<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >mysql_field_name</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_field_len" HREF="function.mysql-field-len.html"><LINK REL="NEXT" TITLE="mysql_field_seek" HREF="function.mysql-field-seek.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-field-len.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-field-seek.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.mysql-field-name" ></A >mysql_field_name</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN135709" ></A ><P > (PHP 3, PHP 4, PHP 5)</P >mysql_field_name -- 取得结果中指定字段的字段名 </DIV ><DIV CLASS="refsect1" ><A NAME="AEN135712" ></A ><H2 >说明</H2 >string <B CLASS="methodname" >mysql_field_name</B > ( resource result, int field_index )<BR ></BR ><P > <B CLASS="function" >mysql_field_name()</B > 返回指定字段索引的字段名。<CODE CLASS="parameter" >result</CODE > 必须是一个合法的结果标识符,<CODE CLASS="parameter" >field_index</CODE > 是该字段的数字偏移量。 </P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >注意: </B > <CODE CLASS="parameter" >field_index</CODE > 从 0 开始。 </P ><P > 例如,第三个字段的索引值其实是 2,第四个字段的索引值是 3,以此类推。 </P ></BLOCKQUOTE ></DIV ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >注意: </B >本函数返回的字段名是<SPAN CLASS="emphasis" ><I CLASS="emphasis" >区分大小写</I ></SPAN >的。</P ></BLOCKQUOTE ></DIV ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN135735" ></A ><P ><B >例 1. <B CLASS="function" >mysql_field_name()</B > 例子</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#FF8000">/* The users table consists of three fields:<br /> * user_id<br /> * username<br /> * password.<br /> */<br /></font><font color="#0000BB">$link </font><font color="#007700">= </font><font color="#0000BB">mysql_connect</font><font color="#007700">(</font><font color="#DD0000">'localhost'</font><font color="#007700">, </font><font color="#DD0000">"mysql_user"</font><font color="#007700">, </font><font color="#DD0000">"mysql_password"</font><font color="#007700">);<br /></font><font color="#0000BB">$dbname </font><font color="#007700">= </font><font color="#DD0000">"mydb"</font><font color="#007700">;<br /></font><font color="#0000BB">mysql_select_db</font><font color="#007700">(</font><font color="#0000BB">$dbname</font><font color="#007700">, </font><font color="#0000BB">$link</font><font color="#007700">)<br /> or die(</font><font color="#DD0000">"Could not set $dbname: " </font><font color="#007700">. </font><font color="#0000BB">mysql_error</font><font color="#007700">());<br /></font><font color="#0000BB">$res </font><font color="#007700">= </font><font color="#0000BB">mysql_query</font><font color="#007700">(</font><font color="#DD0000">"select * from users"</font><font color="#007700">, </font><font color="#0000BB">$link</font><font color="#007700">);<br /><br />echo </font><font color="#0000BB">mysql_field_name</font><font color="#007700">(</font><font color="#0000BB">$res</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">) . </font><font color="#DD0000">"\n"</font><font color="#007700">;<br />echo </font><font color="#0000BB">mysql_field_name</font><font color="#007700">(</font><font color="#0000BB">$res</font><font color="#007700">, </font><font color="#0000BB">2</font><font color="#007700">);<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ><P > 以上例子将产生如下输出: </P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><PRE CLASS="screen" >user_id password</PRE ></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ><P > 为向下兼容仍然可以使用 <B CLASS="function" >mysql_fieldname()</B >,但反对这样做。 </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-field-len.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 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