public static function getArrayKeys($content)
    {
        preg_match_all(self::ARRAY_KEYS_REGEX, trim($content), $matches);

        return !empty($matches) ? $matches[1] : array();
    }
public static function getArrayKeys($content)
    {
        preg_match_all(self::ARRAY_KEYS_REGEX, trim($content), $matches);

        return !empty($matches) ? $matches[1] : array();
    }
public static function getArrayKeys ( $ content ) { preg_match_all ( self :: ARRAY_KEYS_REGEX , trim ( $ content ) , $ matches ) ; return ! empty ( $ matches ) ? $ matches [ 1 ] : array ( ) ; }
Get the list of keys to be retained with an array representation if they are empty.

@param string $content The content

@return string[]
Get the list of keys to be retained with an array representation if they are empty .