预定义常量
下列常量由此扩展定义,且仅在此扩展编译入 PHP 或在运行时动态载入时可用。
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    MSSQL_ASSOC(integer)
- Return an associative array. Used on mssql_fetch_array()'s result_type parameter.
- 
    MSSQL_NUM(integer)
- Return an array with numeric keys. Used on mssql_fetch_array()'s result_type parameter.
- 
    MSSQL_BOTH(integer)
- Return an array with both numeric keys and keys with their field name. This is the default value for mssql_fetch_array()'s result_type parameter.
- 
    SQLTEXT(integer)
- Indicates the 'TEXT' type in MSSQL, used by mssql_bind()'s type parameter.
- 
    SQLVARCHAR(integer)
- Indicates the 'VARCHAR' type in MSSQL, used by mssql_bind()'s type parameter.
- 
    SQLCHAR(integer)
- Indicates the 'CHAR' type in MSSQL, used by mssql_bind()'s type parameter.
- 
    SQLINT1(integer)
- Represents one byte, with a range of -128 to 127.
- 
    SQLINT2(integer)
- Represents two bytes, with a range of -32768 to 32767.
- 
    SQLINT4(integer)
- Represents four bytes, with a range of -2147483648 to 2147483647.
- 
    SQLBIT(integer)
- Indicates the 'BIT' type in MSSQL, used by mssql_bind()'s type parameter.
- 
    SQLFLT4(integer)
- Represents an four byte float.
- 
    SQLFLT8(integer)
- Represents an eight byte float.