src/Memory.php
protected function getRememberKey()
    {
        $backtrace = debug_backtrace(4)[2];
        $args = implode('_', $backtrace['args']);
        $key = str_replace('\\', '_', get_class($this).'_'.$backtrace['function'].'_'.$args);

        return $key;
    }
protected function getRememberKey()
    {
        $backtrace = debug_backtrace(4)[2];
        $args = implode('_', $backtrace['args']);
        $key = str_replace('\\', '_', get_class($this).'_'.$backtrace['function'].'_'.$args);

        return $key;
    }
get the cache key.

@return string