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pg_field_is_nullTest if a field is SQL NULL


pg_field_is_null(PgSql\Result $result, string|false|null $row, mixed $field): int
pg_field_is_null(PgSql\Result $result, mixed $field): int

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


This function used to be called pg_fieldisnull().



Uma instância de PgSql\Result, retornada por pg_query(), pg_query_params() ou pg_execute() (entre outras).


Row number in result to fetch. Rows are numbered from 0 upwards. If omitted, current row is fetched.


Field number (starting from 0) as an int or the field name as a string.

Valor Retornado

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.

Registro de Alterações

Versão Descrição
8.3.0 row is now nullable.
8.1.0 O parâmetro result agora espera uma instância de PgSql\Result; anteriormente, um resource era esperado.


Exemplo #1 pg_field_is_null() example

= 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) {
"The value of the field year is null.\n";
if (
pg_field_is_null($res, 0, "year") == 0) {
"The value of the field year is not null.\n";

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