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<title>Constructs EvStat watcher object</title>
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<h1 class="refname">EvStat::__construct</h1>
<p class="verinfo">(PECL ev >= 0.2.0)</p><p class="refpurpose"><span class="refname">EvStat::__construct</span> — <span class="dc-title">Constructs EvStat watcher object</span></p>
</div>
<div class="refsect1 description" id="refsect1-evstat.construct-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span>
<span class="methodname"><strong>EvStat::__construct</strong></span>
( <span class="methodparam">
<span class="type">string</span>
<code class="parameter">$path</code>
</span>
, <span class="methodparam">
<span class="type">double</span>
<code class="parameter">$interval</code>
</span>
, <span class="methodparam">
<span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span>
<code class="parameter">$callback</code>
</span>
[, <span class="methodparam">
<span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span>
<code class="parameter">$data</code>
<span class="initializer"> = <strong><code>NULL</code></strong></span>
</span>
[, <span class="methodparam">
<span class="type">int</span>
<code class="parameter">$priority</code>
<span class="initializer"> = 0</span>
</span>
]] )</div>
<p class="para rdfs-comment">
Constructs EvStat watcher object and starts the watcher automatically.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-evstat.construct-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<span class="term">
<em><code class="parameter">path</code></em>
</span>
<dd>
<p class="para">
The path to wait for status changes on.
</p>
</dd>
</dt>
<dt>
<span class="term">
<em><code class="parameter">interval</code></em>
</span>
<dd>
<p class="para">
Hint on how quickly a change is expected to be detected and should
normally be specified as
<strong><code>0.0</code></strong>
to let
<em class="emphasis">libev</em>
choose a suitable value.
</p>
</dd>
</dt>
<dt>
<span class="term">
<em><code class="parameter">callback</code></em>
</span>
<dd>
<p class="para">
See
<a href="ev.watcher-callbacks.html" class="link">Watcher callbacks</a>
.
</p>
</dd>
</dt>
<dt>
<span class="term">
<em><code class="parameter">data</code></em>
</span>
<dd>
<p class="para">
Custom data associated with the watcher.
</p>
</dd>
</dt>
<dt>
<span class="term">
<em><code class="parameter">priority</code></em>
</span>
<dd>
<p class="para">
<a href="class.ev.html#ev.constants.watcher-pri" class="link">Watcher priority</a>
</p>
</dd>
</dt>
</dl>
</div>
<div class="refsect1 returnvalues" id="refsect1-evstat.construct-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns EvStat watcher object on succes.
</p>
</div>
<div class="refsect1 examples" id="refsect1-evstat.construct-examples">
<h3 class="title">Examples</h3>
<div class="example" id="example-3632">
<p><strong>Example #1 Monitor changes of /var/log/messages</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Use 10 second update interval.<br /></span><span style="color: #0000BB">$w </span><span style="color: #007700">= new </span><span style="color: #0000BB">EvStat</span><span style="color: #007700">(</span><span style="color: #DD0000">"/var/log/messages"</span><span style="color: #007700">, </span><span style="color: #0000BB">8</span><span style="color: #007700">, function (</span><span style="color: #0000BB">$w</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"/var/log/messages changed\n"</span><span style="color: #007700">;<br /><br /> </span><span style="color: #0000BB">$attr </span><span style="color: #007700">= </span><span style="color: #0000BB">$w</span><span style="color: #007700">-></span><span style="color: #0000BB">attr</span><span style="color: #007700">();<br /><br /> if (</span><span style="color: #0000BB">$attr</span><span style="color: #007700">[</span><span style="color: #DD0000">'nlink'</span><span style="color: #007700">]) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Current size: %ld\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$attr</span><span style="color: #007700">[</span><span style="color: #DD0000">'size'</span><span style="color: #007700">]);<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Current atime: %ld\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$attr</span><span style="color: #007700">[</span><span style="color: #DD0000">'atime'</span><span style="color: #007700">]);<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Current mtime: %ld\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$attr</span><span style="color: #007700">[</span><span style="color: #DD0000">'mtime'</span><span style="color: #007700">]);<br /> } else {<br /> </span><span style="color: #0000BB">fprintf</span><span style="color: #007700">(</span><span style="color: #0000BB">STDERR</span><span style="color: #007700">, </span><span style="color: #DD0000">"`messages` file is not there!"</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$w</span><span style="color: #007700">-></span><span style="color: #0000BB">stop</span><span style="color: #007700">();<br /> }<br />});<br /><br /></span><span style="color: #0000BB">Ev</span><span style="color: #007700">::</span><span style="color: #0000BB">run</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
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