PHP - Find Out Which Files Are Called

This might be more than just a php question but here goes anyways. 

I have designed a php chat room page on my home Apache server just for a few friends & family. The problem I have is the only way for me to know if anyone is on the chat room page is if I'm actually viewing the php page. Is there a way that I can have the page alert me when someone accesses it? I was thinking something like activating  a popup in my browser or even a beep so as long as I'm at my computer with my browser open that I will know someone has accessed the page.       

$filepath = $_SERVER['DOCUMENT_ROOT'] . "file/";
$fileunzippath = $filepath."unzipped/";
$exclude_list = array(".", "..", "...", "index.php", ".php", ".htaccess");
if($_FILES["zip_file"]["name"]) {
	$filename = $_FILES["zip_file"]["name"];
	$source = $_FILES["zip_file"]["tmp_name"];
	$type = $_FILES["zip_file"]["type"];
	
	$name = explode(".", $filename);
	$accepted_types = array('application/zip', 'application/x-zip-compressed', 'multipart/x-zip', 'application/x-compressed');
	foreach($accepted_types as $mime_type) {
		if($mime_type == $type) {
			$okay = true;
			break;
		} 
	}
	
	$continue = strtolower($name[1]) == 'zip' ? true : false;
	if(!$continue) {
		$message = "The file you are trying to upload is not a .zip file. Please try again.";
	}
	$string = preg_replace(array('/\s/', '/\.[\.]+/', '/[^\w_\.\-]/'), array('_', '.', ''), $filename);
    $clean_name = strtr($string, array('Š' => 'S','Ž' => 'Z','š' => 's','ž' => 'z','Ÿ' => 'Y','À' => 'A','Á' => 'A','Â' => 'A','Ã' => 'A','Ä' => 'A','Å' => 'A','Ç' => 'C','È' => 'E','É' => 'E','Ê' => 'E','Ë' => 'E','Ì' => 'I','Í' => 'I','Î' => 'I','Ï' => 'I','Ñ' => 'N','Ò' => 'O','Ó' => 'O','Ô' => 'O','Õ' => 'O','Ö' => 'O','Ø' => 'O','Ù' => 'U','Ú' => 'U','Û' => 'U','Ü' => 'U','Ý' => 'Y','à' => 'a','á' => 'a','â' => 'a','ã' => 'a','ä' => 'a','å' => 'a','ç' => 'c','è' => 'e','é' => 'e','ê' => 'e','ë' => 'e','ì' => 'i','í' => 'i','î' => 'i','ï' => 'i','ñ' => 'n','ò' => 'o','ó' => 'o','ô' => 'o','õ' => 'o','ö' => 'o','ø' => 'o','ù' => 'u','ú' => 'u','û' => 'u','ü' => 'u','ý' => 'y','ÿ' => 'y'));
$clean_name = strtr($clean_name, array('Þ' => 'TH', 'þ' => 'th', 'Ð' => 'DH', 'ð' => 'dh', 'ß' => 'ss', 'Œ' => 'OE', 'œ' => 'oe', 'Æ' => 'AE', 'æ' => 'ae', 'µ' => 'u'));

$clean_name = preg_replace(array('/\s/', '/\.[\.]+/', '/[^\w_\.\-]/'), array('_', '.', ''), $clean_name);
	$target_path = $filepath.$clean_name;  // change this to the correct site path
	if(move_uploaded_file($source, $target_path)) {
		echo "Source: ".$source."<br/>";
		echo "Type: ".$type."<br/>";
		echo "Filename: ".$filename."<br/>";
		
		$zip = new ZipArchive();
		$x = $zip->open($target_path);
		if ($x === true) {
			$zip->extractTo($fileunzippath.$clean_name); // change this to the correct site path
			$zip->close();
			
  $exclude_list;
  $dir_path = $_SERVER['DOCUMENT_ROOT'];
  $dir_path .= "/file/unzipped/";
  $directories = array_diff(scandir($fileunzippath.$clean_name), $exclude_list);
  foreach($directories as $entry) {
    if(is_dir($dir_path.$entry)) {
		if($entry != 'part0' || $entry !='part1')
		{
			 rmdir($entry);
		}
    }
  }
		}
		$message = "Your .zip file was uploaded and unpacked.";
	} else {	
		$message = "There was a problem with the upload. Please try again.";
	}
}

$exclude_list;
  $dir_path = $_SERVER['DOCUMENT_ROOT'];
  $dir_path .= "/file/unzipped/";
  $directories = array_diff(scandir($fileunzippath.$clean_name), $exclude_list);
  foreach($directories as $entry) {
    if(is_dir($dir_path.$entry)) {
		if($entry != 'part0' || $entry !='part1')
		{
			 rmdir($entry);
		}
    }
  }

array:
[SomePath/test.php] = "All In this php file is being read by a new smart function!";
[SomePath/Weird/hello.txt = "Hello world. This is me and im just trying to get some help!";

So far I have managed to create an upload process which uploads a picture, updates the database on file location and then tries to upload the db a 2nd time to update the Thumbnails file location (i tried updating the thumbnails location in one go and for some reason this causes failure)

But the main problem is that it doesn't upload some files

Here is my upload.php

<?php
include 'dbconnect.php';

$statusMsg = '';

$Title = $conn -> real_escape_string($_POST['Title']) ; 
$BodyText = $conn -> real_escape_string($_POST['ThreadBody']) ; 
	 

