# pg_num_fields

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_num_fields — Returns the number of fields in a result

### Descripción

pg_num_fields(PgSql\Result `$result`): int

pg_num_fields() returns the number of fields (columns) in the PgSql\Result instance.

> Nota:

> This function used to be called pg_numfields().

### Parámetros

`result`

  An PgSql\Result instance, returned by pg_query(), pg_query_params() or pg_execute()(among others).

### Valores devueltos

The number of fields (columns) in the result. On error, -1 is returned.

### Historial de cambios

Versión | Descripción
--- | ---
8.1.0 | The `result` parameter expects an PgSql\Result instance now; previously, a recurso was expected.

### Ejemplos

Ejemplo #1 pg_num_fields() example

`<?php
$result = pg_query($conn, "SELECT 1, 2");
$num = pg_num_fields($result);
echo $num . " field(s) returned.\n";
?>`

El resultado del ejemplo sería:

    2 field(s) returned.

### Ver también

- pg_num_rows() - Returns the number of rows in a result
- pg_affected_rows() - Devuelve el número de registros afectados (filas)