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<h1 class="refname">pg_get_pid</h1>
<p class="verinfo">(PHP 4 >= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">pg_get_pid</span> — <span class="dc-title">Gets the backend's process ID</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.pg-get-pid-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>pg_get_pid</strong></span>
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$connection</code></span>
)</div>
<p class="para rdfs-comment">
<span class="function"><strong>pg_get_pid()</strong></span> gets the backend's (database server
process) PID. The PID is useful to determine whether or not a <em>NOTIFY</em>
message received via <span class="function"><a href="function.pg-get-notify.html" class="function">pg_get_notify()</a></span> is sent from another process
or not.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.pg-get-pid-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">connection</code></em></span>
<dd>
<p class="para">
PostgreSQL database connection resource.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.pg-get-pid-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
The backend database process ID.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.pg-get-pid-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-2081">
<p><strong>Example #1 PostgreSQL backend PID</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php <br />$conn </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_pconnect</span><span style="color: #007700">(</span><span style="color: #DD0000">"dbname=publisher"</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$conn</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"An error occurred.\n"</span><span style="color: #007700">;<br /> exit;<br />}<br /><br /></span><span style="color: #FF8000">// Backend process PID. Use PID with pg_get_notify()<br /></span><span style="color: #0000BB">$pid </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_get_pid</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.pg-get-pid-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.pg-get-notify.html" class="function" rel="rdfs-seeAlso">pg_get_notify()</a> - Gets SQL NOTIFY message</span></li>
</ul>
</p>
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