php加密和解密
加密和解密是一项常规任务。用户注册的密码一般不会明文保存，总得加个密先。
最简单的当然是在数据库sql语句中调用md5函数加密用户密码。这里介绍一个加解密类。如果你想在用户忘记密码时为他或她找回原来的密码，那么这个类是个好用的工具。当然，这个加解密类也可用于其他用途。
查看源码
__construct( ->skey = hash("md5", , ); safe_b64encode( = ( = (('+', '/', '='), ('-', '_', ''), safe_b64decode( = (('-', '_'), ('+', '/'), = () % 4 ( .= ('====', ( encode( (! = = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, = mcrypt_create_iv(, = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, ->skey, , MCRYPT_MODE_ECB, (->safe_b64encode( decode( (! = ->safe_b64decode( = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, = mcrypt_create_iv(, = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, ->skey, , MCRYPT_MODE_ECB, ( } View Code
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