SQLSRV 3.2 is now available from Microsoft that supports PHP 5.6
http://www.microsoft.com/en-us/download/details.aspx?id=20098
PDO_SQLSRV is a driver that implements the PHP Data Objects (PDO) interface to enable access from PHP to MS SQL Server (starting with SQL Server 2005) and SQL Azure databases.
The PDO_SQLSRV extension is enabled by adding appropriate DLL file to your PHP extension directory and the corresponding entry to the php.ini file. The PDO_SQLSRV download comes 8 driver files, four of which are for PDO support. If you are running non-thread-safe PHP (PHP 5.3), use the php_pdo_sqlsrv_53_nts.dll file. (You should use a non-thread-safe version if you are using IIS as your web server). If you are running thread-safe PHP, use the php_pdo_sqlsrv_53_ts.dll file. Similarly for PHP 5.4, use the php_pdo_sqlsrv_54_nts.dll or php_pdo_sqlsrv_54_ts.dll depending on whether your PHP installation is non-thread-safe or thread-safe.
The most recent version of the driver is available for download here: » SQLSRV 3.0 download. If you need support for PHP 5.2 and/or PHP compiled with VC6, use the 2.0 release of the driver: » SQLSRV 2.0 download.
For more information about system requirements, see » SQLSRV System Requirements.
The PDO_SQLSRV extension is only compatible with PHP running on Windows. For Linux, see ODBC and » Microsoft's SQL Server ODBC Driver for Linux.
The constants below are defined by
this driver, and will only be available when the extension has been either
compiled into PHP or dynamically loaded at runtime. In addition, these
driver-specific constants should only be used if you are using this driver.
Using driver-specific attributes with another driver may result in
unexpected behaviour. PDO::getAttribute() may be used to
obtain the PDO_ATTR_DRIVER_NAME
attribute to check the
driver, if your code can run against multiple drivers.
PDO::SQLSRV_TXN_READ_UNCOMMITTED
(integer)
PDO::SQLSRV_TXN_READ_COMMITTED
(integer)
PDO::SQLSRV_TXN_REPEATABLE_READ
(integer)
PDO::SQLSRV_TXN_SNAPSHOT
(integer)
PDO::SQLSRV_TXN_SERIALIZABLE
(integer)
PDO::SQLSRV_ENCODING_BINARY
(integer)
PDO::SQLSRV_ENCODING_SYSTEM
(integer)
PDO::SQLSRV_ENCODING_UTF8
(integer)
PDO::SQLSRV_ENCODING_DEFAULT
(integer)
PDO::SQLSRV_ATTR_QUERY_TIMEOUT
(integer)
PDO::SQLSRV_ATTR_DIRECT_QUERY
(integer)
SQLSRV 3.2 is now available from Microsoft that supports PHP 5.6
http://www.microsoft.com/en-us/download/details.aspx?id=20098
As of 12/12/2014, Microsoft has officially released Version 3.1.
Support for 5.5 has 4 drivers
php_pdo_sqlsrv_55_nts.dll
php_pdo_sqlsrv_55_ts.dll
php_sqlsrv_55_nts.dll
php_sqlsrv_55_ts.dll
Note: Version 3.1 now supports PHP 5.5 and requires Microsoft ODBC Driver 11 (or higher)
You can downlod the new driver from
http://www.microsoft.com/en-us/download/details.aspx?id=20098
Note that Microsoft has not been updating this driver for some time. There are unofficial builds for PHP 5.5 based on patches against the source code head revision (from codeplex), and unconfirmed rumors that getting the source to build with PHP 5.6 is difficult.
Official versions have been released only for PHP 5.2, 5.3 and 5.4.
These problems probably apply to both the PDO driver (pdo_sqlsrv) and the non-PDO driver (sqlsrv extension), since they seem to be built and released together.