PHP Manual: Test if a field is SQL NULL

Description

int pg_field_is_null(PgSql\Result $result, stringfalsenull $row, mixed $field)

int pg_field_is_null(PgSql\Result $result, mixed $field)

pg_field_is_null tests if a field in an PgSql\Result instance is SQL NULL or not.

Note:
This function used to be called pg_fieldisnull.

Parameters

result: An PgSql\Result instance, returned by pg_query, pg_query_params or pg_execute(among others).
row: Row number in result to fetch. Rows are numbered from 0 upwards. If omitted, current row is fetched.
field: Field number (starting from 0) as an int or the field name as a string.

Return Values

Returns 1 if the field in the given row is SQL NULL, 0 if not. false is returned if the row is out of range, or upon any other error.

Changelog

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

Examples

Example #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";
    }
 }
?>