如何将Unicode码点转换为UTF-8十六进制字节？附代码示例

Python 实现 #

通过将十六进制码点映射为Unicode字符，再编码为UTF-8字节并格式化输出：

def unicode_codepoint_to_utf8_hex(codepoint_hex):
    # 将十六进制码点转为整数
    codepoint = int(codepoint_hex, 16)
    # 转为Unicode字符后编码为UTF-8字节
    utf8_bytes = chr(codepoint).encode('utf-8')
    # 格式化每个字节为两位大写十六进制，并用空格分隔
    return ' '.join(f'{byte:02X}' for byte in utf8_bytes)

# 示例调用
print(unicode_codepoint_to_utf8_hex('1F606'))  # 输出: F0 9F 98 86

注意：输入的码点需为不带U+前缀的十六进制字符串，例如1F606而非U+1F606

PHP（兼容Hacklang）实现 #

借助多字节字符处理函数完成码点到UTF-8字节的转换：

function unicodeCodepointToUtf8Hex(string $codepointHex): string {
    // 十六进制码点转整数
    $codepoint = hexdec($codepointHex);
    // 从UTF-32编码生成对应Unicode字符
    $char = mb_chr($codepoint, 'UTF-32');
    // 转换为UTF-8字节序列
    $utf8Bytes = mb_convert_encoding($char, 'UTF-8', 'UTF-32');
    // 遍历每个字节转为大写十六进制并拼接
    $hexSegments = [];
    for ($i = 0; $i < strlen($utf8Bytes); $i++) {
        $hexSegments[] = strtoupper(dechex(ord($utf8Bytes[$i])));
    }
    return implode(' ', $hexSegments);
}

// 示例调用
echo unicodeCodepointToUtf8Hex('1F606'); // 输出: F0 9F 98 86

注意：PHP环境需启用mbstring扩展，Hacklang环境可直接使用上述函数

内容的提问来源于stack exchange，提问作者Connie Shi