PHP 7.2 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


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1. Backward Incompatible Changes
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- Core:
  . gettype() will now return "resource (closed)" instead of "unknown type" for
    closed resources.
  . is_object() will now return true for objects of class
    __PHP_Incomplete_Class.

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2. New Features
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- PCRE:
  . Added `J` modifier for setting PCRE_DUPNAMES.

- Standard:
  . Simplified password hashing API updated to support Argon2i hashes when PHP is compiled with libargon2
    (https://wiki.php.net/rfc/argon2_password_hash).

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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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- Standard:
  . password_hash() can generate Argon2i hashes when the algorithm is set to PASSWORD_ARGON2I. 
    When using PASSWORD_ARGON2I, the following cost factors may be set: 'memory_cost', 'time_cost', 
    and 'threads'. These cost factors will default to 'PASSWORD_ARGON2_DEFAULT_MEMORY_COST', 
    'PASSWORD_ARGON2_DEFAULT_TIME_COST', and 'PASSWORD_ARGON2_DEFAULT_THREADS' respectively if not set.
  . password_verify() can verify Argon2i hashes.
  . password_get_info() and password_needs_rehash() can accept Argon2i hashes.

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6. New Functions
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- Mbstring:
  . Added mb_chr() and mb_ord().
  . Added mb_scurb() that scrub broken multibyte strings.

- Sockets:
  . Added socket_addrinfo_lookup(), socket_addrinfo_connect(),
    socket_addrinfo_bind() and socket_addrinfo_explain().

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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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- EXIF:
   . Added extended exif tag support for the following formats: 
     Samsung, DJI, Panasonic, Sony, Pentax, Minolta & Sigma/Foveon.

- Mbstring
  . mb_check_encoding() accepts array parameter. Both key and value
    ecodings are checked recursively.
  . mb_convert_encoding() accepts array parameter. Only value encodings
    are converted recursively.

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10. New Global Constants
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- Standard:
  . PASSWORD_ARGON2_DEFAULT_MEMORY_COST
  . PASSWORD_ARGON2_DEFAULT_TIME_COST
  . PASSWORD_ARGON2_DEFAULT_THREADS
  . PASSWORD_ARGON2I

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11. Changes to INI File Handling
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- sql.safe_mode
  . This INI directive have been removed.

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12. Windows Support
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13. Other Changes
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