Base64Url.php

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<?php
namespace Elgg\Security;

class Base64Url {

    public static function encode($bytes) {
        $bytes = base64_encode($bytes);
        $bytes = rtrim($bytes, '=');
        return strtr($bytes, '+/', '-_');
    }

    public static function decode($bytes) {
        $bytes = strtr($bytes, '-_', '+/');
        return base64_decode($bytes);
    }
}