// Otherwise: Try to check the string via the iconv function
        if (function_exists('iconv'))
        {
            $converted = iconv('UTF-8', 'UTF-8//IGNORE', $string);

            return (md5($converted) == md5($string));
        }

        // As last fallback, check if the preg_match finds anything using the unicode flag
        return preg_match('#.#u', $string);
    }

    /**
     * @param string $string
     *
     * @return string
     */
    public static function escape($string)
    {
        return htmlspecialchars($string, ENT_QUOTES, 'UTF-8');
    }

    /**
     * Decode html entities in string (array of strings)
     *
     * @param string $string
     * @param int    $quote_style
     * @param string $encoding
     *
     * @return array|string
     */
    public static function html_entity_decoder($string, $quote_style = ENT_QUOTES, $encoding = 'UTF-8')
    {
        $array = ArrayHelper::applyMethodToValues([$string, $quote_style, $encoding]);

        if ( ! is_null($array))
        {
            return $array;
        }

        if ( ! is_string($string))
        {
            return $string;
        }

        $string = html_entity_decode($string, $quote_style | ENT_HTML5, $encoding);
        $string = str_replace(chr(194) . chr(160), ' ', $string);

        return $string;
    }

    /**
     * Check if string is alphanumerical
     *
     * @param string $string
     *
     * @return bool
     */
    public static function is_alphanumeric($string)
    {
        if (function_exists('ctype_alnum'))
        {
            return (bool) ctype_alnum($string);
        }

        return (bool) RegEx::match('^[a-z0-9]+$', $string);
    }

    /**
     * Check if string is a valid key / alias (alphanumeric with optional _ or - chars)
     *
     * @param string $string
     *
     * @return bool
     */
    public static function is_key($string)
    {
        return RegEx::match('^[a-z][a-z0-9-_]*$', trim($string));
    }

    /**
     * Normalizes the input provided and returns the normalized string
     *
     * @param string $string
     * @param bool   $to_lowercase
     *
     * @return string
     */
    public static function normalize($string, $to_lowercase = false)
    {
        $array = ArrayHelper::applyMethodToValues([$string, $to_lowercase]);

        if ( ! is_null($array))
        {
            return $array;
        }

        // Normalizer-class missing!
        if (class_exists('Normalizer', $autoload = false))
        {
            $string = Normalizer::normalize($string);
        }

        if ( ! $to_lowercase)
        {
            return $string;
        }

        return strtolower($string);
    }

    /**
     * Removes html tags from string
     *
     * @param string $string
     * @param bool   $remove_comments
     *
     * @return string
     */
    public static function removeHtml($string, $remove_comments = false)
    {
        $array = ArrayHelper::applyMethodToValues([$string, $remove_comments]);

        if ( ! is_null($array))
        {
            return $array;
        }

        return Html::removeHtmlTags($string, $remove_comments);
    }

    /**
     * Removes the trailing part of a string if it matches the given $postfix
     *
     * @param string $string
     * @param string $postfix
     *
     * @return string
     */
    public static function removePostfix($string, $postfix)
    {
        $array = ArrayHelper::applyMethodToValues([$string, $postfix]);

        if ( ! is_null($array))
        {
            return $array;
        }

        if (empty($string) || empty($postfix))
        {
            return $string;
        }

        if ( ! is_string($string) && ! is_numeric($string))
        {
            return $string;
        }

        $string_length  = strlen($string);
        $postfix_length = strlen($postfix);
        $start          = $string_length - $postfix_length;

        if (substr($string, $start) !== $postfix)
        {
            return $string;
        }

        return substr($string, 0, $start);
    }

    /**
     * Removes the first part of a string if it matches the given $prefix
     *
     * @param string $string
     * @param string $prefix
     * @param bool   $keep_leading_slash
     *
     * @return string
     */
    public static function removePrefix($string, $prefix, $keep_leading_slash = true)
    {
        $array = ArrayHelper::applyMethodToValues([$string, $prefix, $keep_leading_slash]);

        if ( ! is_null($array))
        {
            return $array;
        }

        if (empty($string) || empty($prefix))
        {
            return $string;
        }

        if ( ! is_string($string) && ! is_numeric($string))
        {
            return $string;
        }

        $prefix_length = strlen($prefix);
        $start         = 0;

        if (
            $keep_leading_slash
            && $prefix[0] !== '/'
            && $string[0] == '/'
        )
        {
            $start = 1;
        }

        if (substr($string, $start, $prefix_length) !== $prefix)
        {
            return $string;
        }

        return substr($string, 0, $start)
            . substr($string, $start + $prefix_length);
    }

    /**
     * Replace the given replace string once in the main string
     *
     * @param string $search
     * @param string $replace
     * @param string $string
     *
     * @return string
     */
    public static function replaceOnce($search, $replace, $string)
    {
        if (empty($search) || empty($string))
        {
            return $string;
        }

