php-doc-en/reference/sam/SAMConnection/subscribe.xml
2018-01-25 15:34:22 +00:00

98 lines
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XML

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id='samconnection.subscribe' xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>SAMConnection::subscribe</refname>
<refpurpose>
Create a subscription to a specified topic
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>SAMConnection::subscribe</methodname>
<methodparam><type>string</type><parameter>targetTopic</parameter></methodparam>
</methodsynopsis>
<para>
The "subscribe" method is used to create a new subscription to a specified topic.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>targetTopic</parameter></term>
<listitem>
<para>
The identity of the topic (topic://topicname) to subscribe to.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
A subscription identifier that can be used in a subsequent receive call as
a selector to obtain any topic data or &false; if an error occurred. The
subscription identifier should be used in the receive call in place of the
simple topic name.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>Subscribe to a topic</title>
<programlisting role="php">
<![CDATA[
<?php
$subid = $conn->subscribe('topic://A');
if (!$subid) {
// The subscribe failed!
echo "Subscribe failed ($conn->errno) $conn->error";
}
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><xref linkend="samconnection.unsubscribe" /></member>
</simplelist>
</para>
</refsect1>
</refentry>
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