StringUtil.php

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<?php

namespace Sabre\VObject;

class StringUtil {

    static function isUTF8($str) {

        // Control characters
        if (preg_match('%[\x00-\x08\x0B-\x0C\x0E\x0F]%', $str)) {
            return false;
        }

        return (bool)preg_match('%%u', $str);

    }

    static function convertToUTF8($str) {

        $encoding = mb_detect_encoding($str, ['UTF-8', 'ISO-8859-1', 'WINDOWS-1252'], true);

        switch ($encoding) {
            case 'ISO-8859-1' :
                $newStr = utf8_encode($str);
                break;
            /* Unreachable code. Not sure yet how we can improve this
             * situation.
            case 'WINDOWS-1252' :
                $newStr = iconv('cp1252', 'UTF-8', $str);
                break;
             */
            default :
                 $newStr = $str;

        }

        // Removing any control characters
        return (preg_replace('%(?:[\x00-\x08\x0B-\x0C\x0E-\x1F\x7F])%', '', $newStr));

    }

}