The new PECL package pdo_sqlsrv-5.1.0preview (devel) has been released at 
http://pecl.php.net/.

Release notes
-------------
[Added]
- Added support for Always Encrypted with basic CRUD functionalities (see 
[here](https://github.com/Microsoft/msphpsql/wiki/Features#aebindparam))
  - Support for Windows Certificate Store (use connection keyword 
ColumnEncryption)
  - Support for custom key store provider (use connection keywords 
ColumnEncryption, CEKeystoreProvider, CEKeystoreName, CEKeystoreEncryptKey)
  - Support for inserting into an encrypted column
  - Support for fetching from an encrypted column
- Added support for MSODBC 17 preview
- Added Driver option to set the ODBC driver, Added"Driver" option, valid 
values are ODBC Driver 13 for SQL Server,ODBC Driver 11 for SQL Server, and 
ODBC Driver 17 for SQL Server
  - If the user intends to use the new Always Encrypted features, we recommend 
you to specify explicitly the 'Driver' option to 'ODBC Driver 17 for SQL 
Server' in the connection string
[Limitation]
- Always Encrypted functionalities are only supported using [MSODBC 17 
preview](https://github.com/Microsoft/msphpsql/tree/dev/ODBC%2017%20binaries%20preview)
  - ODBC binaries for macOS available upon request
- MSODBC 17 preview msodbcsql.msi only works for Windows10
- [Always Encrypted 
limitations](https://github.com/Microsoft/msphpsql/wiki/Features#aelimitation)
- when using sqlsrv_query with Always Encrypted feature, SQL type has to be 
specified for each input (see 
[here](https://github.com/Microsoft/msphpsql/wiki/Features#aebindparam))
- No support for inout / output params when using sql_variant type
[Known Issues]
- Connection pooling on Linux doesn't work properly if the user uses the 
MSODBC17 preview
- PDO::quote returns truncated string with garbage characters appended if the 
string contains a ASCII NUL ('/0') character
- When pooling is enabled in Linux or MAC
  - unixODBC 2.3.4 or prior (Linux and MAC) might not return proper diagnostics 
information, such as error messages, warnings and informative messages
  - due to this unixODBC bug, fetch large data (such as xml, binary) as streams 
as a workaround. See the examples 
(https://github.com/Microsoft/msphpsql/wiki/Connection-Pooling-on-Linux-and-Mac)

Package Info
-------------
The Microsoft Drivers for PHP for SQL Server are PHP extensions that allow for 
the reading and writing of SQL Server data from within PHP scripts. The SQLSRV 
extension provides a procedural interface while the PDO_SQLSRV extension 
implements PDO for accessing data in all editions of SQL Server 2008 R2 and 
later (including Azure SQL DB). These drivers rely on the Microsoft ODBC Driver 
for SQL Server to handle the low-level communication with SQL Server.
*This package contains only the PDO_SQLSRV driver.*

Related Links
-------------
Package home: http://pecl.php.net/package/pdo_sqlsrv
   Changelog: http://pecl.php.net/package-changelog.php?package=pdo_sqlsrv
    Download: http://pecl.php.net/get/pdo_sqlsrv-5.1.0preview.tgz

Authors
-------------
Jay Kint <jayk...@microsoft.com> (lead)
Meet Bhagdev <me...@microsoft.com> (lead)
Marie Barwin (lead)
Hadis Fard (lead)


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