<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >dba_firstkey</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="Database (dbm-style) Abstraction Layer Functions" HREF="ref.dba.html"><LINK REL="PREVIOUS" TITLE="dba_fetch" HREF="function.dba-fetch.html"><LINK REL="NEXT" TITLE="dba_handlers" HREF="function.dba-handlers.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.dba-fetch.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.dba-handlers.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.dba-firstkey" ></A >dba_firstkey</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN33122" ></A ><P > (PHP 3 >= 3.0.8, PHP 4, PHP 5)</P >dba_firstkey -- Fetch first key</DIV ><DIV CLASS="refsect1" ><A NAME="AEN33125" ></A ><H2 >说明</H2 >string <B CLASS="methodname" >dba_firstkey</B > ( resource handle )<BR ></BR ><P > <B CLASS="function" >dba_firstkey()</B > returns the first key of the database and resets the internal key pointer. This permits a linear search through the whole database. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN33135" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >handle</CODE ></DT ><DD ><P > The database handler, returned by <A HREF="function.dba-open.html" ><B CLASS="function" >dba_open()</B ></A > or <A HREF="function.dba-popen.html" ><B CLASS="function" >dba_popen()</B ></A >. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN33146" ></A ><H2 >返回值</H2 ><P > Returns the key on success, or <TT CLASS="constant" ><B >FALSE</B ></TT > on failure. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN33150" ></A ><H2 >参见</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.dba-nextkey.html" ><B CLASS="function" >dba_nextkey()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.dba-key-split.html" ><B CLASS="function" >dba_key_split()</B ></A ></TD ></TR ><TR ><TD >Example 2 in the <A HREF="ref.dba.html#dba.examples" >DBA examples</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.dba-fetch.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.dba-handlers.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >dba_fetch</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.dba.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >dba_handlers</TD ></TR ></TABLE ></DIV ></BODY ></HTML >