code: protected static function formatBacktrace(array $backtrace) : array
      {
          if (is_array($backtrace) === false || count($backtrace) === 0) {
              return $backtrace;
          }
  
          /**
           * Remove unnecessary info from backtrace
           */
          if ($backtrace[0]['function'] == '{closure}') {
              unset($backtrace[0]);
          }
  
          /**
           * Format backtrace
           */
          $trace = [];
  
          foreach ($backtrace as $entry) {
  
              /**
               * Function
               */
              $function = '';
  
              if (isset($entry['class'])) {
                  $function .= $entry['class'] . $entry['type'];
              }
  
              $function .= $entry['function'] . '()';
  
              /**
               * Arguments
               */
              $arguments = [];
  
              if (isset($entry['args']) && count($entry['args']) > 0) {
                  foreach ($entry['args'] as $arg) {
                      ob_start();
  
                      var_dump($arg);
  
                      $arg = htmlspecialchars(ob_get_contents());
  
                      ob_end_clean();
  
                      $arguments[] = $arg;
                  }
              }
  
              /**
               * Location
               */
              $location = [];
  
              if (isset($entry['file'])) {
                  $location['file'] = $entry['file'];
                  $location['line'] = $entry['line'];
                  $location['code'] = self::highlightCode($entry['file'], $entry['line']);
              }
  
              /**
               * Compile into array
               */
              $trace[] = array
              (
                  'function'  => $function,
                  'arguments' => $arguments,
                  'location'  => $location,
              );
          }
  
          return $trace;
      }
docs: Modifies the backtrace array.
  
  @param  array $backtrace Array returned by the getTrace() method of an exception object
  @return array