ce561d19_sqlsrv_field_metadata___Manual_urned_by_sqlsrv_field_metadata_Key
[Description] An enumeration indicating whether the column is nullable, not nullable, or if it is not known. [Key] 
Nullable
N a m e
T y p e
S i z e
P r e c i s i o n
S c a l e
N u l l a b l e
PHP: sqlsrv_field_metadata - Manual
Key