Returns precision of the column.
For FLOAT columns, precision is nonzero and scale is -127. If precision is 0, then column is NUMBER. Else it's NUMBER(precision, scale).
A valid OCI statement identifier.
Can be the field's index (1-based) or name.
Returns the precision as an integer, or false on failure
In PHP versions before 5.0.0 you must use ocicolumnprecision instead. This name still can be used, it was left as alias of oci_field_precision for downwards compatability. This, however, is deprecated and not recommended.