base64 encode and decode

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;
}