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大写小写相互转换

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Release： 2016-06-13 12:58:04
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大写小写互相转换
现在客户端和服务器端的PHP base64 的编码方式不同
例如服务器端为 aGVsbG8=
那么客户端就是 AgvSBg8= 我怎么才能做到转换大小写？
我现在的做法是遍历每个字节的ASCII码，判断大小，然后决定加减32
------解决方案--------------------

print preg_replace('/([a-z]*)([A-Z]*)/e',"strtolower('\$2').strtoupper('\$1')",$string);
Copy after login

------解决方案--------------------

本帖最后由 xuzuning 于 2012-11-21 11:18:53 编辑 A    二进制内码表示为 01000001
a    二进制内码表示为 01100001
空格 二进制内码表示为 00100000 

所以字母与空格异或后正好是变换大小写

可见 ASCII 码的创始人是何等的聪明！
Related labels：
ascii nbsp strtolower strtoupper
source：php.cn
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