Base64 Encode and Decode String in PHP

function base64url_encode($plainText) {

    $base64 = base64_encode($plainText);

    $base64url = strtr($base64, '+/=', '-_,');

    return $base64url;

}

 

function base64url_decode($plainText) {

    $base64url = strtr($plainText, '-_,', '+/=');

    $base64 = base64_decode($base64url);

    return $base64;

}