Fix PHP 8.4+ implicit-nullable deprecation in U2F Error constructor - #9
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Add explicit ?\Exception type to the $previous parameter. Implicit nullable parameters (Type $x = null) are deprecated as of PHP 8.4 and emit a deprecation notice on every class load under PHP 8.5. Matches the existing @PARAM \Exception|null docblock.
mikelittle
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ferschubert-hm,
filter182,
jerico,
vladislavhmn and
wisyhambolu
May 18, 2026 13:15
wisyhambolu
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Jun 23, 2026
wisyhambolu
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wisyhambolu
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Looks good but @mikelittle should we not also update the doc block here to have same change?
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Summary
includes/Yubico/U2F.php:504declares\Exception $previous = null— an implicit-nullable parameter, deprecated in PHP 8.4 and 8.5. This one-line change adds the explicit?to silence the deprecation notice. The docblock already says@param \Exception|null $previous, so behaviour is unchanged.Repro
Under PHP 8.5, loading any code path that touches
U2F.phpemits:In Altis this fires on every WP request inside the local stack on the PHP 8.5 image.
Context
Targeting
force-2fabecause that's the branch Altis ships from (currently pinned at^0.3.3viaaltis/security).