PHP Manual: pg_num

function pg_num_fields(PgSql\Result $result): int

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

Note:
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.

Version	Description
8.1.0	The `result` parameter expects an PgSql\Result instance now; previously, a resource was expected.

Example #1 pg_num_fields() example

<?php
$result = pg_query($conn, "SELECT 1, 2");

$num = pg_num_fields($result);

echo $num . " field(s) returned.\n";
?>

The above example will output:

2 field(s) returned.

pg_num_fields