Yet another base64url for php

base64url.php

<?php

function base64url_encode($data) {

    if (!mb_check_encoding($data, "ASCII"))
       throw new InvalidArgumentException("Arguments can only contain ASCII characters.");

    return rtrim(strtr(base64_encode($data), '+/', '-_'), '=');
}

function base64url_decode($data) {
    return base64_decode(strtr($data, '-_', '+/'));
}

?>

test.php

<?php

require("base64url.php");

function test_enc(){
    $handle = fopen("plain", "r");
    if ($handle) {
        while (($line = fgets($handle)) !== false) {
            echo base64url_encode(rtrim($line, "\n")) . "\n";
        }
    } else {
    }
    fclose($handle);
}

function test_dec(){
    $handle = fopen("encoded", "r");
    if ($handle) {
        while (($line = fgets($handle)) !== false) {
            echo base64url_decode(rtrim($line, "\n")) . "\n";
        }
    } else {
    }
    fclose($handle);
}


if (PHP_SAPI == 'cli')
    if ($argv[1] == 'enc')
        test_enc();

    if ($argv[1] == 'dec')
        test_dec();

?>