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  <title>Examples</title>

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</div><hr /><div id="libevent.examples" class="chapter">
 <h1>Examples</h1>

 <p class="para">
  <div class="example" id="example-3640">
   <p><strong>Example #1 polling <strong><code>STDIN</code></strong> using basic API</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #007700">function&nbsp;</span><span style="color: #0000BB">print_line</span><span style="color: #007700">(</span><span style="color: #0000BB">$fd</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$events</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$arg</span><span style="color: #007700">)<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;static&nbsp;</span><span style="color: #0000BB">$max_requests&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">;<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$max_requests</span><span style="color: #007700">++;<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(</span><span style="color: #0000BB">$max_requests&nbsp;</span><span style="color: #007700">==&nbsp;</span><span style="color: #0000BB">10</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;exit&nbsp;loop&nbsp;after&nbsp;10&nbsp;writes<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">event_base_loopexit</span><span style="color: #007700">(</span><span style="color: #0000BB">$arg</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]);<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;print&nbsp;the&nbsp;line<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">echo&nbsp;&nbsp;</span><span style="color: #0000BB">fgets</span><span style="color: #007700">(</span><span style="color: #0000BB">$fd</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">//&nbsp;create&nbsp;base&nbsp;and&nbsp;event<br /></span><span style="color: #0000BB">$base&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">event_base_new</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$event&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">event_new</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">$fd&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">STDIN</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">//&nbsp;set&nbsp;event&nbsp;flags<br /></span><span style="color: #0000BB">event_set</span><span style="color: #007700">(</span><span style="color: #0000BB">$event</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$fd</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">EV_READ&nbsp;</span><span style="color: #007700">|&nbsp;</span><span style="color: #0000BB">EV_PERSIST</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"print_line"</span><span style="color: #007700">,&nbsp;array(</span><span style="color: #0000BB">$event</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$base</span><span style="color: #007700">));<br /></span><span style="color: #FF8000">//&nbsp;set&nbsp;event&nbsp;base<br /></span><span style="color: #0000BB">event_base_set</span><span style="color: #007700">(</span><span style="color: #0000BB">$event</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$base</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;enable&nbsp;event<br /></span><span style="color: #0000BB">event_add</span><span style="color: #007700">(</span><span style="color: #0000BB">$event</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">//&nbsp;start&nbsp;event&nbsp;loop<br /></span><span style="color: #0000BB">event_base_loop</span><span style="color: #007700">(</span><span style="color: #0000BB">$base</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

  </div>
 </p>
 <p class="para">
  <div class="example" id="example-3641">
   <p><strong>Example #2 polling <strong><code>STDIN</code></strong> using buffered event API</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #007700">function&nbsp;</span><span style="color: #0000BB">print_line</span><span style="color: #007700">(</span><span style="color: #0000BB">$buf</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$arg</span><span style="color: #007700">)<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;static&nbsp;</span><span style="color: #0000BB">$max_requests</span><span style="color: #007700">;<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$max_requests</span><span style="color: #007700">++;<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(</span><span style="color: #0000BB">$max_requests&nbsp;</span><span style="color: #007700">==&nbsp;</span><span style="color: #0000BB">10</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">event_base_loopexit</span><span style="color: #007700">(</span><span style="color: #0000BB">$arg</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;print&nbsp;the&nbsp;line<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">event_buffer_read</span><span style="color: #007700">(</span><span style="color: #0000BB">$buf</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">4096</span><span style="color: #007700">);<br />}<br /><br />function&nbsp;</span><span style="color: #0000BB">error_func</span><span style="color: #007700">(</span><span style="color: #0000BB">$buf</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$what</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$arg</span><span style="color: #007700">)<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;handle&nbsp;errors<br /></span><span style="color: #007700">}<br /><br /></span><span style="color: #0000BB">$base&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">event_base_new</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$eb&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">event_buffer_new</span><span style="color: #007700">(</span><span style="color: #0000BB">STDIN</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"print_line"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">NULL</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"error_func"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$base</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">event_buffer_base_set</span><span style="color: #007700">(</span><span style="color: #0000BB">$eb</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$base</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">event_buffer_enable</span><span style="color: #007700">(</span><span style="color: #0000BB">$eb</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">EV_READ</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">event_base_loop</span><span style="color: #007700">(</span><span style="color: #0000BB">$base</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
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