PHP 8.6 UPGRADE NOTES

1. Backward Incompatible Changes
2. New Features
3. Changes in SAPI modules
4. Deprecated Functionality
5. Changed Functions
6. New Functions
7. New Classes and Interfaces
8. Removed Extensions and SAPIs
9. Other Changes to Extensions
10. New Global Constants
11. Changes to INI File Handling
12. Windows Support
13. Other Changes
14. Performance Improvements

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1. Backward Incompatible Changes
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2. New Features
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- Core:
  . It is now possible to use reference assign on WeakMap without the key
    needing to be present beforehand.

- Intl:
  . Added IntlNumberRangeFormatter class to format an interval of two numbers with a given skeleton, locale, IntlNumberRangeFormatter::COLLAPSE_AUTO, IntlNumberRangeFormatter::COLLAPSE_NONE, IntlNumberRangeFormatter::COLLAPSE_UNIT, IntlNumberRangeFormatter::COLLAPSE_ALL collapse and
    IntlNumberRangeFormatter::IDENTITY_FALLBACK_SINGLE_VALUE, IntlNumberRangeFormatter::IDENTITY_FALLBACK_APPROXIMATELY_OR_SINGLE_VALUE, IntlNumberRangeFormatter::IDENTITY_FALLBACK_APPROXIMATELY and
    IntlNumberRangeFormatter::IDENTITY_FALLBACK_RANGE identity fallbacks.
    It is supported from icu 63.
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3. Changes in SAPI modules
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4. Deprecated Functionality
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5. Changed Functions
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6. New Functions
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7. New Classes and Interfaces
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8. Removed Extensions and SAPIs
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9. Other Changes to Extensions
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- Hash:
  . The bundled version of xxHash was upgraded to 0.8.2.

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10. New Global Constants
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11. Changes to INI File Handling
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- Mysqli:
  . mysqli.default_port now checks the validity of the value which should be
    between 0 and 65535 included.

- Opcache:
  . opcache.jit_debug accepts a new flag: ZEND_JIT_DEBUG_TRACE_EXIT_INFO_SRC.
    When used along with ZEND_JIT_DEBUG_TRACE_EXIT_INFO, the source of exit
    points is printed in exit info output, in debug builds.

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12. Windows Support
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13. Other Changes
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14. Performance Improvements
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- JSON:
  . Improve performance of encoding arrays and objects.