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<title>Collect references to completed tasks</title>
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<h1 class="refname">Pool::collect</h1>
<p class="verinfo">(PECL pthreads >= 2.0.0)</p><p class="refpurpose"><span class="refname">Pool::collect</span> — <span class="dc-title">Collect references to completed tasks</span></p>
</div>
<div class="refsect1 description" id="refsect1-pool.collect-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">int</span> <span class="methodname"><strong>Pool::collect</strong></span>
([ <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type Callable">Callable</a></span> <code class="parameter">$collector</code></span>
] )</div>
<p class="para rdfs-comment">
Allows the pool to collect references determined to be garbage by the
optionally given collector.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-pool.collect-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<code class="parameter">collector</code></dt>
<dd>
<p class="para">
A Callable collector that returns a boolean on whether the task can be
collected or not. Only in rare cases should a custom collector need to
be used.
</p>
</dd>
</dl>
</div>
<div class="refsect1 returnvalues" id="refsect1-pool.collect-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
The number of remaining tasks in the pool to be collected.
</p>
</div>
<div class="refsect1 changelog" id="refsect1-pool.collect-changelog">
<h3 class="title">Changelog</h3>
<p class="para">
<table class="doctable informaltable">
<thead>
<tr>
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>v3</td>
<td>
An integer is now returned, and the <code class="parameter">collector</code>
parameter is now optional.
</td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 examples" id="refsect1-pool.collect-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-4529">
<p><strong>Example #1 A basic example of <span class="methodname"><strong>Pool::collect()</strong></span></strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$pool </span><span style="color: #007700">= new </span><span style="color: #0000BB">Pool</span><span style="color: #007700">(</span><span style="color: #0000BB">4</span><span style="color: #007700">);<br /><br />for (</span><span style="color: #0000BB">$i </span><span style="color: #007700">= </span><span style="color: #0000BB">0</span><span style="color: #007700">; </span><span style="color: #0000BB">$i </span><span style="color: #007700">< </span><span style="color: #0000BB">15</span><span style="color: #007700">; ++</span><span style="color: #0000BB">$i</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$pool</span><span style="color: #007700">-></span><span style="color: #0000BB">submit</span><span style="color: #007700">(new class extends </span><span style="color: #0000BB">Threaded </span><span style="color: #007700">{});<br />}<br /><br />while (</span><span style="color: #0000BB">$pool</span><span style="color: #007700">-></span><span style="color: #0000BB">collect</span><span style="color: #007700">()); </span><span style="color: #FF8000">// blocks until all tasks have finished executing<br /><br /></span><span style="color: #0000BB">$pool</span><span style="color: #007700">-></span><span style="color: #0000BB">shutdown</span><span style="color: #007700">();</span>
</span>
</code></div>
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