Fix an error call to undefined function mysql_fetch_assoc()

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SQL

PHP

I am receiving the error "Call to undefined function mysql_fetch_assoc()" on this line of code;

while ($row =mysql_fetch_assoc($result)){

This is the full php code I am using for the function. It is initially to upload a users profile picture

<?php 
if (!isset($_SESSION["currentUser"])) 
     header("Location: userprofilepage.php");
session_start();
include("dbConnect.php");

$sql = "SELECT * FROM Users";
$result = $conn->query($sql);


if (($result ) >0) {
	while ($row =mysql_fetch_assoc($result)){
    $id =$row['id'];
	$queryImg = "SELECT * FROM profileimg WHERE userid='$id'";
	$stmtImg = mysql_query($conn, $queryImg);
    while ($rowImg =mysql_fetch_assoc($resultImg))	{
		echo "<div>";
		if (rowImg['status'] ==0) {
			echo "<img src ='uploads/profile".$id.".jpg?".mt_rand()."'>";
		} else {
			echo "<img src='uploads/profiledefault.jpg'>";
		}
		echo $row['username'];
		echo "</div>";
	}
	}
} else {
	echo "There are no users yet!";
}

?>

What I have tried:

I have tried replacing this and trying other functions but I cant get my head around it.