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Fix PHP 8.1 "strlen(null)" exception in PhabricatorAuthStartController.php

Authored by aklapper on May 15 2024, 12:33.
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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.

ERROR 8192: strlen(): Passing null to parameter #1 ($string) of type string is deprecated at [/var/www/html/phorge/phorge/src/applications/auth/controller/PhabricatorAuthStartController.php:34]

Closes T15832

Test Plan

Run arc unit locally, probably also don't be logged in.

Diff Detail

rP Phorge
strlenAuthSessionToken (branched from master)
Lint Passed
Tests Passed
Build Status
Buildable 1260
Build 1260: arc lint + arc unit