不多说 直接上代码

/**
 * des加密
 * @param  [type]  $str      [description]
 * @param  [type]  $key      [description]
 * @param  boolean $toBase64 [description]
 * @return [type]            [description]
 */
function encryptStr($str, $key, $toBase64 = true)
{
    $block = mcrypt_get_block_size('des', 'ecb');
    $pad = $block - (strlen($str) % $block);
    $str .= str_repeat(chr($pad), $pad);
    $enc_str = mcrypt_encrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);
    return (true == $toBase64) ? base64_encode($enc_str) : $enc_str;
}

/**des解密
 * @param $str
 * @param $key
 * @return mixed
 */
function decryptStr($str, $key){
    $str = base64_decode($str);
    $str = mcrypt_decrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);
    $block = mcrypt_get_block_size('des', 'ecb');
    $pad = ord($str[($len = strlen($str)) - 1]);
    $res = urldecode(substr($str, 0, strlen($str) - $pad));
    return json_decode(urldecode($res),true);

}

以上就是des+base64加密解密 用法如下

$key = '123456';
$data = '4564564654dfsfdsfsdfsfsffafas';
//加密
$res = urlencode(encryptStr(urlencode(json_encode($data,JSON_UNESCAPED_UNICODE)), $key))
var_dump($res);
//解密
$res1 = decryptStr(urldecode($data),$key);
var_dump($res1);