Перечисленные ниже константы определены данным расширением и могут быть доступны только в том случае, если PHP был собран с поддержкой этого расширения или же в том случае, если данное расширение было подгружено во время выполнения.

SQLSRV_FETCH_ASSOC (integer): Forces sqlsrv_fetch_array() to return an associative array when passed as a parameter.
SQLSRV_FETCH_NUMERIC (integer): Forces sqlsrv_fetch_array() to return an array with numeric when passed as a parameter.
SQLSRV_FETCH_BOTH (integer): Forces sqlsrv_fetch_array() to return an array with both associative and numeric keys when passed as a parameter (the default behavior).
SQLSRV_ERR_ALL (integer): Forces sqlsrv_errors() to return both errors and warings when passed as a parameter (the default behavior).
SQLSRV_ERR_ERRORS (integer): Forces sqlsrv_errors() to return errors only (no warnings) when passed as a parameter.
SQLSRV_ERR_WARNINGS (integer): Forces sqlsrv_errors() to return warnings only (no errors) when passed as a parameter.
SQLSRV_LOG_SYSTEM_ALL (integer): Turns on logging of all subsystems when passed to sqlsrv_configure() as a parameter.
SQLSRV_LOG_SYSTEM_CONN (integer): Turns on logging of connection activity when passed to sqlsrv_configure() as a parameter.
SQLSRV_LOG_SYSTEM_INIT (integer): Turns on logging of initialization activity when passed to sqlsrv_configure() as a parameter.
SQLSRV_LOG_SYSTEM_OFF (integer): Turns off logging of all subsystems when passed to sqlsrv_configure() as a parameter.
SQLSRV_LOG_SYSTEM_STMT (integer): Turns on logging of statement activity when passed to sqlsrv_configure() as a parameter.
SQLSRV_LOG_SYSTEM_UTIL (integer): Turns on logging of error function activity when passed to sqlsrv_configure() as a parameter.
SQLSRV_LOG_SEVERITY_ALL (integer): Specifies that errors, warnings, and notices will be logged when passed to sqlsrv_configure() as a parameter.
SQLSRV_LOG_SEVERITY_ERROR (integer): Specifies that errors will be logged when passed to sqlsrv_configure() as a parameter.
SQLSRV_LOG_SEVERITY_NOTICE (integer): Specifies that notices will be logged when passed to sqlsrv_configure() as a parameter.
SQLSRV_LOG_SEVERITY_WARNING (integer): Specifies that warnings will be logged when passed to sqlsrv_configure() as a parameter.
SQLSRV_NULLABLE_YES (integer): Indicates that a column is nullable.
SQLSRV_NULLABLE_NO (integer): Indicates that a column is not nullable.
SQLSRV_NULLABLE_UNKNOWN (integer): Indicates that it is not known if a column is nullable.
SQLSRV_PARAM_IN (integer): Indicates an input parameter when passed to sqlsrv_query() or sqlsrv_prepare().
SQLSRV_PARAM_INOUT (integer): Indicates a bidirectional parameter when passed to sqlsrv_query() or sqlsrv_prepare().
SQLSRV_PARAM_OUT (integer): Indicates an output parameter when passed to sqlsrv_query() or sqlsrv_prepare().
SQLSRV_PHPTYPE_INT (integer): Specifies an integer PHP data type. For usage information, see » How to: Specify PHP Types.
SQLSRV_PHPTYPE_DATETIME (integer): Specifies a datetime PHP data type. For usage information, see » How to: Specify PHP Types.
SQLSRV_PHPTYPE_FLOAT (integer): Specifies a float PHP data type. For usage information, see » How to: Specify PHP Types.
SQLSRV_PHPTYPE_STREAM (integer): Specifies a PHP stream. This constant works like a function and accepts an encoding constant. See the SQLSRV_ENC_* constants. For usage information, see » How to: Specify PHP Types.
SQLSRV_PHPTYPE_STRING (integer): Specifies a string PHP data type. This constant works like a function and accepts an encoding constant. See the SQLSRV_ENC_* constants. For usage information, see » How to: Specify PHP Types.
SQLSRV_ENC_BINARY (integer): Specifies that data is returned as a raw byte stream from the server without performing encoding or translation. For usage information, see » How to: Specify PHP Types.
SQLSRV_ENC_CHAR (integer): Data is returned in 8-bit characters as specified in the code page of the Windows locale that is set on the system. Any multi-byte characters or characters that do not map into this code page are substituted with a single byte question mark (?) character. This is the default encoding. For usage information, see » How to: Specify PHP Types.
UTF-8 (integer): Specifies that data is returned with UTF-8 encoding. For usage information, see » How to: Specify PHP Types.
