Base64-URL Safe Encoding

PHP has built-in support for Base64 Encoding but not Base64-URL encoding. This class encodes and decodes Base64-URL safe strings.

The difference between Base64 and Base64-URL is that Base64-URL uses '-_' characters instead of '+/' and doesn't include '=' padding.




PHP Syntax - Encoding - JSON, Base64, Base64-URL

// Create a Basic Object and Array for Encoding
$object = new \stdClass;
$object->string = 'Test';
$object->number = 123;
$object->bool = true;

$array = [
    'string' => 'Test',
    'number' => 123,
    'bool' => true,

// -------------------------------------------
// Encode and Decode JSON
// -------------------------------------------

// Since PHP Array's are used like a Dictionary or Hash, both examples print:
//     {"string":"Test","number":123,"bool":true}
$json = json_encode($object);
echo $json;
echo "\n";

$json = json_encode($array);
echo $json;
echo "\n\n";

// Use the 2nd Parameter for formatted JSON
$json = json_encode($object, JSON_PRETTY_PRINT);
echo $json;
echo "\n";

// Decode and print the object with details using [print_r()]:
$decoded = json_decode($json);
echo "\n";

// By default an objects are decoded as [stdClass] objects. To return
// an array instead pass [true] as the 2nd parameter.
$decoded = json_decode($json, true);
echo "\n";

// If there is an error decoding JSON data null will be returned.
// If you need to handle invalid JSON you can do so like this:
if ($decoded === null && json_last_error() !== JSON_ERROR_NONE) {
    throw new \Exception('Error decoding JSON Data: ' . json_last_error_msg());

// FastSitePHP includes a JSON helper class which throws exceptions on
// JSON errors instead of the default behavior of returning [false] or [null].
$json = \FastSitePHP\Encoding\Json::encode($object);
$decoded = \FastSitePHP\Encoding\Json::decode($json);

// Often though in most code simply calling [json_encode()] or [json_decode()]
// will be enough. By default PHP decodes large numbers as floats. If you
// want stricter decoding so they come in a strings then you can use additional
// options. This is how FastSitePHP's JSON class decodes as it is used in the
// JWT, Encryption, and SignedData classes. [JSON_BIGINT_AS_STRING] is not
// avaiable on PHP 5.3 so FastSitePHP uses compatible code.
$decoded = json_decode($json, true, 512, JSON_BIGINT_AS_STRING);

// -------------------------------------------
// Encode and Decode Base64
// -------------------------------------------

// Prints: "VGhpcyBpcyBhIHRlc3Q="
$data = 'This is a test';
$base64 = base64_encode($data);
echo $base64;
echo "\n";

// When decoding if there is an error then [false] is returned
$decoded = base64_decode($base64);
echo "\n\n";

// -------------------------------------------
// Encode and Decode Base64-URL Format
// -------------------------------------------

// PHP does not include built-in functions for Base64-URL format so
// FastSitePHP includes a helper class with static methods. They behave
// similar to the built-in functions [base64_encode()]  and [base64_decode()]
// so if there is an error then [false] is returned.

$base64url = \FastSitePHP\Encoding\Base64Url::encode($data);
echo $base64;
echo "\n";

$decoded = \FastSitePHP\Encoding\Base64Url::decode($base64url);
echo "\n";




Encode a string as Base64-URL

返回类型: string



Decode Base64-URL to a string. Returns the decoded data or false on failure. The returned data may be binary. This uses the same behavior as calling the PHP built-in function [base64_decode()].

返回类型: string | false