<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >mysql_ping</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="MySQL 函数" HREF="ref.mysql.html"><LINK REL="PREVIOUS" TITLE="mysql_pconnect" HREF="function.mysql-pconnect.html"><LINK REL="NEXT" TITLE="mysql_query" HREF="function.mysql-query.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.mysql-pconnect.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.mysql-query.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.mysql-ping" ></A >mysql_ping</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN136229" ></A ><P > (PHP 4 >= 4.3.0, PHP 5)</P >mysql_ping -- Ping 一个服务器连接,如果没有连接则重新连接</DIV ><DIV CLASS="refsect1" ><A NAME="AEN136232" ></A ><H2 >说明</H2 >bool <B CLASS="methodname" >mysql_ping</B > ( [resource link_identifier] )<BR ></BR ><P > <B CLASS="function" >mysql_ping()</B > 检查到服务器的连接是否正常。如果断开,则自动尝试连接。本函数可用于空闲很久的脚本来检查服务器是否关闭了连接,如果有必要则重新连接上。如果到服务器的连接可用则 <B CLASS="function" >mysql_ping()</B > 返回 <TT CLASS="constant" ><B >TRUE</B ></TT >,否则返回 <TT CLASS="constant" ><B >FALSE</B ></TT >。 </P ><P > 参见 <A HREF="function.mysql-thread-id.html" ><B CLASS="function" >mysql_thread_id()</B ></A > 和 <A HREF="function.mysql-list-processes.html" ><B CLASS="function" >mysql_list_processes()</B ></A >。 </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.mysql-pconnect.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.mysql-query.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >mysql_pconnect</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.mysql.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >mysql_query</TD ></TR ></TABLE ></DIV ></BODY ></HTML >