SQLSRV_SQLTYPE_BIGINT (integer): Describes the bigint SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_BINARY (integer): Describes the binary SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_BIT (integer): Describes the bit SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_CHAR (integer): Describes the char SQL Server data type. This constant works like a function and accepts a parameter indicating the number characters. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_DATE (integer): Describes the date SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_DATETIME (integer): Describes the datetime SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_DATETIME2 (integer): Describes the datetime2 SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_DATETIMEOFFSET (integer): Describes the datetimeoffset SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_DECIMAL (integer): Describes the decimal SQL Server data type. This constant works like a function and accepts two parameters indicating (in order) precision and scale. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_FLOAT (integer): Describes the float SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_IMAGE (integer): Describes the image SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_INT (integer): Describes the int SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_MONEY (integer): Describes the money SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_NCHAR (integer): Describes the nchar SQL Server data type. This constant works like a function and accepts a single parameter indicating the character count. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_NUMERIC (integer): Describes the numeric SQL Server data type. This constant works like a function and accepts two parameter indicating (in order) precision and scale. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_NVARCHAR (integer): Describes the nvarchar SQL Server data type. This constant works like a function and accepts a single parameter indicating the character count. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_NVARCHAR('max') (integer): Describes the nvarchar(MAX) SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_NTEXT (integer): Describes the ntext SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_REAL (integer): Describes the real SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_SMALLDATETIME (integer): Describes the smalldatetime SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_SMALLINT (integer): Describes the smallint SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_SMALLMONEY (integer): Describes the smallmoney SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_TEXT (integer): Describes the text SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_TIME (integer): Describes the time SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_TIMESTAMP (integer): Describes the timestamp SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_TINYINT (integer): Describes the tinyint SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_UNIQUEIDENTIFIER (integer): Describes the uniqueidentifier SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_UDT (integer): Describes the UDT SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_VARBINARY (integer): Describes the varbinary SQL Server data type. This constant works like a function and accepts a single parameter indicating the byte count. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_VARBINARY('max') (integer): Describes the varbinary(MAX) SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_VARCHAR (integer): Describes the varchar SQL Server data type. This constant works like a function and accepts a single parameter indicating the character count. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_VARCHAR('max') (integer): Describes the varchar(MAX) SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_SQLTYPE_XML (integer): Describes the XML SQL Server data type. For usage information, see » How to: Specify SQL Types.
SQLSRV_TXN_READ_UNCOMMITTED (integer): Inidicates a transaction isolation level of READ UNCOMMITTED. This value is used to set the TransactionIsolation level in the $connectionOptions arrary passed to sqlsrv_connect().
SQLSRV_TXN_READ_COMMITTED (integer): Inidicates a transaction isolation level of READ COMMITTED. This value is used to set the TransactionIsolation level in the $connectionOptions arrary passed to sqlsrv_connect().
SQLSRV_TXN_REPEATABLE_READ (integer): Inidicates a transaction isolation level of REPEATABLE READ. This value is used to set the TransactionIsolation level in the $connectionOptions arrary passed to sqlsrv_connect().
SQLSRV_TXN_SNAPSHOT (integer): Inidicates a transaction isolation level of SNAPSHOT. This value is used to set the TransactionIsolation level in the $connectionOptions arrary passed to sqlsrv_connect().
SQLSRV_TXN_READ_SERIALIZABLE (integer): Inidicates a transaction isolation level of SERIALIZABLE. This value is used to set the TransactionIsolation level in the $connectionOptions arrary passed to sqlsrv_connect().
SQLSRV_CURSOR_FORWARD (integer): Inidicates a forward-only cursor. For usage information, see » Specifying a Cursor Type and Selecting Rows.
SQLSRV_CURSOR_STATIC (integer): Inidicates a static cursor. For usage information, see » Specifying a Cursor Type and Selecting Rows.
SQLSRV_CURSOR_DYNAMIC (integer): Inidicates a dynamic cursor. For usage information, see » Specifying a Cursor Type and Selecting Rows.
SQLSRV_CURSOR_KEYSET (integer): Inidicates a keyset cursor. For usage information, see » Specifying a Cursor Type and Selecting Rows.
SQLSRV_CURSOR_BUFFERED (integer): Creates a client-side cursor query. Lets you access rows in any order. For usage information, see » Specifying a Cursor Type and Selecting Rows.
SQLSRV_SCROLL_NEXT (integer): Specifies which row to select in a result set. For usage information, see » Specifying a Cursor Type and Selecting Rows.
SQLSRV_SCROLL_PRIOR (integer): Specifies which row to select in a result set. For usage information, see » Specifying a Cursor Type and Selecting Rows.
SQLSRV_SCROLL_FIRST (integer): Specifies which row to select in a result set. For usage information, see » Specifying a Cursor Type and Selecting Rows.
SQLSRV_SCROLL_LAST (integer): Specifies which row to select in a result set. For usage information, see » Specifying a Cursor Type and Selecting Rows.
SQLSRV_SCROLL_ABSOLUTE (integer): Specifies which row to select in a result set. For usage information, see » Specifying a Cursor Type and Selecting Rows.
SQLSRV_SCROLL_RELATIVE (integer): Specifies which row to select in a result set. For usage information, see » Specifying a Cursor Type and Selecting Rows.

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