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

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().

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

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

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

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.