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php中文汉字与16进制编码转换三种方法

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Release： 2016-07-25 08:53:51
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  2. //汉字转换为16进制编码
  3. function hexencode($s) {
  4. return preg_replace('/(.)/es',"str_pad(dechex(ord('\\1')),2,'0',str_pad_left)",$s);
  5. }
  6. //16进制编码转换为汉字
  7. function hexdecode($s) {
  8. return preg_replace('/(\w{2})/e',"chr(hexdec('\\1'))",$s);
  9. }
  10. echo hexdecode(hexencode("北京欢迎您！"));
  11. ?>
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方法2，

  2. echo rawurlencode("北京欢迎您").'
    ';
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返回字符串，此字符串中除了 -_. 之外的所有非字母数字字符都将被替换成百分号（%）后跟两位十六进制数。 解码用：rawurldecode

方法3， gbk版： gbk编码中一个汉字由二个字符组成， 通过ord()函数获取字符的ascii值如果大于127时，就可以确定当前字符为一个汉字的前半部分，还需要获取汉字的后半部分。 当然，这种判断的方法要结合具体的开发环境，如果存在ascii值大于127的单个字符，这种方法判断显然就不正确。

php实现中文字符转十进制的原理就是通过for循环的方法获取一个汉字的二个字符，然后使用ord()函数把各字符转换为十进制。 如上分别是：不 [178 187] 要 [210 170] 迷 [195 212] 恋 [193 181] 哥 [184 231] php 实现中文字符转十六进制的原理： 首先使用ord()函数取出各个中文字符的十进制，具体可查看[php函数篇掌握ord()与chr()函数应用]，然后使用dechex()函数把各个中文字符转化为十六进制。 代码：

  2. $string = "北京欢迎您！";
  3. $length = strlen($string);
  4. echo $string;
  5. $result = array();
  6. //十进制
  7. for($i=0;$iif(ord($string[$i])>127){
  8. $result[] = ord($string[$i]).' '.ord($string[++$i]);
  9. }
  10. }
  11. var_dump($result);
  12. echo '
    ';
  13. //十六进制
  14. $strings = array();
  15. foreach($result as $v){
  16. $dec = explode(" ",$v);
  17. $strings[] = dechex($dec[0])." ".dechex($dec[1]);
  18. }
  19. var_dump($strings);
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utf-8版：

  2. $string = "北京欢迎您！";
  3. $length = strlen($string);
  4. echo $string;
  5. $result = array();
  6. //十进制
  7. for($i=0;$iif(ord($string[$i])>127){
  8. $result[] = ord($string[$i]).' '.ord($string[++$i]).' '.ord($string[++$i]);
  9. }
  10. }
  11. var_dump($result);
  12. echo '
    ';
  13. //十六进制
  14. $strings = array();
  15. foreach($result as $v){
  16. $dec = explode(" ",$v);
  17. $strings[] = dechex($dec[0])." ".dechex($dec[1])." ".dechex($dec[2]);
  18. }
  19. var_dump($strings);
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php中文汉字与16进制编码转换三种方法
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