<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Gets SQL NOTIFY message</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.pg-free-result.html">pg_free_result</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.pg-get-pid.html">pg_get_pid</a></div> <div class="up"><a href="ref.pgsql.html">PostgreSQL Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="function.pg-get-notify" class="refentry"> <div class="refnamediv"> <h1 class="refname">pg_get_notify</h1> <p class="verinfo">(PHP 4 >= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">pg_get_notify</span> — <span class="dc-title">Gets SQL NOTIFY message</span></p> </div> <div class="refsect1 description" id="refsect1-function.pg-get-notify-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">array</span> <span class="methodname"><strong>pg_get_notify</strong></span> ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$connection</code></span> [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$result_type</code></span> ] )</div> <p class="para rdfs-comment"> <span class="function"><strong>pg_get_notify()</strong></span> gets notifications generated by a <em>NOTIFY</em> SQL command. To receive notifications, the <em>LISTEN</em> SQL command must be issued. </p> </div> <div class="refsect1 parameters" id="refsect1-function.pg-get-notify-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> <dt> <span class="term"><em><code class="parameter">result_type</code></em></span> <dd> <p class="para"> An optional parameter that controls how the returned <span class="type"><a href="language.types.array.html" class="type array">array</a></span> is indexed. <em><code class="parameter">result_type</code></em> is a constant and can take the following values: <strong><code>PGSQL_ASSOC</code></strong>, <strong><code>PGSQL_NUM</code></strong> and <strong><code>PGSQL_BOTH</code></strong>. Using <strong><code>PGSQL_NUM</code></strong>, <span class="function"><strong>pg_get_notify()</strong></span> will return an array with numerical indices, using <strong><code>PGSQL_ASSOC</code></strong> it will return only associative indices while <strong><code>PGSQL_BOTH</code></strong>, the default, will return both numerical and associative indices. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-function.pg-get-notify-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> An <span class="type"><a href="language.types.array.html" class="type array">array</a></span> containing the <em>NOTIFY</em> message name and backend PID. Otherwise if no <em>NOTIFY</em> is waiting, then <strong><code>FALSE</code></strong> is returned. </p> </div> <div class="refsect1 examples" id="refsect1-function.pg-get-notify-examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example" id="example-2080"> <p><strong>Example #1 PostgreSQL NOTIFY message</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">// Listen 'author_updated' message from other processes<br /></span><span style="color: #0000BB">pg_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">, </span><span style="color: #DD0000">'LISTEN author_updated;'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$notify </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_get_notify</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$notify</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"No messages\n"</span><span style="color: #007700">;<br />} else {<br /> </span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$notify</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> </div> </p> </div> <div class="refsect1 seealso" id="refsect1-function.pg-get-notify-seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"> <span class="function"><a href="function.pg-get-pid.html" class="function" rel="rdfs-seeAlso">pg_get_pid()</a> - Gets the backend's process ID</span></li> </ul> </p> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.pg-free-result.html">pg_free_result</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.pg-get-pid.html">pg_get_pid</a></div> <div class="up"><a href="ref.pgsql.html">PostgreSQL Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>