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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.2 -->
<refentry xml:id="function.pg-field-is-null" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>pg_field_is_null</refname>
<refpurpose>Test if a field is SQL <literal>NULL</literal></refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>pg_field_is_null</methodname>
<methodparam><type>resource</type><parameter>result</parameter></methodparam>
<methodparam><type>int</type><parameter>row</parameter></methodparam>
<methodparam><type>mixed</type><parameter>field</parameter></methodparam>
</methodsynopsis>
<methodsynopsis>
<type>int</type><methodname>pg_field_is_null</methodname>
<methodparam><type>resource</type><parameter>result</parameter></methodparam>
<methodparam><type>mixed</type><parameter>field</parameter></methodparam>
</methodsynopsis>
<para>
<function>pg_field_is_null</function> tests if a field in a PostgreSQL
result resource is SQL <literal>NULL</literal> or not.
</para>
<note>
<para>
This function used to be called <function>pg_fieldisnull</function>.
</para>
</note>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>result</parameter></term>
<listitem>
<para>
PostgreSQL query result resource, returned by <function>pg_query</function>,
<function>pg_query_params</function> or <function>pg_execute</function>
(among others).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>row</parameter></term>
<listitem>
<para>
Row number in result to fetch. Rows are numbered from 0 upwards. If omitted,
current row is fetched.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>field</parameter></term>
<listitem>
<para>
Field number (starting from 0) as an <type>integer</type> or
the field name as a <type>string</type>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns <literal>1</literal> if the field in the given row is SQL <literal>NULL</literal>, <literal>0</literal>
if not. &false; is returned if the row is out of range, or upon any other error.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>pg_field_is_null</function> example</title>
<programlisting role="php">
<![CDATA[
<?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";
}
}
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
</refentry>
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