yupe\helpers\YText::asciiToEntities PHP Method

    public static function asciiToEntities($str)
    {
        $count = 1;
        $out = '';
        $temp = [];
        for ($i = 0, $s = mb_strlen($str); $i < $s; $i++) {
            $ordinal = ord($str[$i]);
            if ($ordinal < 128) {
                /*
                 * If the $temp array has a value but we have moved on, then it seems only
                 * fair that we output that entity and restart $temp before continuing. -Paul
                 */
                if (count($temp) == 1) {
                    $out .= '&#' . array_shift($temp) . ';';
                    $count = 1;
                }
                $out .= $str[$i];
            } else {
                if (count($temp) == 0) {
                    $count = $ordinal < 224 ? 2 : 3;
                }
                $temp[] = $ordinal;
                if (count($temp) == $count) {
                    $number = $count == 3 ? $temp['0'] % 16 * 4096 + $temp['1'] % 64 * 64 + $temp['2'] % 64 : $temp['0'] % 32 * 64 + $temp['1'] % 64;
                    $out .= '&#' . $number . ';';
                    $count = 1;
                    $temp = [];
                }
            }
        }
        return $out;
    }