Issue #3299271 by poker10: [D7 PHP 8.1] strlen(): Passing null to parameter #1...

    // the microtime() - is prepended rather than appended. This is to avoid

    // directly leaking $random_state via the $output stream, which could

    // allow for trivial prediction of further "random" numbers.

    if (strlen($bytes) < $count) {

    if (strlen((string) $bytes) < $count) {

      // Initialize on the first call. The contents of $_SERVER includes a mix of

      // user-specific and system information that varies a little with each page.

      if (!isset($random_state)) {