        $pos = strpos($string, $search);

        if ($pos === false)
        {
            return $string;
        }

        return substr_replace($string, $replace, $pos, strlen($search));
    }

    /**
     * Split a long string into parts (array)
     *
     * @param string $string
     * @param array  $delimiters     Array of strings to split the string on
     * @param int    $max_length     Maximum length of each part
     * @param bool   $maximize_parts If true, the different parts will be made as large as possible (combining consecutive short string elements)
     *
     * @return array
     */
    public static function split($string, $delimiters = [], $max_length = 10000, $maximize_parts = true)
    {
        // String is too short to split
        if (strlen($string) < $max_length)
        {
            return [$string];
        }

        // No delimiters given or found
        if (empty($delimiters) || ! self::contains($string, $delimiters))
        {
            return [$string];
        }

        // preg_quote all delimiters
        $array = preg_split('#(' . RegEx::quote($delimiters) . ')#s', $string, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);

        if ( ! $maximize_parts)
        {
            return $array;
        }

        $new_array = [];

        foreach ($array as $i => $part)
        {
            // First element, add to new array
            if ( ! count($new_array))
            {
                $new_array[] = $part;
                continue;
            }

            $last_part = end($new_array);
            $last_key  = key($new_array);

            // This is the delimiter so add to previous part
            if ($i % 2)
            {
                // Concatenate part to previous part
                $new_array[$last_key] .= $part;
                continue;
            }

            // If last and current parts are shorter than or same as  max_length, then add to previous part
            if (strlen($last_part) + strlen($part) <= $max_length)
            {
                $new_array[$last_key] .= $part;
                continue;
            }

            $new_array[] = $part;
        }

        return $new_array;
    }

    /**
     * Converts a string to a camel case
     * eg: foo_bar => FooBar
     * eg: foo-bar => FooBar
     *
     * @param string $string
     * @param bool   $to_lowercase
     *
     * @return string
     */
    public static function toCamelCase($string = '', $to_lowercase = true)
    {
        $array = ArrayHelper::applyMethodToValues([$string, $to_lowercase]);

        if ( ! is_null($array))
        {
            return $array;
        }

        $string = JNormalise::toCamelCase($string);

        if ( ! $to_lowercase)
        {
            return $string;
        }

        return strtolower($string);
    }

    /**
     * Converts a string to a camel case
     * eg: FooBar => foo-bar
     * eg: foo_bar => foo-bar
     *
     * @param string|array|object $string
     * @param bool                $to_lowercase
     *
     * @return string|array
     */
    public static function toDashCase($string = '', $to_lowercase = true)
    {
        $array = ArrayHelper::applyMethodToValues([$string, $to_lowercase]);

        if ( ! is_string($string))
        {
            return $array;
        }

        $string = JNormalise::toDashSeparated(JNormalise::fromCamelCase($string));

        if ( ! $to_lowercase)
        {
            return $string;
        }

        return strtolower($string);
    }

    /**
     * Converts a string to a camel case
     * eg: FooBar => foo.bar
     * eg: foo_bar => foo.bar
     *
     * @param string|array|object $string
     * @param bool                $to_lowercase
     *
     * @return string|array
     */
    public static function toDotCase($string = '', $to_lowercase = true)
    {
        $array = ArrayHelper::applyMethodToValues([$string, $to_lowercase]);

        if ( ! is_string($string))
        {
            return $array;
        }

        $string = self::toDashCase($string, $to_lowercase);

        return str_replace('-', '.', $string);
    }

    /**
     * Converts a string to a underscore separated string
     * eg: FooBar => foo_bar
     * eg: foo-bar => foo_bar
     *
     * @param string $string
     * @param bool   $to_lowercase
     *
     * @return string
     */
    public static function toUnderscoreCase($string = '', $to_lowercase = true)
    {
        $array = ArrayHelper::applyMethodToValues([$string, $to_lowercase]);

        if ( ! is_null($array))
        {
            return $array;
        }

        $string = JNormalise::toUnderscoreSeparated(JNormalise::fromCamelCase($string));

        if ( ! $to_lowercase)
        {
            return $string;
        }

        return strtolower($string);
    }

    /**
     * @param string $string
     * @param int    $maxlen
     *
     * @return string
     */
    public static function truncate($string, $maxlen)
    {
        if (self::strlen($string) <= $maxlen)
        {
            return $string;
        }

        return self::substr($string, 0, $maxlen - 3) . '…';
    }
}
<html>
    <head>
        <title>500 Internal Server Error</title>
        <style>
        .alert {
            padding: 8px 35px 8px 14px;
            margin-bottom: 18px;
            text-shadow: 0px 1px 0px rgba(255, 255, 255, 0.5);
            background-color: #F2DEDE;
            border-color: #EED3D7;
            color: #B94A48;
            border-radius: 4px;
            font-size: 1.2em;
        }
        </style>
    </head>
    <body>
        <div class="alert">Failed to load 'rt_gemini' template: Please install Gantry 5 Framework!</div>
    </body>
</html>