Passing base64 encoded strings in URL

If you have sodium extension installed and need to encode binary data, you can use sodium_bin2base64 function which allows you to select url safe variant.

for example encoding can be done like that:

$string = sodium_bin2base64($binData, SODIUM_BASE64_VARIANT_URLSAFE);

and decoding:

$result = sodium_base642bin($base64String, SODIUM_BASE64_VARIANT_URLSAFE);

For more info about usage, check out php docs:

https://www.php.net/manual/en/function.sodium-bin2base64.php https://www.php.net/manual/en/function.sodium-base642bin.php

For url safe encode, like base64.urlsafe_b64encode(...) in Python the code below, works to me for 100%

function base64UrlSafeEncode(string $input)
{
   return str_replace(['+', '/'], ['-', '_'], base64_encode($input));
}