base64_encode / decode无法正常工作

Question

I am trying to use base64_encode to display the ids differently. I am also trying to add a large number to the id so the string will look longer.

The problem is I encrypt a number to make it a string. Then when I decrypt the same string I expect the same value but in my case it is returning different values.

Why I am not seeing the same values?

This is my code:

define('IDS_SALT', 852045641596357);

function simple_encode($id){
    $data = '';
    $id += IDS_SALT;
    $data = base64_encode($id);
    $data = str_replace(array('+','/','='),array('-','_','.'),$data);
    return $data;
}


function simple_decode($code){
    $data = '';
    $code = str_replace(array('-','_','.'),array('+','/','='),$code);
    $id = base64_decode($code);
    $id -= IDS_SALT;
    return $id;
}

//this is returning "OC41MjA0NTY0MTU5NjM2RSsxNA.."
echo 'Encrypted: ';
echo  simple_encode(7);
echo '<br />';

//this is returning 3 a NOT 7. it should return 7
echo 'Encrypted: ';
echo  simple_decode(  simple_encode(7)  );
echo '<br />';

Answer 1

I just ran the same code (exactly as above) on my test server here - I received different results:

Encrypted: ODUyMDQ1NjQxNTk2MzY0

Encrypted: 7

Which looks to be correct?

Is there any other code in your test script that could be interfering?

Steve