Source of: /manual/en/function.usleep.php
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<div id="function.usleep" class="refentry">
<div class="refnamediv">
<h1 class="refname">usleep</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">usleep</span> — <span class="dc-title">Delay execution in microseconds</span></p>
</div>
<a name="function.usleep.description"></a><div class="refsect1 description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type"><span class="type void">void</span></span> <span class="methodname"><b>usleep</b></span>
( <span class="methodparam"><span class="type">int</span> <tt class="parameter">$micro_seconds</tt></span>
)</div>
<p class="para rdfs-comment">
Delays program execution for the given number of micro seconds.
</p>
</div>
<a name="function.usleep.parameters"></a><div class="refsect1 parameters">
<h3 class="title">Parameters</h3>
<p class="para">
</p><dl>
<dt class="varlistentry">
<span class="term"><i><tt class="parameter">micro_seconds</tt></i>
</span>
</dt><dd class="listitem">
<p class="para">
Halt time in micro seconds. A micro second is one millionth of a
second.
</p>
</dd>
</dl>
<p>
</p>
</div>
<a name="function.usleep.returnvalues"></a><div class="refsect1 returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
No value is returned.
</p>
</div>
<a name="function.usleep.changelog"></a><div class="refsect1 changelog">
<h3 class="title">Changelog</h3>
<p class="para">
</p><table class="doctable informaltable">
<thead valign="middle">
<tr valign="middle">
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody valign="middle" class="tbody">
<tr valign="middle">
<td align="left">5.0.0</td>
<td align="left">
This function now works on Windows systems.
</td>
</tr>
</tbody>
</table>
<p>
</p>
</div>
<a name="function.usleep.examples"></a><div class="refsect1 examples">
<h3 class="title">Examples</h3>
<p class="para">
</p><div class="example">
<p><b>Example #1 <b>usleep()</b> example</b></p>
<div class="example-contents programlisting">
<div class="phpcode"><code><span style="color: #000000">
<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">// wait for 2 seconds<br /></span><span style="color: #0000BB">usleep</span><span style="color: #007700">(</span><span style="color: #0000BB">2000000</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// back!<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>
</span>
</code></div>
</div>
<div class="example-contents para"><p>The above example will output:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
11:13:28
11:13:30
</pre></div>
</div>
</div><p>
</p>
</div>
<a name="function.usleep.seealso"></a><div class="refsect1 seealso">
<h3 class="title">See Also</h3>
<p class="para">
</p><ul class="simplelist">
<li class="member"><a href="function.sleep.php" class="function" rel="rdfs-seeAlso">sleep()</a> - Delay execution</li>
<li class="member"><a href="function.time-nanosleep.php" class="function" rel="rdfs-seeAlso">time_nanosleep()</a> - Delay for a number of seconds and nanoseconds</li>
<li class="member"><a href="function.time-sleep-until.php" class="function" rel="rdfs-seeAlso">time_sleep_until()</a> - Make the script sleep until the specified time</li>
<li class="member"><a href="function.set-time-limit.php" class="function" rel="rdfs-seeAlso">set_time_limit()</a> - Limits the maximum execution time</li>
</ul><p>
</p>
</div>
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