PHP 8 Compatibility

I’m just going over a WordPress based site updating for PHP 8.1. I found a couple of calls to ltrim() in the redirect function that produce a deprecation error.

Deprecated: ltrim(): Passing null to parameter #1 ($string) of type string is deprecated ...

I found a solution to that by casting the values as string before attempting to trim them:

        $base = ltrim((string) $base, '/');
        $uri = ltrim((string) $uri, '/');

Originally it was

        $base = ltrim($base, '/');
        $uri = ltrim($uri, '/');

There may be a better ways of achieving the same result.