Misc::codepoint_to_utf8( int $codepoint ): string

1906    public static function codepoint_to_utf8($codepoint)1907    {1908        $codepoint = (int) $codepoint;1909        if ($codepoint < 0) {1910            return false;1911        } elseif ($codepoint <= 0x7f) {1912            return chr($codepoint);1913        } elseif ($codepoint <= 0x7ff) {1914            return chr(0xc0 | ($codepoint >> 6)) . chr(0x80 | ($codepoint & 0x3f));1915        } elseif ($codepoint <= 0xffff) {1916            return chr(0xe0 | ($codepoint >> 12)) . chr(0x80 | (($codepoint >> 6) & 0x3f)) . chr(0x80 | ($codepoint & 0x3f));1917        } elseif ($codepoint <= 0x10ffff) {1918            return chr(0xf0 | ($codepoint >> 18)) . chr(0x80 | (($codepoint >> 12) & 0x3f)) . chr(0x80 | (($codepoint >> 6) & 0x3f)) . chr(0x80 | ($codepoint & 0x3f));1919        }1920 1921        // U+FFFD REPLACEMENT CHARACTER1922        return "\xEF\xBF\xBD";1923    }