protected function normalizeKey($item, $key = null)
    {
        // If the user wants to provide their own cache
        // key, we'll opt for that.
        if (is_string($item) || is_string($key)) {
            return is_string($item) ? $item : $key;
        }
        
        // Otherwise we'll try to use the item to calculate
        // the cache key, itself.
        if (is_object($item) && method_exists($item, 'getCacheKey')) {
            return $item->getCacheKey();
        }
    
        // If we're dealing with a collection, we'll 
        // use a hashed version of its contents.
        if ($item instanceof \Illuminate\Support\Collection) {
            return md5($item);
        }
    
        throw new Exception('Could not determine an appropriate cache key.');
    }
protected function normalizeKey($item, $key = null)
    {
        // If the user wants to provide their own cache
        // key, we'll opt for that.
        if (is_string($item) || is_string($key)) {
            return is_string($item) ? $item : $key;
        }
        
        // Otherwise we'll try to use the item to calculate
        // the cache key, itself.
        if (is_object($item) && method_exists($item, 'getCacheKey')) {
            return $item->getCacheKey();
        }
    
        // If we're dealing with a collection, we'll 
        // use a hashed version of its contents.
        if ($item instanceof \Illuminate\Support\Collection) {
            return md5($item);
        }
    
        throw new Exception('Could not determine an appropriate cache key.');
    }
protected function normalizeKey ( $ item , $ key = null ) { // If the user wants to provide their own cache // key, we'll opt for that. if ( is_string ( $ item ) || is_string ( $ key ) ) { return is_string ( $ item ) ? $ item : $ key ; } // Otherwise we'll try to use the item to calculate // the cache key, itself. if ( is_object ( $ item ) && method_exists ( $ item , 'getCacheKey' ) ) { return $ item -> getCacheKey ( ) ; } // If we're dealing with a collection, we'll  // use a hashed version of its contents. if ( $ item instanceof \ Illuminate \ Support \ Collection ) { return md5 ( $ item ) ; } throw new Exception ( 'Could not determine an appropriate cache key.' ) ; }
Normalize the cache key.

@param mixed       $item
@param string|null $key
Normalize the cache key .