Fix for PHP 8.6.0beta3

[remicollet]

  . The misnamed ZVAL_IS_NULL() has been removed. Use Z_ISNULL() instead.

  . The INI_STR(), INI_INT(), INI_FLT(), and INI_BOOL() macros have been
    removed. Instead new zend_ini_{bool|long|double|str|string}_literal()
    macros have been added. This fixes an internal naming inconsistency as
    "str" usually means zend_string*, and "string" means char*.
    However INI_STR() returned a char*

  . The XtOffsetOf() alias of C’s offsetof() macro has been removed. Use
    offsetof() directly.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.66%. Comparing base (5b9c650) to head (c935705).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #96   +/-   ##
=======================================
  Coverage   88.66%   88.66%           
=======================================
  Files          27       27           
  Lines        3176     3176           
  Branches      463      454    -9     
=======================================
  Hits         2816     2816           
  Misses        360      360           

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