<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >gethostbyaddr</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="Network Functions" HREF="ref.network.html"><LINK REL="PREVIOUS" TITLE="fsockopen" HREF="function.fsockopen.html"><LINK REL="NEXT" TITLE="gethostbyname" HREF="function.gethostbyname.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.fsockopen.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.gethostbyname.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.gethostbyaddr" ></A >gethostbyaddr</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN149077" ></A ><P > (PHP 3, PHP 4, PHP 5)</P >gethostbyaddr -- Get the Internet host name corresponding to a given IP address </DIV ><DIV CLASS="refsect1" ><A NAME="AEN149080" ></A ><H2 >说明</H2 >string <B CLASS="methodname" >gethostbyaddr</B > ( string ip_address )<BR ></BR ><P > Returns the host name of the Internet host specified by <CODE CLASS="parameter" >ip_address</CODE > or a string containing the unmodified <CODE CLASS="parameter" >ip_address</CODE > on failure. </P ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN149092" ></A ><P ><B >例 1. A simple <B CLASS="function" >gethostbyaddr()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$hostname </font><font color="#007700">= </font><font color="#0000BB">gethostbyaddr</font><font color="#007700">(</font><font color="#0000BB">$_SERVER</font><font color="#007700">[</font><font color="#DD0000">'REMOTE_ADDR'</font><font color="#007700">]);<br /><br />echo </font><font color="#0000BB">$hostname</font><font color="#007700">;<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN149096" ></A ><H2 >参见</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.gethostbyname.html" ><B CLASS="function" >gethostbyname()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.gethostbynamel.html" ><B CLASS="function" >gethostbynamel()</B ></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.fsockopen.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.gethostbyname.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >fsockopen</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.network.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >gethostbyname</TD ></TR ></TABLE ></DIV ></BODY ></HTML >