📄 function.samconnection-subscribe.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Create a subscription to a specified topic.</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.samconnection-setDebug.html">SAMConnection::setDebug</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.samconnection-unsubscribe.html">SAMConnection->unsubscribe</a></div> <div class="up"><a href="ref.sam.html">SAM Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.samconnection-subscribe" class="refentry"> <div class="refnamediv"> <h1 class="refname">SAMConnection->subscribe</h1> <p class="verinfo">(No version information available, might be only in CVS)</p><p class="refpurpose"><span class="refname">SAMConnection->subscribe</span> — <span class="dc-title"> Create a subscription to a specified topic. </span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="classsynopsis"> <div class="ooclass"><b class="classname">SAMConnection</b></div> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>subscribe</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$targetTopic</tt></span> )</div> </div> <p class="para"> The "subscribe" method is used to create a new subscription to a specified topic. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">targetTopic</tt></i></span> <dd> <p class="para"> The identity of the topic (topic://topicname) to subscribe to. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> A subscription identifier that can be used in a subsequent receive call as a selector to obtain any topic data or <b><tt>FALSE</tt></b> if an error occurred. The subscription identifier should be used in the receive call in place of the simple topic name. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 Subscribe to a topic</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$subid </span><span style="color: #007700">= </span><span style="color: #0000BB">$conn</span><span style="color: #007700">-></span><span style="color: #0000BB">subscribe</span><span style="color: #007700">(</span><span style="color: #DD0000">'topic://A'</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$subid</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">// The subscribe failed!<br /> </span><span style="color: #007700">echo </span><span style="color: #DD0000">"Subscribe failed ($conn->errno) $conn->error"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.samconnection-unsubscribe.html" class="xref">SAMConnection->unsubscribe</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.samconnection-setDebug.html">SAMConnection::setDebug</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.samconnection-unsubscribe.html">SAMConnection->unsubscribe</a></div> <div class="up"><a href="ref.sam.html">SAM Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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