PHP - Error In Code, Going To White Screen And Not Redirecting

<?php
spl_autoload_register(function ($class) {
    include '/lib/' . $class . '.inc';
});

$servers = new servers;
echo $servers->get_servers(); 
echo "STATUS: ".$servers->get_status("0.0.0.0",80); //<<-- KILLS PAGE
?>

<?php
ini_set('display_errors',1);
ini_set('display_startup_errors',1);
error_reporting(E_ALL);
error_reporting(-1);

	include_once '../../Global-Includes/ServerStatus/db-connect.php';
	
//namespace xStatus;

class servers {

	private $db_Hostname	= HOSTNAME;
	private $db_Username	= USERNAME;
	private $db_Password	= PASSWORD;
	private $db_Database	= DATABASE;
	
	private $dbSQL			= '';
 
    function __construct() {
		
	} // End Construct
	
		public function get_servers(){
			
			$db = new mysqli($this->db_Hostname,$this->db_Username,$this->db_Password,$this->db_Database); 
		
				$message = '';

				// list current servers from database
				$sql = "SELECT * FROM tbl_servers";
				$res = $db->query($sql);
				
				if ($res->num_rows > 0) {
					
					$message = '<h3>Current Servers</h3>';
					
					while ($row = $res->fetch_assoc()) {
						
						$message .= $row['HostGame'] . '<br>';
						$message .= $row['HostIP'] . '<br>';
						$message .= $row['HostPort'] . '<br>';
						$message .= $this->get_status($row['HostIP'],$row['HostPort']) . '<br>'; //<<-- KILLS PAGE!
						
					}
				}
				
				$message .= "<br>End of the \"Server List\" ";
				
			return $message;
			
			}
		
	
		public function get_status(&$ServerIP,&$ServerPort){
			
			if(@stream_socket_client("tcp://".$this.$ServerIP.":".$this.$ServerPort."", $errno, $errstr, 1) !== false) {
				return "Online";
			} else {
				return "Offline";
			}
			return "Offline";
			}
	
} // End class

?>

Fairly new to PHP and have the following code which should simply output into 3 columns - I have checked the query which does work - so I dont understand why I get this error

mysql_fetch_array() expects parameter 1 to be resource,

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}

$sql = “SELECT * FROM duration_matched WHERE groupm = '”.$coincidence ."’";
$result = $conn->query($sql);

// set up loop counter
$col_count = 0;

// start table and first tr
echo ‘

’;

while ($row=mysql_fetch_array($result)) {
// if you have output 3 cols then end tr and start a new one
if ($col_count == 3) {
echo ‘

’;
// and reset the col count
$col_count = 0;
}

// always output the td
echo ‘

’;
// and count the column
$col_count++;
}

// then close off the last row and the table
echo ‘

’ . $row[‘image’] . ‘

’;

$conn->close();

Welcome <?php echo $_COOKIE["username"]; ?><br>
chatroom: <?php echo $_COOKIE["chatroom"]; ?>
<?php

$phpfile=$_COOKIE["chatroom"];
$chpage = $phpfile .".php";
$chtext = $phpfile .".txt";


$filename = $_COOKIE["chatroom"] . ".txt"; 
$myfile = fopen($filename, "r") or die("Unable to open file!");
fopen($myfile);
fclose($myfile);

include $chtxt;

?>

<form action="post.php" method="post">
message: <input type="text" name="msg"><br>
<input type="submit">
</form>

Hi, I still a noob in PHP programming I hope somebody in the forum can help me and give an ideas how to fixed to this problem,

everytime I run localhost this message appear:

But if I type localhost/(anycharacter) the page appear but with error 404(kindly refer to image, all other buttons are working except the one indicated with the arrow( kindly refer on the last image, note: app_debug set to true), this problem keeps bugging me for a few weeks now that I still cannot find a way to fixed it. Thank you in advance.

)

<?php

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

include 'helpers.php';

$foldername = uniqid();
 
$destination = "vierkant/$foldername";
$locatie = "circles/$foldername";


createDirectory($locatie);
createDirectory($destination);






    $upload_files = [];

    for ($i = 0; $i < count($_FILES['file']['name']); $i++) {
        move_uploaded_file(
            $_FILES['file']['tmp_name'][$i],
            $destination . '/' . $_FILES['file']['name'][$i]
        );

        $target_name = $_FILES['file']['name'][$i];

        // Remove the extension and replace it with .png.

         imagepng(imagecreatefromstring(file_get_contents($_FILES["file"]["tmp_name"] )), "output.png");




       // One method for this is to use the "explode" function with a dot as a delimiter.


// variable we are going to split


  print_r (explode(".",$target_name));



        // Then replace the last part with png and then stick the string back together with "implode"

        $upload_files[] = [
            'square' => $destination . '/' . $_FILES['file']['name'][$i],
            'circle' => $locatie . '/' . $_FILES['file']['name'][$i],
        ];
    }







foreach ($upload_files as $loopdata) {
         print_r($loopdata['circle']);

        toCircle($loopdata['square'],$loopdata['circle'],'450');


}

I have to do this but i get this error: https://ibb.co/mFzxqXL

can anyone help me?

// Remove the extension and replace it with .png.

// One method for this is to use the "explode" function with a dot as a delimiter.

// variable we are going to split:

  // Then replace the last part with png and then stick the string back together with "implode"

$("#login_button").click(function() {
  $.post("inc/login.php", $("#loginForm").serialize(), function(data) {
   var login = data.login;
   var message = data.message;
   if(login == true) {
    $("#login").empty().delay(5000).fadeOut('slow');
   }
   if(login == false) {
    $("#login_window").css('visibility','hidden');
    $("#message").css('visibility','visible').html(message);
    $("#message").delay(4000).queue(function() {
     $("#message").empty().css('visibility','hidden');
     $("#login_window").css('visibility','visible');
    });
   }
  }, "json");
});

please can you help .. I'm passing a value from another page using $_SESSION and trying to then use it in a SELECT statement in SQL think I'm missing something ... if hard code the value it works , and I have also checked at the other end that the variable is being assigned ...

code is (its the = $_SESSION['g_district'] "); that's causing the issue

I'm getting 

Parse error: syntax error, unexpected '' (T_ENCAPSED_AND_WHITESPACE), expecting '-' or identifier (T_STRING) or variable (T_VARIABLE) or number (T_NUM_STRING) in /Applications/XAMPP/xamppfiles/htdocs/mytimekeeper/add/add.php on line 170 in the browser

     <div class="row s2 m2 l2">    
                <div>
                <label for="course_id">Choose the course raced:</label>
                <select name="course_id">
    	            <?php
    	                // query to create course_id dropdown
    	                $resultset = $conn->query("SELECT `course_id`,`course_name` FROM `tbl_courses` WHERE `district`= $_SESSION['g_district'] ");
                        while($row = $resultset->fetch_assoc())
                        { 
                        echo "<option value='{$row[course_id]}'>{$row['course_name']}</option>";   
                        }
      	            ?>  
	            </select>