PHP编程：PHP加密解密类实例代码

《PHP加密解密类实例代码》要点：
本文介绍了PHP加密解密类实例代码，希望对您有用。如果有疑问，可以联系我们。

PHP学习关键代码如下所示：

<?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,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,$indexKey);
}
}
function randcode($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,16));
$keyb = md5(substr($key,16,16));
$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string,$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.$keyb),16).$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,10) == 0 || substr($result,10) - time() > 0) && substr($result,10,16) == substr(md5(substr($result,26).$keyb),16)) {
return substr($result,26);
} else {
return '';
}
} else {
return $keyc.str_replace('=','',base64_encode($result));
}
}

以上所述是小编给大家介绍的PHP加密解密类实例代码,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的.在此也非常感谢大家对编程之家网站的支持!