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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.12 $ -->
<refentry xml:id="function.gettype" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>gettype</refname>
<refpurpose>Get the type of a variable</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>gettype</methodname>
<methodparam><type>mixed</type><parameter>var</parameter></methodparam>
</methodsynopsis>
<para>
Returns the type of the PHP variable
<parameter>var</parameter>.
</para>
<warning>
<simpara>
Never use <function>gettype</function> to test for a certain type,
since the returned string may be subject to change in a future version.
In addition, it is slow too, as it involves string comparison.
</simpara>
<simpara>
Instead, use the <literal>is_*</literal> functions.
</simpara>
</warning>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>var</parameter></term>
<listitem>
<para>
The variable being type checked.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Possibles values for the returned string are:
<itemizedlist>
<listitem>
<simpara>
"<type>boolean</type>"
</simpara>
</listitem>
<listitem>
<simpara>
"<type>integer</type>"
</simpara>
</listitem>
<listitem>
<simpara>
"<type>double</type>" (for historical reasons "double" is
returned in case of a <type>float</type>, and not simply
"float")
</simpara>
</listitem>
<listitem>
<simpara>
"<type>string</type>"
</simpara>
</listitem>
<listitem>
<simpara>
"<type>array</type>"
</simpara>
</listitem>
<listitem>
<simpara>
"<type>object</type>"
</simpara>
</listitem>
<listitem>
<simpara>
"<type>resource</type>"
</simpara>
</listitem>
<listitem>
<simpara>
"<type>NULL</type>"
</simpara>
</listitem>
<listitem>
<simpara>
"unknown type"
</simpara>
</listitem>
</itemizedlist>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>gettype</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$data = array(1, 1., NULL, new stdClass, 'foo');
foreach ($data as $value) {
echo gettype($value), "\n";
}
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
integer
double
NULL
object
string
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>settype</function></member>
<member><function>is_array</function></member>
<member><function>is_bool</function></member>
<member><function>is_float</function></member>
<member><function>is_int</function></member>
<member><function>is_null</function></member>
<member><function>is_numeric</function></member>
<member><function>is_object</function></member>
<member><function>is_resource</function></member>
<member><function>is_scalar</function></member>
<member><function>is_string</function></member>
<member><function>function_exists</function></member>
<member><function>method_exists</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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