How to pull echo php in the background to html?

Question

linux

It turns out there is a php script
for (;;)
{
// looped loop
}

I want to execute this script in the background, and watch echo through the browser

I look towards pi.hole
https://github.com/pi-hole/AdminLTE/blob/master /ta...
https://github.com/pi-hole/AdminLTE/blob/master/sc...
https://github.com/pi-hole/AdminLTE/blob/master/sc...

given the code reads the file in /var
/var <- what memory area is this? I do not rummage much, I hope the RAM?

/var/log/pihole.log

Or is there an analogue of php connection without writing a file and immediately reading from the executable php script?

Answer 1

HTML

<?PHP

    // Create cache busting version
    $cacheVer = filemtime(__FILE__);
  
?>

<script src="jquery.min.js?v=<?=$cacheVer?>"></script>

<input type="checkbox" checked id="chk1">
<input type="checkbox" checked id="chk2">
<pre id="output" style="width: 100%; height: 100%; max-height:650px; overflow-y:scroll;"></pre>

<script src="taillog.js?v=<?=$cacheVer?>"></script>

taillog.js

/* 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. */

var offset,
  timer,
  pre,
  scrolling = true;

// Check every 200msec for fresh data
var interval = 200;

// Function that asks the API for new data
function reloadData() {
  clearTimeout(timer);
  $.getJSON("tailLog.php?offset=" + offset, function (data) {
    pre.append(data.lines);

    if (scrolling && offset !== data.offset) {
      pre.scrollTop(pre[0].scrollHeight);
    }

    offset = data.offset;
  });

  timer = setTimeout(reloadData, interval);
}

$(function () {
  // Get offset at first loading of page
  $.getJSON("tailLog.php", function (data) {
    offset = data.offset;
  });
  pre = $("#output");
  // Trigger function that looks for new data
  reloadData();
});

$("#chk1").click(function () {
  $("#chk2").prop("checked", this.checked);
  scrolling = this.checked;
});
$("#chk2").click(function () {
  $("#chk1").prop("checked", this.checked);
  scrolling = this.checked;
});

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. */


// 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('A:\php\batch\log.txt',"r");
}
else
{
  $file = fopen('A:\php\batch\log.txt',"r");
}

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($offset > 0)
  {
    // Seeks on the file pointer where we want to continue reading is known
    fseek($file, $offset);
    $lines = [];
    while (!feof($file))
      array_push($lines, htmlspecialchars(fgets($file)));
    die(json_encode(array("offset" => ftell($file), "lines" => $lines)));
  }
}

// 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)));

?>