PHP加密解密类实例代码

关键代码如下所示：

    <?php
    function 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));
    }
    }

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