strlen() was used in Phabricator to check if a generic value is a non-empty string.
This behavior is deprecated since PHP 8.1. Phorge adopts phutil_nonempty_string() as a replacement.
Note: this may highlight other absurd input values that might be worth correcting
instead of just ignoring. If phutil_nonempty_string() throws an exception in your
instance, report it to Phorge to evaluate and fix that specific corner case.
Similarly, passing null to the $haystack parameter of strpos() is deprecated in PHP 8.1.
Similarly, passing null to the $string parameter of ltrim() is deprecated in PHP 8.1.
Closes part of T15335
