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138 lines
5.5 KiB
HTML
138 lines
5.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>延缓执行</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.sleep" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">sleep</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">sleep</span> — <span class="dc-title">延缓执行</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.sleep-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>sleep</strong></span>
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( <span class="methodparam"><span class="type">int</span> <code class="parameter">$seconds</code></span>
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) : <span class="type">int</span></div>
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<p class="simpara">
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程序延迟执行指定的 <code class="parameter">seconds</code> 的秒数。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.sleep-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">seconds</code></dt>
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<dd>
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<p class="para">
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暂停的秒数。
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.sleep-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 0，错误时返回 <strong><code>FALSE</code></strong>。
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</p>
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<p class="para">
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如果函数的调用被一个信号中止，<span class="function"><strong>sleep()</strong></span> 会返回一个非零的值。在Windows上，该值总是 <em>192</em>（即Windows API常量<strong><code>WAIT_IO_COMPLETION</code></strong>的值）。其他平台上，该返回值是剩余未sleep的秒数。
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</p>
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</div>
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<div class="refsect1 errors" id="refsect1-function.sleep-errors">
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<h3 class="title">错误／异常</h3>
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<p class="para">
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如果指定的 <code class="parameter">seconds</code> 是负数，该函数会产生一个 <strong><code>E_WARNING</code></strong> 级别的错误。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.sleep-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.3.4</td>
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<td>
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在PHP 5.3.4之前，Windows平台下无论 <span class="function"><strong>sleep()</strong></span> 是否成功调用，总是会返回一个 <strong><code>NULL</code></strong>。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.sleep-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-4548">
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<p><strong>Example #1 <span class="function"><strong>sleep()</strong></span> 的例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">// current time<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">date</span><span style="color: #007700">(</span><span style="color: #DD0000">'h:i:s'</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// sleep for 10 seconds<br /></span><span style="color: #0000BB">sleep</span><span style="color: #007700">(</span><span style="color: #0000BB">10</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// wake up !<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">date</span><span style="color: #007700">(</span><span style="color: #DD0000">'h:i:s'</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>
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该例子会在休眠10秒后输出。
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</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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05:31:23
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05:31:33
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.sleep-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="usleep.html" class="function" rel="rdfs-seeAlso">usleep()</a> - 以指定的微秒数延迟执行</span></li>
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<li class="member"><span class="function"><a href="time_nanosleep.html" class="function" rel="rdfs-seeAlso">time_nanosleep()</a> - 延缓执行若干秒和纳秒</span></li>
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<li class="member"><span class="function"><a href="time_sleep_until.html" class="function" rel="rdfs-seeAlso">time_sleep_until()</a> - 使脚本睡眠到指定的时间为止。</span></li>
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<li class="member"><span class="function"><a href="set_time_limit.html" class="function" rel="rdfs-seeAlso">set_time_limit()</a> - 设置脚本最大执行时间</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |