如何以安全的方式传递查询字符串变量（如id，name等）和url？

I just want to pass some query string variables with URL like below. But in this way anyone can see the passing variables. I can use base64_encode() and base64_decode() methods but these are also not secure. Because anyone can reverse it. Please help me if anyone have the best solution.

 header('Location: http://www.example.com?id='.$id);
 or 
 header('Location: http://www.example.com?name='.$name);

I think this is the best and secure solution for this..

<?php
/*
 * PHP mcrypt - Basic encryption and decryption of a string
 */
$string = "Some text to be encrypted";
$secret_key = "This is my secret key";

// Create the initialization vector for added security.
$iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND);

// Encrypt $string
$encrypted_string = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $secret_key, $string, MCRYPT_MODE_CBC, $iv);

// Decrypt $string
$decrypted_string = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $secret_key, $encrypted_string, MCRYPT_MODE_CBC, $iv);

echo "Original string : " . $string . "<br />
";
echo "Encrypted string : " . $encrypted_string . "<br />
";
echo "Decrypted string : " . $decrypted_string . "<br />
";
?>

Output will be like below:

Original string : Some text to be encrypted
Encrypted string : –LÁ`b]!üƒN{Iç&|«kÿÅLèëÉ°Xp
Decrypted string : Some text to be encrypted