39      * @param string $text
43     public function fromUtf8(string $text): string  argument
46         $len = strlen($text);
49             $code_point = ord($text[$n]);
57                 $byte2 = ord($text[++$n]);
66                 $byte2 = ord($text[++$n]);
67                 $byte3 = ord($text[++$n]);
87      * @param string $text
91     public function toUtf8(string $text): string  argument
95         foreach (str_split($text, 2) as $character) {
125      * @param string $text
129     public function convertibleBytes(string $text): int  argument
131         return 2 * intdiv(strlen($text), 2);