- rtrim: documentation ( source)
- base64_decode: documentation ( source)
- str_repeat: documentation ( source)
- strtr: documentation ( source)
- base64_encode: documentation ( source)
<?php
class Base64Url
{
/**
* @param $str string
*
* @return string
*/
public static function encode($str)
{
$std = @base64_encode($str);
if ($std === false) {
throw new \Exception('base64_encode() failed');
}
return rtrim(strtr($std, '+/', '-_'), '=');
}
/**
* @param $str string
*
* @return string
*/
public static function decode($str)
{
$result = '';
if ($str !== null) {
if (!is_string($str)) {
throw new \Exception('Only strings can be decoded');
}
$std = strtr($str, '-_', '+/').str_repeat('=', strlen($str) % 4);
$result = base64_decode($std, true);
if ($result === false) {
throw new \Exception('base64_decode() failed');
}
}
return $result;
}
}
$ph = '{"typ":"JWT",' . "\n ". '"alg":"HS256"}';
echo Base64Url::decode(Base64Url::encode($ph));