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Test if a field is SQL NULL (PHP 4 >= 4.2.0, PHP 5)
int pg_field_is_null ( resource result, int row, mixed field )
int pg_field_is_null ( resource result, mixed field )

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.

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.


Example 1926. 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";