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$user_username = $_POST['userName'];
$user_password = $_POST['passWord'];

$hashed_password = password_hash($user_password, PASSWORD_DEFAULT);

  if(isset($_POST['submit_button'])) {
      $accountInfo = $user_username . ":" . $hashed_password . "\n";
      $filepath = fopen('useraccounts.txt', 'a+');
      $file = "useraccounts.txt";

      if (file_exists($file)) {
          $content = file_get_contents($file);
          $content = explode("\n", $content);
          $users = array();

          foreach ($content as $value) {
              $user = explode(':', $value);
              $users[$user[0]] = $user[1];
          }
          print_r($users);

          if(array_key_exists($user_username, $users)){
              echo "username is alrdy taken";
          }

          if (isset($users[$_POST['userName']])) {
              echo "that name is alrdy taken";
          }
          elseif (empty($user_username) || empty($user_password)) {
              echo "Fill in both PASSWORD and USERNAME";
          }
          else {
              fwrite($filepath, $accountInfo);
              echo "saved";
          }
          fclose($filepath);
      }
  }