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pg_field_is_nullTest if a field is SQL NULL


pg_field_is_null(PgSql\Result $result, int $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().



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


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.

Valores devueltos

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.

Historial de cambios

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


Ejemplo #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 (
$res) {
      if (
pg_field_is_null($res0"year") == 1) {
"The value of the field year is null.\n";
      if (
pg_field_is_null($res0"year") == 0) {
"The value of the field year is not null.\n";

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