中文验证码如何选取
中文验证码怎么选取?
英文验证码用的是定义26个大小写字母加数字的数组随机下标来获得随机的验证码
请问中文验证码要怎么获得随机的中文？同英文一样定义中文的数组的话会不会太大？
------解决方案--------------------
注意到汉字的 UCS-2 编码从 0x4e00 到 0x9fa6 是连续的
所以你只需
$ch = iconv('ucs-2', 'utf-8', pack('n', rand(0x4e00, 0x9fa6)));
就可随机得到一个汉字
------解决方案--------------------
建一个常用字库，而且验证功能不需要列举所有常用字
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