hey, I have a large file and I want to keep the last x row of it. I
figured out how to navigate to the point where I want to extract the
data, but I cant figure out how to extact from the file current $fp and
write out the data to another file.
Think of it like this, when the file gets to be x bytes, get the last 20
lines from it and copy it to another file, so that I could dump the old
and replace it witht the new....
Thanks.
<--snip of example code-->
$fp = fopen("./chat/chat.txt", "r+");
$size = filesize("chat/chat.txt");
$count = 0;
while (!@feof($fp)) {
$lines = fgets($fp, 4096);
$count = $count + 1;
}
$count--; // return the correct # of lines in file
echo "Lines: $count<br>";
$offset = round($count - ($count / 4));
echo "Offset: $offset<br>";
$count = 0;
rewind($fp);
while ($count < $offset) {
$lines = fgets($fp, 4096);
$count = $count + 1;
}
echo "New Offset: $count<br>";
$file = fread($fp);
if (!copy($file, $file.'.bak')) {
print ("failed to copy $file...<br>\n");
}
fclose($fp);
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