PHP Helper functions for Safe Base64 URL encode

base64URLSafe.php

<?php

/*
 * Copied from https://github.com/firebase/php-jwt/blob/feb0e820b8436873675fd3aca04f3728eb2185cb/src/JWT.php#L350
 */
function encodeURLSafe($data): string
{
    return \str_replace('=', '', \strtr(\base64_encode($data), '+/', '-_'));
}

/*
 * Copied from https://github.com/firebase/php-jwt/blob/feb0e820b8436873675fd3aca04f3728eb2185cb/src/JWT.php#L333
 */
function decodeURLSafe($data): string|false
{
    $remainder = \strlen($data) % 4;
    if ($remainder) {
        $padlen = 4 - $remainder;
        $data .= \str_repeat('=', $padlen);
    }
    return \base64_decode(\strtr($data, '-_', '+/'));
}