PHPerKaigi 2024

pg_field_is_null

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_field_is_nullTest if a field is SQL NULL

Description

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.

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";
}
}
?>

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