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<h1 class="refname">AMQPQueue::nack</h1>
<p class="verinfo">(PECL amqp >= Unknown)</p><p class="refpurpose"><span class="refname">AMQPQueue::nack</span> — <span class="dc-title">Mark a message as explicitly not acknowledged.</span></p>
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<div class="refsect1 description" id="refsect1-amqpqueue.nack-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type"><span class="type void">void</span></span> <span class="methodname"><strong>AMQPQueue::nack</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$delivery_tag</code></span>
[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$flags</code><span class="initializer"> = <strong><code>AMQP_NOPARAM</code></strong></span></span>
] )</div>
<p class="para rdfs-comment">
Mark the message identified by <em><code class="parameter">delivery_tag</code></em> as explicitly not acknowledged. This method can only be called on messages that have not yet been acknowledged, meaning that messages retrieved with by <span class="methodname"><a href="amqpqueue.consume.html" class="methodname">AMQPQueue::consume()</a></span> and <span class="methodname"><a href="amqpqueue.get.html" class="methodname">AMQPQueue::get()</a></span> and using the <strong><code>AMQP_AUTOACK</code></strong> flag are not eligible.
</p>
<p class="para">
When called, the broker will immediately put the message back onto the queue, instead of waiting until the connection is closed.
</p>
<p class="para">
This method is only supported by the RabbitMQ broker. The behavior of calling this method while connected to any other broker is undefined.
</p>
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<div class="refsect1 parameters" id="refsect1-amqpqueue.nack-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<span class="term"><em><code class="parameter">delivery_tag</code></em></span>
<dd>
<p class="para">
The delivery tag by which to identify the message.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">flags</code></em></span>
<dd>
<p class="para">
A bitmask of flags.
</p>
</dd>
</dt>
</dl>
</div>
<div class="refsect1 errors" id="refsect1-amqpqueue.nack-errors">
<h3 class="title">Errors/Exceptions</h3>
<p class="para">
Throws <strong class="classname">AMQPChannelException</strong> if the channel is not open.
</p>
<p class="para">
Throws <strong class="classname">AMQPConnectionException</strong> if the connection to the broker was lost.
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-amqpqueue.nack-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>
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