php[world] 2019 — 25 years of PHP


(PHP 4 >= 4.2.0, PHP 5, PHP 7)

pg_field_is_nullTest if a field is SQL NULL


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

pg_field_is_null() tests if a field in a PostgreSQL result resource is SQL NULL or not.


This function used to be called pg_fieldisnull().



PostgreSQL query result resource, 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 integer or the field name as a string.

Dönen Değerler

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.


Örnek 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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