archived-doc-zh/reference/datetime/datetimezone/construct.xml

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<refentry xml:id="datetimezone.construct" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>DateTimeZone::__construct</refname>
  <refname>timezone_open</refname>
  <refpurpose>创建新的DateTimeZone对象</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <para>&style.oop;</para>
  <constructorsynopsis role="DateTimeZone">
   <modifier>public</modifier> <methodname>DateTimeZone::__construct</methodname>
   <methodparam><type>string</type><parameter>timezone</parameter></methodparam>
  </constructorsynopsis>
  <para>&style.procedural;</para>
  <methodsynopsis>
   <type class="union"><type>DateTimeZone</type><type>false</type></type><methodname>timezone_open</methodname>
   <methodparam><type>string</type><parameter>timezone</parameter></methodparam>
  </methodsynopsis>
  <para>
   创建新的 DateTimeZone 对象。
  </para>
  <para>
   DateTimeZone 对象提供了对三种不同类型的时区规则访问。UTC 时差（类型 <literal>1</literal>）、时区缩写（类型
   <literal>2</literal>）、IANA 时区数据库中公布的<link linkend="timezones">时区标识符</link>（类型 <literal>3</literal>）。
  </para>
  <para>
   DateTimeZone 对象可以附加到 <classname>DateTime</classname> 和 <classname>DateTimeImmutable</classname>
   对象上，以便能够在本地时区呈现这些对象所封装的时区。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>timezone</parameter></term>
     <listitem>
      <para>
       所支持的<link linkend="timezones">时区名</link>之一，时差（+0200）或时区缩写（BSD）。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   成功时返回 <classname>DateTimeZone</classname> 对象。
   &return.falseforfailure.style.procedural;
  </para>
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  <para>
   如果提供的时区不能识别为有效的时区，此方法将抛出 <exceptionname>DateInvalidTimeZoneException</exceptionname> 异常。在
   PHP 8.3 之前，是 <exceptionname>Exception</exceptionname>。
  </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>8.3.0</entry>
       <entry>
        无效值现在返回 <exceptionname>DateInvalidTimeZoneException</exceptionname>
        而不是生成 <exceptionname>Exception</exceptionname>。
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>创建 DateTimeZone 并附加到 DateTimeImmutable</title>
    <programlisting role="php">
<![CDATA[
<?php
$d = new DateTimeImmutable("2022-06-02 15:44:48 UTC");

$timezones = [ 'Europe/London', 'GMT+04:45', '-06:00', 'CEST' ];

foreach ($timezones as $tz) {
    $tzo = new DateTimeZone($tz);

    $local = $d->setTimezone($tzo);
    echo $local->format(DateTimeInterface::RFC2822 . ' — e') . "\n";
}
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Thu, 02 Jun 2022 16:44:48 +0100 — Europe/London
Thu, 02 Jun 2022 20:29:48 +0445 — +04:45
Thu, 02 Jun 2022 09:44:48 -0600 — -06:00
Thu, 02 Jun 2022 17:44:48 +0200 — CEST
]]>
    </screen>
   </example>
  </para>

  <para>
   <example>
    <title>实例化 <classname>DateTimeZone</classname> 时捕捉错误</title>
    <programlisting role="php">
<![CDATA[
<?php
// 通过捕获异常来处理错误
$timezones = array('Europe/London', 'Mars/Phobos', 'Jupiter/Europa');

foreach ($timezones as $tz) {
    try {
        $mars = new DateTimeZone($tz);
        echo $mars->getName() . "\n";
    } catch(Exception $e) {
        echo $e->getMessage() . "\n";
    }
}
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Europe/London
DateTimeZone::__construct() [datetimezone.--construct]: Unknown or bad timezone (Mars/Phobos)
DateTimeZone::__construct() [datetimezone.--construct]: Unknown or bad timezone (Jupiter/Europa)
]]>
    </screen>
   </example>
  </para>
 </refsect1>

</refentry>
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