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<h1 class="refname">Zookeeper::setWatcher</h1>
<p class="verinfo">(PECL zookeeper >= 0.1.0)</p><p class="refpurpose"><span class="refname">Zookeeper::setWatcher</span> — <span class="dc-title">Set a watcher function</span></p>
</div>
<div class="refsect1 description" id="refsect1-zookeeper.setwatcher-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span>
<span class="type">bool</span> <span class="methodname"><strong>Zookeeper::setWatcher</strong></span>
( <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$watcher_cb</code></span>
)</div>
</div>
<div class="refsect1 parameters" id="refsect1-zookeeper.setwatcher-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<code class="parameter">watcher_cb</code></dt>
<dd>
<p class="para">
A watch will be set at the server to notify the client if the node changes.
</p>
</dd>
</dl>
</div>
<div class="refsect1 returnvalues" id="refsect1-zookeeper.setwatcher-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns <strong><code>TRUE</code></strong> on success or <strong><code>FALSE</code></strong> on failure.
</p>
</div>
<div class="refsect1 errors" id="refsect1-zookeeper.setwatcher-errors">
<h3 class="title">Errors/Exceptions</h3>
<p class="para">
This method emits PHP error/warning when parameters count or types are wrong or fail to set watcher.
</p>
<div class="caution"><strong class="caution">Caution</strong>
<p class="para">
Since version 0.3.0, this method emits <strong class="classname">ZookeeperException</strong> and it's derivatives.
</p>
</div>
</div>
<div class="refsect1 seealso" id="refsect1-zookeeper.setwatcher-seealso">
<h3 class="title">See Also</h3>
<ul class="simplelist">
<li class="member"><span class="methodname"><a href="zookeeper.exists.html" class="methodname" rel="rdfs-seeAlso">Zookeeper::exists()</a> - Checks the existence of a node in zookeeper synchronously</span></li>
<li class="member"><span class="methodname"><a href="zookeeper.get.html" class="methodname" rel="rdfs-seeAlso">Zookeeper::get()</a> - Gets the data associated with a node synchronously</span></li>
<li class="member"><strong class="classname">ZookeeperException</strong></li>
</ul>
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