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

<refnamediv>

<refname>gmstrftime</refname>

<refpurpose>根据区域设置格式化 GMT/UTC 时间/日期</refpurpose>

</refnamediv>

<refsynopsisdiv>

&warn.deprecated.function-8-1-0.alternatives;

<simplelist role="alternatives">

<member><function>gmdate</function></member>

<member><methodname>IntlDateFormatter::format</methodname></member>

</simplelist>

</refsynopsisdiv>

<refsect1 role="description">

&reftitle.description;

<methodsynopsis>

<modifier role="attribute">#[\Deprecated]</modifier>

<type class="union"><type>string</type><type>false</type></type><methodname>gmstrftime</methodname>

<methodparam><type>string</type><parameter>format</parameter></methodparam>

<methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>timestamp</parameter><initializer>&null;</initializer></methodparam>

</methodsynopsis>

<para>

行为和 <function>strftime</function> 相同，只是返回的时间是格林威治标准时（GMT）。例如，在东部标准时（EST，GMT

-0500）运行时，下面第一行显示“Dec 31 1998 20:00:00”，而第二行显示“Jan 01 1999

01:00:00”。

</para>

<warning>

<para>

此函数依赖于操作系统区域设置信息，这些信息可能彼此不一致，或者根本不能用。而是使用

<methodname>IntlDateFormatter::format</methodname> 方法。

</para>

</warning>

</refsect1>

<refsect1 role="parameters">

&reftitle.parameters;

<para>

<variablelist>

<varlistentry>

<term><parameter>format</parameter></term>

<listitem>

<para>

See description in <function>strftime</function>.

</para>

</listitem>

</varlistentry>

&date.timestamp.description;

</variablelist>

</para>

</refsect1>

<refsect1 role="returnvalues">

&reftitle.returnvalues;

<para>

根据指定的格式字符串使用指定的 <parameter>timestamp</parameter>

或当前本地时间（若未提供时间戳）返回格式化的字符串。月份、星期名称及其他与语言相关的字符串遵循通过

<function>setlocale</function> 设置的当前区域。失败时返回 &false;。

</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>8.0.0</entry>

<entry>

现在 <parameter>timestamp</parameter> 允许为 null。

</entry>

</row>

</tbody>

</tgroup>

</informaltable>

</para>

</refsect1>

<refsect1 role="examples">

&reftitle.examples;

<para>

<example>

<title><function>gmstrftime</function> 示例</title>

<programlisting role="php">

<![CDATA[

<?php

setlocale(LC_TIME, 'en_US');

echo strftime("%b %d %Y %H:%M:%S", mktime(20, 0, 0, 12, 31, 98)) . "\n";

echo gmstrftime("%b %d %Y %H:%M:%S", mktime(20, 0, 0, 12, 31, 98)) . "\n";

]]>

</programlisting>

</example>

</para>

</refsect1>

<refsect1 role="seealso">

&reftitle.seealso;

<para>

<simplelist>

<member><methodname>IntlDateFormatter::format</methodname></member>

<member><methodname>DateTimeInterface::format</methodname></member>

<member><function>strftime</function></member>

</simplelist>

</para>

</refsect1>

</refentry>

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