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Fix PHP 8.1 "strlen(null)" exception which blocks Working Copy blueprint creation in Drydock

Summary:
`strlen()` was used in Phabricator to check if a generic value is a non-empty string.
This behavior is deprecated since PHP 8.1. So, we adopt an explicit cast to string
in order to answer the question "Is this a non-empty string?" without relying on implicit
cast and deprecated things.

Note: this may highlight other absurd input values that might be worth correcting
instead of just ignoring. If phutil_string_cast() throws an exception in your
instance, report it to Phorge to evaluate and fix that specific corner case.

Closes T15409

Test Plan:
Applied this change and afterwards, selecting "Working Copy" on `/drydock/blueprint/edit/form/default/` does not show a RuntimeException on strlen() anymore. Instead, it shows a PhutilAggregateException covered in T15408.

Try also creating an integer "Custom Field" in some applications like Maniphest (maniphest.custom-field-definitions)
or in the People component (user.custom-field-definitions) etc., populating the related forms with your usual fuzzy tests.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: speck, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15409

Differential Revision: https://we.phorge.it/D25235

Andre Klapper 19d9da7f 2ffbef88

+2 -1
+2 -1
src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldInt.php
··· 24 24 25 25 public function getValueForStorage() { 26 26 $value = $this->getFieldValue(); 27 - if (strlen($value)) { 27 + $is_nonempty = phutil_string_cast($value) !== ''; 28 + if ($is_nonempty) { 28 29 return $value; 29 30 } else { 30 31 return null;