Updated tailLog.php file

tailLog.php

<?php
/* Pi-hole: A black hole for Internet advertisements
*  (c) 2017 Pi-hole, LLC (https://pi-hole.net)
*  Network-wide ad blocking via your own hardware.
*
*  This file is copyright under the latest version of the EUPL.
*  Please see LICENSE file for your rights under this license. */

require "password.php";
if(!$auth) die("Not authorized");

// Not using SplFileObject here, since direct
// usage of f-streams will be much faster for
// files as large as the pihole.log
if(isset($_GET["FTL"]))
{
        $file = fopen("/var/log/pihole-FTL.log","r");
        $myfiletype = filetype("/var/log/pihole-FTL.log");
}
else
{
        $file = fopen("/var/log/pihole.log","r");
        $myfiletype = filetype("/var/log/pihole.log");
}

if(!$file)
{
        die(json_encode(array("offset" => 0, "lines" => array("Failed to open log file. Check permissions!\n"))));
}
if(isset($_GET["offset"]))
{
        $offset = intval($_GET['offset']);
        if($offset > 0 && $myfiletype != "fifo")
        {
                // Seeks on the file pointer where we want to continue reading is known
                fseek($file, $offset);
                $lines = [];
                while (!feof($file))
                        array_push($lines, htmlspecialchars(fgets($file)));
                die(json_encode(array("offset" => ftell($file), "lines" => $lines)));
        } elseif ( $myfiletype == "fifo" )
        {
                stream_set_blocking($file, false);
                $lines = preg_split("/(.+\n)/", htmlspecialchars(stream_get_contents($file)),-1, PREG_SPLIT_DELIM_CAPTURE);
                die(json_encode(array("offset" => count($lines), "lines" => $lines)));
        }
}
// Locate the current position of the file read/write pointer
fseek($file, -1, SEEK_END);
// Add one to skip the very last "\n" in the log file
die(json_encode(array("offset" => ftell($file)+1)));

?>