Time to do an update.

classes/User.php

@@ -27,6 +27,9 @@ Class User{
      * @throws RandomException
      */
     public function newUser($username, $password, $email){
+        if ($this->check_existing_user($username, $email)){
+            throw new RandomException("User already exists");
+        }
         $this->username = $username;
         $this->email = $email;
         $password2 = password_hash($password, PASSWORD_DEFAULT);
@@ -48,5 +51,19 @@ Class User{
 
     }
 
+    private function check_existing_user($username, $email){
+        $stmt = $this->db->prepare("SELECT * FROM users WHERE username = ? OR email = ?");
+        $stmt->bind_param("ss", $username, $email);
+        $stmt->execute();
+        $result = $stmt->get_result();
+        $user = $result->fetch_assoc();
+        $stmt->close();
+        return $user;
+    }
+
+    public function login(mixed $username, mixed $password)
+    {
+    }
+
 
 }