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    2 => 'Checks the existence of a node in zookeeper synchronously',
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?>
<div id="zookeeper.exists" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">Zookeeper::exists</h1>
  <p class="verinfo">(PECL zookeeper &gt;= 0.1.0)</p><p class="refpurpose"><span class="refname">Zookeeper::exists</span> &mdash; <span class="dc-title">Checks the existence of a node in zookeeper synchronously</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-zookeeper.exists-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span>
   <span class="methodname"><strong>Zookeeper::exists</strong></span>(<span class="methodparam"><span class="type"><a href="language.types.string.php" class="type string">string</a></span> <code class="parameter">$path</code></span>, <span class="methodparam"><span class="type"><a href="language.types.callable.php" class="type callable">callable</a></span> <code class="parameter">$watcher_cb</code><span class="initializer"> = <strong><code><a href="reserved.constants.php#constant.null">null</a></code></strong></span></span>): <span class="type"><a href="language.types.array.php" class="type array">array</a></span></div>

 </div>


 <div class="refsect1 parameters" id="refsect1-zookeeper.exists-parameters">
  <h3 class="title">参数</h3>
  <dl>
   
    <dt><code class="parameter">path</code></dt>
    <dd>
     <p class="para">
      The name of the node. Expressed as a file name with slashes separating ancestors of the node.
     </p>
    </dd>
   
   
    <dt><code class="parameter">watcher_cb</code></dt>
    <dd>
     <p class="para">
      if nonzero, a watch will be set at the server to notify the client if the node changes. The watch will be set even if the node does not
     </p>
    </dd>
   
  </dl>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-zookeeper.exists-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns the value of stat for the path if the given node exists, otherwise false.
  </p>
 </div>


 <div class="refsect1 errors" id="refsect1-zookeeper.exists-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   This method emits PHP error/warning when parameters count or types are wrong or fail to check the existence of a node.
  </p>
  <div class="caution"><strong class="caution">警告</strong>
    <p class="para">
      Since version 0.3.0, this method emits <span class="classname"><a href="class.zookeeperexception.php" class="classname">ZookeeperException</a></span> and it&#039;s derivatives.
    </p>
  </div>
 </div>


 <div class="refsect1 examples" id="refsect1-zookeeper.exists-examples">
  <h3 class="title">示例</h3>
  <div class="example" id="zookeeper.exists.example.basic">
   <p><strong>示例 #1 <span class="methodname"><strong>Zookeeper::exists()</strong></span> example</strong></p>
   <div class="example-contents"><p>
     Check the existence of a node.
   </p></div>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br />$zookeeper </span><span style="color: #007700">= new </span><span style="color: #0000BB">Zookeeper</span><span style="color: #007700">(</span><span style="color: #DD0000">'locahost:2181'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$path </span><span style="color: #007700">= </span><span style="color: #DD0000">'/path/to/node'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$r </span><span style="color: #007700">= </span><span style="color: #0000BB">$zookeeper</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">exists</span><span style="color: #007700">(</span><span style="color: #0000BB">$path</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">$r</span><span style="color: #007700">)<br />  echo </span><span style="color: #DD0000">'EXISTS'</span><span style="color: #007700">;<br />else<br />  echo </span><span style="color: #DD0000">'N/A or ERR'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span></span></code></div>
   </div>

   <div class="example-contents"><p>以上示例会输出：</p></div>
   <div class="example-contents screen">
<div class="examplescode"><pre class="examplescode">EXISTS</pre>
</div>
   </div>
  </div>
 </div>


 <div class="refsect1 seealso" id="refsect1-zookeeper.exists-seealso">
  <h3 class="title">参见</h3>
  <ul class="simplelist">
   <li><span class="methodname"><a href="zookeeper.get.php" class="methodname" rel="rdfs-seeAlso">Zookeeper::get()</a> - Gets the data associated with a node synchronously</span></li>
   <li><span class="classname"><a href="class.zookeeperexception.php" class="classname">ZookeeperException</a></span></li>
  </ul>
 </div>


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