mirror of
https://github.com/php/doc-zh.git
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mowangjuanzi
229 lines
7.0 KiB
XML
229 lines
7.0 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 3a8c3e77df070a046c9d5b56b68926ca2d7e5ee3 Maintainer: mowangjuanzi Status: ready -->
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<!-- CREDITS: Luffy -->
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<refentry xml:id="datetime.diff" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<refnamediv>
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<refname>DateTimeInterface::diff</refname>
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<refname>DateTimeImmutable::diff</refname>
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<refname>DateTime::diff</refname>
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<refname>date_diff</refname>
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<refpurpose>返回两个 DateTime 之间的差值</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<para>&style.oop;</para>
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<methodsynopsis role="DateTimeInterface">
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<modifier>public</modifier> <type>DateInterval</type><methodname>DateTimeInterface::diff</methodname>
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<methodparam><type>DateTimeInterface</type><parameter>targetObject</parameter></methodparam>
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<methodparam choice="opt"><type>bool</type><parameter>absolute</parameter><initializer>&false;</initializer></methodparam>
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</methodsynopsis>
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<methodsynopsis role="DateTimeImmutable">
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<modifier>public</modifier> <type>DateInterval</type><methodname>DateTimeImmutable::diff</methodname>
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<methodparam><type>DateTimeInterface</type><parameter>targetObject</parameter></methodparam>
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<methodparam choice="opt"><type>bool</type><parameter>absolute</parameter><initializer>&false;</initializer></methodparam>
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</methodsynopsis>
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<methodsynopsis role="DateTime">
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<modifier>public</modifier> <type>DateInterval</type><methodname>DateTime::diff</methodname>
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<methodparam><type>DateTimeInterface</type><parameter>targetObject</parameter></methodparam>
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<methodparam choice="opt"><type>bool</type><parameter>absolute</parameter><initializer>&false;</initializer></methodparam>
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</methodsynopsis>
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<para>&style.procedural;</para>
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<methodsynopsis>
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<type>DateInterval</type><methodname>date_diff</methodname>
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<methodparam><type>DateTimeInterface</type><parameter>baseObject</parameter></methodparam>
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<methodparam><type>DateTimeInterface</type><parameter>targetObject</parameter></methodparam>
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<methodparam choice="opt"><type>bool</type><parameter>absolute</parameter><initializer>&false;</initializer></methodparam>
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</methodsynopsis>
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<para>
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返回两个 <classname>DateTimeInterface</classname> 对象的差值。
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<variablelist>
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<varlistentry>
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<term><parameter>datetime</parameter></term>
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<listitem>
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<para>
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要比较的日期。
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>absolute</parameter></term>
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<listitem>
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<para>
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间隔是否强制为正的？
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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<classname>DateInterval</classname> 对象表示两个日期之间的差值。
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</para>
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<para>
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<parameter>absolute</parameter> 参数只影响 <classname>DateInterval</classname> 对象的
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<parameter>invert</parameter> 属性。
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</para>
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<para>
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返回更具体的表示应用于原始对象（<parameter>$this</parameter> 或
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<parameter>$originObject</parameter>）到达 <parameter>$targetObject</parameter>
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的时钟时间间隔的值。该过程始终不可逆。
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</para>
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<para>
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该方法知道 DST 转换，因此可以根据示例返回 <literal>24 小时 30
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分钟</literal>的时间间隔。如果想使用绝对时间计算，则需要先将
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<parameter>$this</parameter>/<parameter>$baseObject</parameter> 和
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<parameter>$targetObject</parameter> 都转换为 UTC。
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<example>
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<title><function>DateTimeImmutable::diff</function> 示例</title>
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<para>&style.oop;</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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$origin = new DateTimeImmutable('2009-10-11');
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$target = new DateTimeImmutable('2009-10-13');
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$interval = $origin->diff($target);
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echo $interval->format('%R%a days');
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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+2 days
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]]>
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</screen>
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<para>&style.procedural;</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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$origin = date_create('2009-10-11');
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$target = date_create('2009-10-13');
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$interval = date_diff($origin, $target);
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echo $interval->format('%R%a days');
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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+2 days
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]]>
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</screen>
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</example>
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<example>
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<title>DST 转换期间的 <methodname>DateTimeInterface::diff</methodname></title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$originalTime = new DateTimeImmutable("2021-10-30 09:00:00 Europe/London");
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$targetTime = new DateTimeImmutable("2021-10-31 08:30:00 Europe/London");
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$interval = $originalTime->diff($targetTime);
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echo $interval->format("%H:%I:%S (Full days: %a)"), "\n";
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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24:30:00 (Full days: 0)
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]]>
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</screen>
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</example>
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<example>
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<title><methodname>DateTimeInterface::diff</methodname> range</title>
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<para>
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该方法返回的值是从 <parameter>$this</parameter> 到达 <parameter>$targetObject</parameter>
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所需要的精确时间。因此，将 1 月 1 日与 12 月 31 日进行比较，返回的结果是 364，而不是
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365 天（对于非闰年）。
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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$originalTime = new DateTimeImmutable("2023-01-01 UTC");
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$targetTime = new DateTimeImmutable("2023-12-31 UTC");
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$interval = $originalTime->diff($targetTime);
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echo "Full days: ", $interval->format("%a"), "\n";
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Full days: 364
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]]>
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</screen>
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</example>
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<example>
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<title><classname>DateTime</classname> 对象比较</title>
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<note>
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<para>
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<classname>DateTimeImmutable</classname> 和 <classname>DateTime</classname>
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对象可以使用<link linkend="language.operators.comparison">比较运算符</link>进行比较。
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</para>
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</note>
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<programlisting role="php">
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<![CDATA[
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<?php
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$date1 = new DateTime("now");
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$date2 = new DateTime("tomorrow");
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var_dump($date1 == $date2);
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var_dump($date1 < $date2);
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var_dump($date1 > $date2);
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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bool(false)
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bool(true)
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bool(false)
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]]>
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</screen>
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</example>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<simplelist>
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<member><function>DateInterval::format</function></member>
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<member><function>DateTime::add</function></member>
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<member><function>DateTime::sub</function></member>
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</simplelist>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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