Returns the length of field no.
The result resource that is being evaluated. This result comes from a call to mssql_query().
The field offset, starts at 0. If omitted, the current field is used.
Note to Win32 Users: Due to a limitation in the underlying API used by PHP (MS DbLib C API), the length of VARCHAR fields is limited to 255. If you need to store more data, use a TEXT field instead.