PHP 7.1 INTERNALS UPGRADE NOTES

1. Internal API changes
  a. Path related functions
  b. php_win32_get_random_bytes()
  c. nice() Windows implementation

2. Build system changes
  a. Unix build system changes
  b. Windows build system changes


3. Module changes

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1. Internal API changes
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  a. Path related functions
    - CWD_API void realpath_cache_del(const char *path, size_t path_len);
    - CWD_API realpath_cache_bucket* realpath_cache_lookup(const char *path, size_t path_len, time_t t);
    - PHPAPI void php_clear_stat_cache(zend_bool clear_realpath_cache, const char *filename, size_t filename_len);
    - PHPAPI void php_stat(const char *filename, size_t filename_length, int type, zval *return_value);

  b. php_win32_get_random_bytes()
    The internal randomness source on Windows switched to use CNG API.

  c. nice() now have a Windows alternative that is implemented in win32/nice.c, using
	   SetPriorityClass(). See the implementation for more in-depth details. This also 
	   defines HAVE_NICE.


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2. Build system changes
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  a. Unix build system changes

  b. Windows build system changes

    .  Minimum supported Windows versions are Windows 7/Server 2008 R2.
    . --enable-one-shot configure option is removed, --with-mp is usable.
    . The new binary tools SDK is required for Windows builds, the
      documentation is available under https://wiki.php.net/internals/windows/stepbystepbuild_sdk_2
    . Visual Studio 2017 is utilized for the Windows builds
    . Clang build with ASAN is supported with clang 5+

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3. Module changes
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- Session:
  . php_session_start()/session_reset_id() return value is changed from void to int.
    It returns SUCCESS/FAILURE.
  . Session module manages session status correctly.

- OpenSSL:
  . Windows builds ship with OpenSSL 1.1 by default, lower versions are still supported with custom deps.