經典PHP加密解密函數Authcode()修複版代碼

 Authcode這個函數很多人都使用，這函數來自Discuz程式，用於加密解密字串，可以設定鑰匙（key）和到期時間，在很多時候都用得著。原版的函數代碼可能會產生+、/、&這樣的字元，導致通過URL傳值取回時被轉義，導致無法解密。火端網路稍加修改，把這幾個字元替換成其它字元，解密時再替換回去，這樣就完美了！

代碼如下： 

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function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0){   if($operation == 'DECODE') { $string = str_replace('[a]','+',$string); $string = str_replace('[b]','&',$string); $string = str_replace('[c]','/',$string); } $ckey_length = 4; $key = md5($key ? $key : 'livcmsencryption '); $keya = md5(substr($key, 0, 16)); $keyb = md5(substr($key, 16, 16)); $keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : ''; $cryptkey = $keya.md5($keya.$keyc); $key_length = strlen($cryptkey); $string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string; $string_length = strlen($string); $result = ''; $box = range(0, 255); $rndkey = array(); for($i = 0; $i <= 255; $i++) { $rndkey[$i] = ord($cryptkey[$i % $key_length]); } for($j = $i = 0; $i < 256; $i++) { $j = ($j + $box[$i] + $rndkey[$i]) % 256; $tmp = $box[$i]; $box[$i] = $box[$j]; $box[$j] = $tmp; } for($a = $j = $i = 0; $i < $string_length; $i++) { $a = ($a + 1) % 256; $j = ($j + $box[$a]) % 256; $tmp = $box[$a]; $box[$a] = $box[$j]; $box[$j] = $tmp; $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256])); } if($operation == 'DECODE') { if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {   return substr($result, 26); } else { return ''; } } else { $ustr = $keyc.str_replace('=', '', base64_encode($result)); $ustr = str_replace('+','[a]',$ustr); $ustr = str_replace('&','[b]',$ustr); $ustr = str_replace('/','[c]',$ustr); return $ustr; } }