PHP 7.3 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:
  . The ext_skel utility has been completely redesigned with new options and 
    some old options removed. This is now written in PHP and has no external 
	dependencies.
  . Support for BeOS has been dropped.

BCMath:
  . All warnings thrown by BCMath functions are now using PHP's error handling.
	  Formerly some warnings have directly been written to stderr.
  . bcmul() and bcpow() now return numbers with the requested scale. Formerly,
    the returned numbers may have omitted trailing decimal zeroes.

Standard:
  . getimagesize() and related functions now report the mime type of BMP images
	  as image/bmp instead of image/x-ms-bmp, since the former has been registered
		with the IANA (see RFC 7903).

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2. New Features
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BCMath:
  . bcscale() can now also be used as getter to retrieve the current scale in use.

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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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JSON:
  . A new flag has been added, JSON_THROW_ON_ERROR, which can be used with
    json_decode() or json_encode() and causes these functions to throw a
    JsonException upon an error, instead of setting the global error state that
    is retrieved with json_last_error(). JSON_PARTIAL_OUTPUT_ON_ERROR takes
    precedence over JSON_THROW_ON_ERROR.
    (RFC: https://wiki.php.net/rfc/json_throw_on_error)

Standard:
  . debug_zval_dump() was changed to display recursive arrays and objects
    in the same way as var_dump(). Now, it doesn't display them twice.

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6. New Functions
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Date:
  . Added the DateTime::createFromImmutable() method, which mirrors
    DateTimeImmutable::createFromMutable().

Intl:
  . Added void Spoofchecker::setRestrictionLevel(int $level) method, available
    when linked with ICU >= 58.1. Levels are represented as class constants
    - Spoofchecker::ASCII
    - Spoofchecker::HIGHLY_RESTRICTIVE
    - Spoofchecker::MODERATELY_RESTRICTIVE
    - Spoofchecker::MINIMALLY_RESTRICTIVE
    - Spoofchecker::UNRESTRICTIVE
    - Spoofchecker::SINGLE_SCRIPT_RESTRICTIVE
    For the detailed documentation on the restriction levels, see
    URestrictionLevel under
    http://icu-project.org/apiref/icu4c/uspoof_8h.html

SPL:
  . Added spl_object_id().

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7. New Classes and Interfaces
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JSON:
  . JsonException

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8. Removed Extensions and SAPIs
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9. Other Changes to Extensions
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 FTP:
  . Set default transfer mode to binary

 ODBC: 
  . Support for ODBCRouter has been removed.
  . Support for Birdstep has been removed.

 ZIP:
  . Bunled libzip has been dropped,
    system library is now required.

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10. New Global Constants
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JSON:
  . JSON_THROW_ON_ERROR

PGSQL:
  . Requires Postgres 9.3
    - PGSQL_DIAG_SCHEMA_NAME
	- PGSQL_DIAG_TABLE_NAME
	- PGSQL_DIAG_COLUMN_NAME
	- PGSQL_DIAG_DATATYPE_NAME
	- PGSQL_DIAG_CONSTRAINT_NAME
  . Requires Postgres 9.6
    - PGSQL_DIAG_SEVERITY_NONLOCALIZED

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11. Changes to INI File Handling
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- birdstep.max_links
  . This INI directive has been removed.

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12. Windows Support
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13. Other Changes
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