PHP 8.6 INTERNALS UPGRADE NOTES

1. Internal API changes

2. Build system changes

3. Module changes

4. OpCode changes

5. SAPI changes

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1. Internal API changes
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  . ZSTR_INIT_LITERAL(), zend_string_starts_with_literal(), and
    zend_string_starts_with_literal_ci() now support strings containing NUL
    bytes. Passing non-literal char* is no longer supported.
  . The misnamed ZVAL_IS_NULL() has been removed. Use Z_ISNULL() instead.
  . New zend_class_entry.ce_flags2 and zend_function.fn_flags2 fields were
    added, given the primary flags were running out of bits.
  . The zval_is_true() alias of zend_is_true() has been removed. Call
    zend_is_true() directly instead.

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2. Build system changes
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3. Module changes
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4. OpCode changes
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5. SAPI changes
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