PHP_FUNCTION(pg_result_error_field)
{
	zval *result;
	long fieldcode;
	PGresult *pgsql_result;
	pgsql_result_handle *pg_result;
	char *field = NULL;

	if (zend_parse_parameters_ex(ZEND_PARSE_PARAMS_QUIET, ZEND_NUM_ARGS() TSRMLS_CC, "rl",
								 &result, &fieldcode) == FAILURE) {
		RETURN_FALSE;
	}
	
	ZEND_FETCH_RESOURCE(pg_result, pgsql_result_handle *, &result, -1, "PostgreSQL result", le_result);

	pgsql_result = pg_result->result;
	if (!pgsql_result) {
		RETURN_FALSE;
	}
	if (fieldcode & (PG_DIAG_SEVERITY|PG_DIAG_SQLSTATE|PG_DIAG_MESSAGE_PRIMARY|PG_DIAG_MESSAGE_DETAIL
				|PG_DIAG_MESSAGE_HINT|PG_DIAG_STATEMENT_POSITION
#if PG_DIAG_INTERNAL_POSITION
				|PG_DIAG_INTERNAL_POSITION
#endif
#if PG_DIAG_INTERNAL_QUERY
				|PG_DIAG_INTERNAL_QUERY
#endif
				|PG_DIAG_CONTEXT|PG_DIAG_SOURCE_FILE|PG_DIAG_SOURCE_LINE
				|PG_DIAG_SOURCE_FUNCTION)) {
		field = (char *)PQresultErrorField(pgsql_result, fieldcode);
		if (field == NULL) {
			RETURN_NULL();
		} else {
			RETURN_STRING(field, 1);
		}
	} else {
		RETURN_FALSE;
	}
}

Unknown