Comments on: tail functionality in PHP

By: Peeter tomberg

Peeter tomberg — Tue, 01 Feb 2011 08:20:21 +0000

I’ve written a PHP Tail class using parts of this code. You can view the source here: http://code.google.com/p/php-tail/

By: Marcello Nuccio

Marcello Nuccio — Tue, 12 Oct 2010 08:03:55 +0000

fgets() does not read long lines.
The following version does workaround it:

function read_file($filename, $lines_to_read) {
$text = ”;
$pos = -1;
$handle = fopen($filename, ‘r’);

while ($lines_to_read > 0) {
–$pos;

if(fseek($handle, $pos, SEEK_END) !== 0) {
rewind($handle);
$lines_to_read = 0;
} elseif (fgetc($handle) === “\n”) {
–$lines_to_read;
}

$block_size = (-$pos) % 8192;
if ($block_size === 0 || $lines_to_read === 0) {
$text = fread($handle, ($block_size === 0 ? 8192 : $block_size)) . $text;
}
}

fclose($handle);
return $text;
}

echo read_file(TEXT_FILE, LINES_COUNT);

By: littlebearz

littlebearz — Wed, 25 Aug 2010 00:27:47 +0000

wow, thanks, I was just thinking how I would open the last 10 lines of my 150Mb log file without putting all of them into a buffer and swapping lines

By: Chris

Chris — Sat, 30 Jan 2010 17:05:44 +0000

Nice code, just what I was looking for, thx.

By: Ain Tohvri

Ain Tohvri — Wed, 16 Dec 2009 00:24:29 +0000

It's a splendid idea indeed! Shouldn't be too hard to do either. Subscribe to the RSS, I'll make sure to publish it once I have a spare hour.

By: Adi

Adi — Mon, 14 Dec 2009 18:55:39 +0000

Extremely useful in for the small project I work on. However, if you could update it to use Ajax for example to constantly update the info without reloading the page would be magic. I have searched this on the web for a few hours and tried a few scripts but nothing really works.
Maybe I’ll start from this script to make the update myself….. although I am not an programmer.

Thanks,

By: thesaur

thesaur — Sun, 11 Oct 2009 20:17:58 +0000

Thanks. Quite useful.

By: Ain Tohvri

Ain Tohvri — Thu, 20 Nov 2008 00:18:12 +0000

Absolutely. You are welcome to modify as Fjor has already quite rightly done it.

By: louis w

louis w — Tue, 18 Nov 2008 16:09:05 +0000

You may want to check if the file exists before you try to read it.

By: Fjor

Fjor — Thu, 30 Oct 2008 16:27:34 +0000

Thank you very much. I modified slightly the code for letting the user change the number of lines using a GET variable.