Symfony\Component\VarDumper\Caster\ExceptionCaster::traceUnshift PHP Method

    private static function traceUnshift(&$trace, $class, $file, $line)
    {
        if (isset($trace[0]['file'], $trace[0]['line']) && $trace[0]['file'] === $file && $trace[0]['line'] === $line) {
            return;
        }
        array_unshift($trace, array('function' => $class ? 'new ' . $class : null, 'file' => $file, 'line' => $line));
    }