解密值未正确显示

Question

I am encrypting the values and sending an encrypted value on another page with the help of URL and there I am decrypting values but decrypted value is not displaying properly. I am getting output like \j3�B��9[r�m�N�B~=��:�nc.�

Would you help me in this?

Index.php

$input =5;
$encrypted = encryptIt( $input );
echo $encrypted;
function encryptIt( $q ) {
    $cryptKey  = 'qJB0rGtIn5UB1xG03efyCp';
    $qEncoded      = base64_encode( mcrypt_encrypt( MCRYPT_RIJNDAEL_256, md5( $cryptKey ), $q, MCRYPT_MODE_CBC, md5( md5( $cryptKey ) ) ) );
    return( $qEncoded );
}

echo "<a href='decry.php?user_id=$encrypted'>Click here</a>";

decry.php

$id=$_GET['user_id'];
$decrypted = decryptIt( $id );
echo $decrypted;
function decryptIt( $q ) {
    $cryptKey  = 'qJB0rGtIn5UB1xG03efyCp';
    $qDecoded      = rtrim( mcrypt_decrypt( MCRYPT_RIJNDAEL_256, md5( $cryptKey ), base64_decode( $q ), MCRYPT_MODE_CBC, md5( md5( $cryptKey ) ) ), "\0");
    return( $qDecoded );
}

Answer 1

As RiggsFolly said using urlencode(). As I tried it with different numbers it worked fine for some. While others had the problem stated above (I guess it is down the = appearing) but once I added urlencode() that fixed it!

$input =5;
$encrypted = encryptIt( $input );
echo $encrypted;
function encryptIt( $q ) {
    $cryptKey  = 'qJB0rGtIn5UB1xG03efyCp';
    $qEncoded      = base64_encode( mcrypt_encrypt( MCRYPT_RIJNDAEL_256, md5( $cryptKey ), $q, MCRYPT_MODE_CBC, md5( md5( $cryptKey ) ) ) );
    return( $qEncoded );
}

echo "<a href='decry.php?user_id=".urlencode($encrypted)."'>Click here</a>";