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http://bbs.kl3w.com/thread-117-1-1.html
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// ²ÎÊý½âÊÍ
// $string£º Ã÷ÎÄ »ò ÃÜÎÄ
// $operation£ºDECODE±íʾ½âÃÜ,ÆäËü±íʾ¼ÓÃÜ
// $key£º Ãܳ×
// $expiry£ºÃÜÎÄÓÐЧÆÚ
function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {
// ¶¯Ì¬Ãܳ׳¤¶È£¬ÏàͬµÄÃ÷ÎÄ»áÉú³É²»Í¬ÃÜÎľÍÊÇÒÀ¿¿¶¯Ì¬Ãܳ×
$ckey_length = 4;
// Ãܳ×
$key = md5($key ? $key : $GLOBALS['discuz_auth_key']);
// Ãܳ×a»á²ÎÓë¼Ó½âÃÜ
$keya = md5(substr($key, 0, 16));
// Ãܳ×b»áÓÃÀ´×öÊý¾ÝÍêÕûÐÔÑéÖ¤
$keyb = md5(substr($key, 16, 16));
// Ãܳ×cÓÃÓڱ仯Éú³ÉµÄÃÜÎÄ
$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';
// ²ÎÓëÔËËãµÄÃܳ×
$cryptkey = $keya.md5($keya.$keyc);
$key_length = strlen($cryptkey);
// Ã÷ÎÄ£¬Ç°10λÓÃÀ´±£´æÊ±¼ä´Á£¬½âÃÜʱÑéÖ¤Êý¾ÝÓÐЧÐÔ£¬10µ½26λÓÃÀ´±£´æ$keyb(Ãܳ×b)£¬½âÃÜʱ»áͨ¹ýÕâ¸öÃܳ×ÑéÖ¤Êý¾ÝÍêÕûÐÔ
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