php(8.4): Fixes for implicit nullability deprecation.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.42%. Comparing base (fb5ef82) to head (b61f004).
⚠️ Report is 1 commits behind head on 22.0.

Additional details and impacted files

@@            Coverage Diff            @@
##               22.0   #20518   +/-   ##
=========================================
  Coverage     65.42%   65.42%           
  Complexity    11266    11266           
=========================================
  Files           428      428           
  Lines         37064    37064           
=========================================
  Hits          24250    24250           
  Misses        12814    12814           

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