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<refentry xml:id="function.gettype" xmlns="http://docbook.org/ns/docbook">

<refnamediv>

<refname>gettype</refname>

<refpurpose>获取变量的类型</refpurpose>

</refnamediv>

<refsect1 role="description">

&reftitle.description;

<methodsynopsis>

<type>string</type><methodname>gettype</methodname>

<methodparam><type>mixed</type><parameter>value</parameter></methodparam>

</methodsynopsis>

<para>

返回 PHP <parameter>value</parameter> 变量的类型。

对于类型检查，请使用 <literal>is_*</literal> 函数。

</para>

</refsect1>

<refsect1 role="parameters">

&reftitle.parameters;

<para>

<variablelist>

<varlistentry>

<term><parameter>value</parameter></term>

<listitem>

<para>

要检查类型的变量。

</para>

</listitem>

</varlistentry>

</variablelist>

</para>

</refsect1>

<refsect1 role="returnvalues">

&reftitle.returnvalues;

<para>

返回字符串，可能值为：

<simplelist>

<member>

<literal>"boolean"</literal>

</member>

<member>

<literal>"integer"</literal>

</member>

<member>

<literal>"double"</literal>

（由于历史原因，如果是浮点型，则返回 <literal>"double"</literal>，而不仅仅是 <literal>"float"</literal>）

</member>

<member>

<literal>"string"</literal>

</member>

<member>

<literal>"array"</literal>

</member>

<member>

<literal>"object"</literal>

</member>

<member>

<literal>"resource"</literal>

</member>

<member>

<literal>"resource (closed)"</literal> 自 PHP 7.2.0 起

</member>

<member>

<literal>"NULL"</literal>

</member>

<member>

<literal>"unknown type"</literal>

</member>

</simplelist>

</para>

</refsect1>

<refsect1 role="changelog">

&reftitle.changelog;

<para>

<informaltable>

<tgroup cols="2">

<thead>

<row>

<entry>&Version;</entry>

<entry>&Description;</entry>

</row>

</thead>

<tbody>

<row>

<entry>7.2.0</entry>

<entry>

现在，已关闭的资源报告为 <literal>'resource (closed)'</literal>。此前，已关闭的资源报告为

<literal>'unknown type'</literal>。

</entry>

</row>

</tbody>

</tgroup>

</informaltable>

</para>

</refsect1>

<refsect1 role="examples">

&reftitle.examples;

<para>

<example>

<title><function>gettype</function> 示例</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>get_debug_type</function></member>

<member><function>settype</function></member>

<member><function>get_class</function></member>

<member><function>is_array</function></member>

<member><function>is_bool</function></member>

<member><function>is_callable</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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