate exactly how many reads
it takes before getting to the desired location?

Any input would be appreciated.

<?php
$dir = '../zone16/misc';
if ( is_dir($dir) && ($dh = opendir($dir)) )
{
while ( ($file = readdir($dh)) !== false )
{
print $file.'<br>';
}
if ( ($file = readdir($dh)) == false )
{
[!!!back up 3 files and read the third to last file!!!]
}
}
?>

[Oli Filth]

Re: Backtracking through a directory.

Win wrote:[color=blue]
> I was wondering if there was a way to backtrack through a directory.
> Let's say that we "readdir'd" our way through the directory to the end
> and now would like to back up 3 files to read the third from the last.
>
> Is there an easy way to do this or would I have to find the total
> number of directory entries and then calculate exactly how many reads
> it takes before getting to the desired location?[/color]

Either that, or store the result of the successive readdir()s in an
array.

[Win]

Re: Backtracking through a directory.

Thanks for the input, Oli. :-)

[Chung Leong]

Re: Backtracking through a directory.

The easiest way to work with file listing is glob().

http://www.php.net/glob/