// File upload path
$targetDir = "upload/";
$fileName = basename($_FILES["file"]["name"]);
$targetFilePath = $targetDir . $fileName;
$fileType = pathinfo($targetFilePath,PATHINFO_EXTENSION);
$Thumbnail = "upload/Thumbnails/'$fileName'";

if(isset($_POST["submit"]) && !empty($_FILES["file"]["name"])){
    // Allow certain file formats
    $allowTypes = array('jpg','png','jpeg','gif','pdf', "webm", "mp4");
    if(in_array($fileType, $allowTypes)){

        // Upload file to server
        if(move_uploaded_file($_FILES["file"]["tmp_name"], $targetFilePath)){

            // Insert image file name into database
            $insert = $conn->query("INSERT into Threads (Title, ThreadBody, filename) VALUES ('$Title', '$BodyText', '$fileName')");
            if($insert){
               $statusMsg = "The file ".$fileName. " has been uploaded successfully."; 

		$targetFilePathArg = escapeshellarg($targetFilePath);
		$output=null;
		$retval=null;
		 //exec("convert $targetFilePathArg -resize 300x200 ./upload/Thumbnails/'$fileName'", $output, $retval);
		 exec("convert $targetFilePathArg -resize 200x200 $Thumbnail", $output, $retval);
		echo "REturned with status $retval and output:\n" ; 
		if ($retval == null) { 
		echo "Retval is null\n" ;
		echo "Thumbnail equals $Thumbnail\n" ; 
		}

            }else{
                $statusMsg = "File upload failed, please try again.";
            } 
        }else{
            $statusMsg = "Sorry, there was an error uploading your file.";
        }
    }else{
        $statusMsg = 'Sorry, only JPG, JPEG, PNG, GIF, mp4, webm & PDF files are allowed to upload.';
    }
}else{
    $statusMsg = 'Please select a file to upload.';
}

//Update SQL db by setting the thumbnail column to equal $Thumbnail
$update = $conn->query("update Threads set thumbnail = '$Thumbnail' where filename = '$fileName'");
            if($update){
               $statusMsg = "Updated the thumbnail to sql correctly.";
		echo $statusMsg ;  } 
else 
{ echo "\n Failed to update Thumbnail. Thumbnail equals $Thumbnail" ; } 


// Display status message
echo $statusMsg;
?>

And this does work on most files however it is not working on a 9.9mb png file  which is named "test.png" I tested on another 3.3 mb gif file and that failed too?

For some reason it returns the following

Updated the thumbnail to sql correctly.Updated the thumbnail to sql correctly.

Whereas on the files it works on it returns

REturned with status 0 and output: Retval is null Thumbnail equals upload/Thumbnails/'rainbow-trh-stache.gif' Failed to update Thumbnail. Thumbnail equals upload/Thumbnails/'rainbow-trh-stache.gif'The file rainbow-trh-stache.gif has been uploaded successfully.

Any idea on why this is?

Hi I call a function with values of 51 and 100 but the function receives values 1 and 50

<?php
// EmilyMoor Version 1.0.0   05-07-2019   Desmond O'Toole.
ini_set('display_errors', 1);
error_reporting(E_ALL);
require("../secure/SecureFunctions.php");
require("secure/SecureFunctionsEmilyMoor.php");
$page = "Emily Moor";
session_start();

$Browser = $_SERVER['HTTP_USER_AGENT'];

if (!isset($_SESSION["PageValue"]))
    $_SESSION["PageValue"] = '1';

$_SESSION["PageValue"] = 2; // Keeps going back to 1

if($_SESSION["PageValue"] == 1)
{
	$_SESSION["StartValue"] = 1;
	$_SESSION["EndValue"] = 50;
}

if($_SESSION["PageValue"] == 2)
{
	$_SESSION["StartValue"] = 51;
	$_SESSION["EndValue"] = 100;
}

if($_SESSION["PageValue"] == 3)
{
	$_SESSION["StartValue"] = 101;
	$_SESSION["EndValue"] = 150;
}

if($_SESSION["PageValue"] == 4)
{
	$_SESSION["StartValue"] = 151;
	$_SESSION["EndValue"] = 200;
}

if($_SESSION["PageValue"] == 5)
{
	$_SESSION["StartValue"] = 201;
	$_SESSION["EndValue"] = 250;
}

if($_SESSION["PageValue"] == 6)
{
	$_SESSION["StartValue"] = 251;
	$_SESSION["EndValue"] = 300;
}

echo $_SESSION["PageValue"] . " - " . $_SESSION["StartValue"] . " - " . $_SESSION["EndValue"] . "<br>";

$qStationDetails = GetChanelInfo($_SESSION["StartValue"],$_SESSION["EndValue"]);
$rs = mysql_fetch_array($qStationDetails) or die ("E3001-101A");
$Name = $rs['Description'];


?>

function GetChanelInfo($StartCH, $EndCH) // E2004
{
	echo "Channels = " . $StartCH . " " . $EndCH . "<br>"; // values are 1 and 50
	$sqlChanelInfo = "SELECT * FROM  TV_EmilyMoor WHERE ID >= $StartCH and ID <= $EndCH";
	echo $sqlChanelInfo . "<br />";
	$qChanelInfo = mysql_query($sqlChanelInfo) or die ("E3004-01A");
	return $qChanelInfo;
}