<"01234567890123456789012345678912";
public $iv = "23456789"; //like java: private static byte[] myIV = { 50, 51, 52, 53, 54, 55, 56, 57 };
//加密
public function encrypt($input)
{
$input = $this->padding( $input );
$key = base64_decode($this->key);
$td = mcrypt_module_open( MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');
//使用MCRYPT_3DES算法,cbc模式
mcrypt_generic_init($td, $key, $this->iv);
//初始处理
$data = mcrypt_generic($td, $input);
//加密
mcrypt_generic_deinit($td);
//结束
mcrypt_module_close($td);
$data = $this->removeBR(base64_encode($data));
return $data;
}
//解密
public function decrypt($encrypted)
{
$encrypted = base64_decode($encrypted);
$key = base64_decode($this->key);
$td = mcrypt_module_open( MCRYPT_3DES,'',MCRYPT_MODE_CBC,'');
//使用MCRYPT_3DES算法,cbc模式
mcrypt_generic_init($td, $key, $this->iv);
//初始处理
$decrypted = mdecrypt_generic($td, $encrypted);
//解密
mcrypt_generic_deinit($td);
//结束
mcrypt_module_close($td);
$decrypted = $this->removePadding($decrypted);
return $decrypted;
}
//填充密码，填充至8的倍数
public function padding( $str )
{
$len = 8 - strlen( $str ) % 8;
for ( $i = 0; $i < $len; $i++ )
{
$str .= chr( 0 );
}
return $str ;
}
//删除填充符
public function removePadding( $str )
{
$len = strlen( $str );
$newstr = "";
$str = str_split($str);
for ($i = 0; $i < $len; $i++ )
{
if ($str[$i] != chr( 0 ))
{
$newstr .= $str[$i];
}
}
return $newstr;
}
//删除回车和换行
public function removeBR( $str ) 
{
$len = strlen( $str );
$newstr = "";
$str = str_split($str);
for ($i = 0; $i < $len; $i++ )
{
if ($str[$i] != '\n' and $str[$i] != '\r')
{
$newstr .= $str[$i];
}
}
return $newstr;
}
}
//test
$input = "1qaz2ws";
echo "plainText:" . $input."<br/>";
$crypt = new Crypt3Des();
echo "Encode:".$crypt->encrypt($input)."<br/>";
echo "Decode:".$crypt->decrypt($crypt->encrypt($input));
"color: #ff0000">在服务器上做如下设置可解决。

到网上下载一个php的mcrypt模块安装包，只需要libmcrypt.dll文件即可（一般官网上下载的，php目录下已经有的）
1.将libmcrypt.dll复制到system32目录或php安装目录下的extensions目录下 


2.将libmcrypt.dll复制到apache安装目录的bin目录下 


3.到windows目录下找到php.ini文件，打开它


4.找到; Directory in which the loadable extensions (modules) reside. 

extension_dir = "./" 如：extension_dir = "D:\php5\ext"


这两行，要使extension_dir指向的目录下能找到libmcrypt.dll，或系统path下有libmcrypt.dll 


5.找到;Windows Extensions 项下面的;extension=php_mcrypt.dll这一行和;extension=php_iconv.dll（我的没有，省略了）这两行,去掉前面的分号
ps：刚开始看网上的解决方法，有的说修改php安装目录下的php.ini，但是修改后是没用的。一定要修改windows目录下的php.ini！