<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >SAMConnection->isConnected()</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="PHP 手册" HREF="index.html"><LINK REL="UP" TITLE="SAM - Simple Asynchronous Messaging" HREF="ref.sam.html"><LINK REL="PREVIOUS" TITLE="SAMConnection->error" HREF="function.samconnection-error.html"><LINK REL="NEXT" TITLE="SAMConnection->peek()" HREF="function.samconnection-peek.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP 手册</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.samconnection-error.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.samconnection-peek.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.samconnection-isconnected" ></A >SAMConnection->isConnected()</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN200616" ></A ><P > (no version information, might be only in CVS)</P >SAMConnection->isConnected() -- Queries whether a connection is established to a Messaging Server </DIV ><DIV CLASS="refsect1" ><A NAME="AEN200619" ></A ><H2 >说明</H2 >class <B CLASS="classname" >SAMConnection</B > { <BR ></BR >bool <B CLASS="methodname" >isConnected</B > ( void )<BR ></BR >}<P > Calling the "isConnected" method on a Connection object will check whether the PHP script is connected to a messaging server. No messages can be sent or received unless a connection has been established with a Messaging server. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN200629" ></A ><H2 >返回值</H2 ><P > This method returns <TT CLASS="constant" ><B >TRUE</B ></TT > if the SAMConnection object is successfully connected to a Messaging server or <TT CLASS="constant" ><B >FALSE</B ></TT > otherwise. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN200634" ></A ><H2 >范例</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN200637" ></A ><P ><B >例 1. Checking whether there us a connection to a Messaging Server</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /><br /></font><font color="#007700">if (</font><font color="#0000BB">$conn</font><font color="#007700">-></font><font color="#0000BB">isConnected</font><font color="#007700">()) {<br /> echo </font><font color="#DD0000">'Connection is active.'<br /></font><font color="#007700">} else {<br /> echo </font><font color="#DD0000">'No active connection!'<br /></font><font color="#007700">}<br /><br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN200640" ></A ><H2 >参见</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.samconnection-disconnect.html" >SAMConnection->disconnect()</A ></TD ></TR ><TR ><TD ><A HREF="function.samconnection-connect.html" >SAMConnection->connect()</A ></TD ></TR ></TBODY ></TABLE ><P ></P > </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.samconnection-error.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >起始页</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.samconnection-peek.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >SAMConnection->error</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.sam.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >SAMConnection->peek()</TD ></TR ></TABLE ></DIV ></BODY ></HTML >