PHP method code example for recording page dwell time

Sometimes when we are doing program development, we want to know how long the user has been browsing the website page, so how to implement this function? This article mainly introduces the method of PHP recording page dwell time, involving PHP combined with js related operation skills for files and time. Friends in need can refer to , the details are as follows:

First add JS to the page to be monitored as follows

<script>
var dt1 = new Date();
window.onbeforeunload = function(){
  var dt2 = new Date();
  var ms = dt2.getTime() - dt1.getTime();
  var img = new Image();
  img.src = &#39;log.php?stay_ms=&#39; + ms;
}
</script>

log.php code is as follows

<?php
$refer = &#39;&#39;;
if (isset($_SERVER[&#39;HTTP_REFERER&#39;]))
{
  $refer = $_SERVER[&#39;HTTP_REFERER&#39;];
}
$user_agent = &#39;&#39;;
if (isset($_SERVER[&#39;HTTP_USER_AGENT&#39;]))
{
  $user_agent = $_SERVER[&#39;HTTP_USER_AGENT&#39;];
}
$ip = $_SERVER[&#39;REMOTE_ADDR&#39;];
if (isset($_GET[&#39;stay_ms&#39;]))
{
  $log = &#39;[&#39; . date("Y-m-d H:i:s") . &#39;] &#39; . $ip . &#39; &#39; . $refer . &#39; @ &#39; . number_format($_GET[&#39;stay_ms&#39;]) . "ms\r\n";
  file_put_contents("log/log_" . date("Y-m-d") . ".txt", $log, FILE_APPEND);
}
if ($_SERVER[&#39;QUERY_STRING&#39;] == &#39;&#39; || isset($_GET[&#39;day&#39;]))
{
  $day = isset($_GET[&#39;day&#39;]) ? $_GET[&#39;day&#39;] : date("Y-m-d");
  $file = "log/log_" .$day . ".txt";
  if (file_exists($file))
  {
    $log = file_get_contents($file);
    echo nl2br($log);
  }
}

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