time-nanosleep.xml

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<refentry xml:id="function.time-nanosleep" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>time_nanosleep</refname>
  <refpurpose>延缓执行若干秒和纳秒</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>array</type><type>bool</type></type><methodname>time_nanosleep</methodname>
   <methodparam><type>int</type><parameter>seconds</parameter></methodparam>
   <methodparam><type>int</type><parameter>nanoseconds</parameter></methodparam>
  </methodsynopsis>
  <para>
   程序延缓执行指定数量的 <parameter>seconds</parameter> 和 <parameter>nanoseconds</parameter>。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>seconds</parameter></term>
     <listitem>
      <para>
       必须是一个非负整数。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>nanoseconds</parameter></term>
     <listitem>
      <para>
       必须是一个小于1亿的非负整数。
      </para>
      <note>
       <simpara>
        在 Windows 上，系统的睡眠时间可能会超过指定的纳秒数，具体取决于硬件。
       </simpara>
      </note>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
  <para>
   如果延迟被中断，一个关联数组会返回，内容为：
   <itemizedlist>
    <listitem>
     <simpara>
      <literal>seconds</literal>——延迟剩余未执行的秒数
     </simpara>
    </listitem>
    <listitem>
     <simpara>
      <literal>nanoseconds</literal>——延迟剩余未执行的纳秒数
     </simpara>
    </listitem>
   </itemizedlist>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>time_nanosleep</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php
// 小心！如果返回数组，将无法按照预期工作
if (time_nanosleep(0, 500000000)) {
    echo "Slept for half a second.\n";
}

// 这个更好：
if (time_nanosleep(0, 500000000) === true) {
    echo "Slept for half a second.\n";
}

// 这个最好：
$nano = time_nanosleep(2, 100000);

if ($nano === true) {
    echo "Slept for 2 seconds, 100 microseconds.\n";
} elseif ($nano === false) {
    echo "Sleeping failed.\n";
} elseif (is_array($nano)) {
    $seconds = $nano['seconds'];
    $nanoseconds = $nano['nanoseconds'];
    echo "Interrupted by a signal.\n";
    echo "Time remaining: $seconds seconds, $nanoseconds nanoseconds.";
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>sleep</function></member>
    <member><function>usleep</function></member>
    <member><function>time_sleep_until</function></member>
    <member><function>set_time_limit</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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