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# pg_field_is_null

(PHP 4 >= 4.2.0, PHP 5)

pg_field_is_null -- Test if a field is `NULL`

## Description

int pg_field_is_null ( resource result, int row, mixed field)

pg_field_is_null() tests if a field is `NULL` or not. It returns 1 if the field in the given row is `NULL`. It returns 0 if the field in the given row is NOT `NULL`. Field can be specified as column index (number) or fieldname (string). Row numbering starts at 0.

示範 1.pg_field_is_null() example
`<?php $dbconn = pg_connect("dbname=publisher") or die ("Could not connect"); $res = pg_query($dbconn, "select * from authors where author = 'Orwell'"); if ($res) { if (pg_field_is_null($res, 0, "year") == 1) { echo "The value of the field year is null.\n"; } if (pg_field_is_null($res, 0, "year") == 0) { echo "The value of the field year is not null.\n"; } } ?>`

> 備注: This function used to be called pg_fieldisnull().

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