(PHP 5 >= 5.1.0)
pg_field_type_oid — Returns the type ID (OID) for the corresponding field number
pg_field_type_oid() returns an integer containing the OID of the base type of the given field_number in the given PostgreSQL result resource.
You can get more information about the field type by querying PostgreSQL's pg_type system table using the OID obtained with this function. The PostgreSQL format_type() function will convert a type OID into an SQL standard type name.
If the field uses a PostgreSQL domain (rather than a basic type), it is the OID of the domain's underlying type that is returned, rather than the OID of the domain itself.
The OID of the field's base type. FALSE is returned on error.
Example #1 Getting information about fields 以上例程会输出：
$dbconn = pg_connect("dbname=publisher") or die("Could not connect");
// Assume 'title' is a varchar type
$res = pg_query($dbconn, "select title from authors where author = 'Orwell'");
echo "Title field type OID: ", pg_field_type_oid($res, 0);
Title field type OID: 1043
Example #1 Getting information about fields