PHP learning: how to convert unicode and ordinary strings into each other-PHP Tutorial-php.cn

PHP learning: how to convert unicode and ordinary strings into each other

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Release： 2023-04-06 08:48:02

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本篇文章主要讲述了unicode与普通字符串的相互转化，具有一定参考价值，感兴趣的朋友了解一下。

unicode转字符串

方法一：json

/**
   * unicode转字符串，通过json转化
   * @param $str
   * @return string
   */
  function unicode_decode_by_json($str)
  {
    $json = &#39;{"str":"&#39; . $str . &#39;"}&#39;;
    $arr = json_decode($json, true);
    if (empty($arr)) return &#39;&#39;;
    return $arr[&#39;str&#39;];
  }

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方法二：

/**
   * unicode转中文
   * @param $data
   * @return null|string|string[]
   */
  function unicode_decode($data)
  {
    $rs = preg_replace_callback(&#39;/\\\\u([0-9a-f]{4})/i&#39;, &#39;replace_unicode_escape_sequence&#39;, $data);
    return $rs;
  }

  function replace_unicode_escape_sequence($match)
  {
    return mb_convert_encoding(pack(&#39;H*&#39;, $match[1]), &#39;UTF-8&#39;, &#39;UCS-2BE&#39;);
  }

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字符串转unicode

/**
   * @param  string $str 需转换字符,这里为单个字符
   * @return string
   */
  function get_unicode($str)
  {
    $bin_str = &#39;&#39;;
    $arr = is_array($str) ? $str : str_split($str);//获取字符内部数组表示,此时$arr应类似array(228, 189, 160)
    foreach ($arr as $value) $bin_str .= decbin(ord($value));//转成数字再转成二进制字符串,$bin_str应类似111001001011110110100000,如果是汉字"你"
    $bin_str = preg_replace(&#39;/^.{4}(.{4}).{2}(.{6}).{2}(.{6})$/&#39;, &#39;$1$2$3&#39;, $bin_str);//正则截取, $bin_str应类似0100111101100000,如果是汉字"你"

    $unicode = dechex(bindec($bin_str));//返回unicode十六进制

    $_sup = &#39;&#39;;
    for ($i = 0; $i < 4 - strlen($unicode); $i++) $_sup .= &#39;0&#39;;//补位高字节 0

    return &#39;\\u&#39; . $_sup . $unicode; //加上 \u  返回
  }

  /**
   * 转化字符串为unicode
   * @param $str string 可单个/复数个
   * @return string
   */
  function unicode_encode($str)
  {
    $_arr_str = preg_split(&#39;/(?<!^)(?!$)/u&#39;, $str);//拆分字符串为数组(含中文字符)

    $_ret_unicode = &#39;&#39;;
    foreach ($_arr_str as $_str) $_ret_unicode .= get_unicode($_str);

    return $_ret_unicode;
  }

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测试效果：

 $_str_test = &#39;see,你看我哪里像好人&#39;;
  $_unicode = unicode_encode($_str_test);


  echo $_str_test . &#39; <b style="color: red">=></b> &#39; . $_unicode, &#39;<br><br>&#39;;
  echo $_unicode . &#39; <b style="color: red">=></b> &#39; . unicode_decode($_unicode), &#39;<br><br>&#39;;
  echo $_unicode . &#39; <b style="color: red">=></b> &#39; . unicode_decode_by_json($_unicode), &#39;<br><br>&#39;;

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