PHP加密解密类实例代码

<?phpfunction i_array_column($input, $columnKey, $indexKey=null){if(!function_exists('array_column')){$columnKeyIsNumber = (is_numeric($columnKey))?true:false;$indexKeyIsNull = (is_null($indexKey))?true :false;$indexKeyIsNumber = (is_numeric($indexKey))?true:false;$result = array();foreach((array)$input as $key=>$row){if($columnKeyIsNumber){$tmp= array_slice($row, $columnKey, 1);$tmp= (is_array($tmp) && !empty($tmp))?current($tmp):null;}else{$tmp= isset($row[$columnKey])?$row[$columnKey]:null;}if(!$indexKeyIsNull){if($indexKeyIsNumber){$key = array_slice($row, $indexKey, 1);$key = (is_array($key) && !empty($key))?current($key):null;$key = is_null($key)?0:$key;}else{$key = isset($row[$indexKey])?$row[$indexKey]:0;}}$result[$key] = $tmp;}return $result;}else{return array_column($input, $columnKey, $indexKey);}}function randcode($len, $mode = 2){$rcode = '';switch($mode){case 1: //去除0、o、O、l等易混淆字符$chars = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789abcdefghijkmnpqrstuvwxyz';break;case 2: //纯数字$chars = '0123456789';break;case 3: //全数字+大小写字母$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz';break;case 4: //全数字+大小写字母+一些特殊字符$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz~!@#$%^&*()';break;}$count = strlen($chars) - 1;mt_srand((double)microtime() * 1000000);for($i = 0; $i < $len; $i++) {$rcode .= $chars[mt_rand(0, $count)];}return $rcode;}/*** $string 明文或密文* $operation 加密ENCODE或解密DECODE* $key 密钥* $expiry 密钥有效期*/function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {$ckey_length = 4;$key = md5($key);$keya = md5(substr($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 {return $keyc.str_replace('=', '', base64_encode($result));}}