private static function skipMixed($string)
    {
        $firstLetterLower = $string[0] == mb_strtolower($string[0]);
        $allLowerOrUpper  = (mb_strtolower($string) == $string || mb_strtoupper($string) == $string);

        return ! ($firstLetterLower || $allLowerOrUpper);
    }
private static function skipMixed($string)
    {
        $firstLetterLower = $string[0] == mb_strtolower($string[0]);
        $allLowerOrUpper  = (mb_strtolower($string) == $string || mb_strtoupper($string) == $string);

        return ! ($firstLetterLower || $allLowerOrUpper);
    }
private static function skipMixed ( $ string ) { $ firstLetterLower = $ string [ 0 ] == mb_strtolower ( $ string [ 0 ] ) ; $ allLowerOrUpper = ( mb_strtolower ( $ string ) == $ string || mb_strtoupper ( $ string ) == $ string ) ; return ! ( $ firstLetterLower || $ allLowerOrUpper ) ; }
Skip if string is mixed case.

@param string $string

@return bool
Skip if string is mixed case .