<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >prev</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="Manual do PHP" HREF="index.html"><LINK REL="UP" TITLE="Arrays" HREF="ref.array.html"><LINK REL="PREVIOUS" TITLE="pos" HREF="function.pos.html"><LINK REL="NEXT" TITLE="range" HREF="function.range.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" >Manual do PHP</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.pos.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.range.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.prev" ></A >prev</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN12939" ></A ><P > (PHP 3, PHP 4, PHP 5)</P >prev -- Retrocede o ponteiro interno de um array</DIV ><DIV CLASS="refsect1" ><A NAME="AEN12942" ></A ><H2 >Descrição</H2 >mixed <B CLASS="methodname" >prev</B > ( array array )<BR ></BR ><P > Retorna o valor do array que está na posição anterior a posição apontada pelo ponteiro interno, ou <TT CLASS="constant" ><B >FALSE</B ></TT > se houver mais elementos. <DIV CLASS="warning" ><P ></P ><TABLE CLASS="warning" BORDER="1" WIDTH="100%" ><TR ><TD ALIGN="CENTER" ><B >Atenção</B ></TD ></TR ><TR ><TD ALIGN="LEFT" ><P > Se o array contiver elementos vazios então essa função retornará <TT CLASS="constant" ><B >FALSE</B ></TT > para esses elementos. Para percorrer corretamente arrays que podem conter elementos vazios veja a função <A HREF="function.each.html" ><B CLASS="function" >each()</B ></A >. </P ></TD ></TR ></TABLE ></DIV > </P ><P > <B CLASS="function" >prev()</B > funciona da mesma forma que <A HREF="function.next.html" ><B CLASS="function" >next()</B ></A >, com a única diferença sendo de que a primeira retrocede o ponteiro interno em uma posição ao invés de avançá-lo. </P ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN12960" ></A ><P ><B >Exemplo 1. Exemplo de uso <B CLASS="function" >prev()</B > e funções relacionadas</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php <br /> $transport </font><font color="#007700">= array(</font><font color="#DD0000">'foot'</font><font color="#007700">, </font><font color="#DD0000">'bike'</font><font color="#007700">, </font><font color="#DD0000">'car'</font><font color="#007700">, </font><font color="#DD0000">'plane'</font><font color="#007700">); <br /> </font><font color="#0000BB">$mode </font><font color="#007700">= </font><font color="#0000BB">current</font><font color="#007700">(</font><font color="#0000BB">$transport</font><font color="#007700">); </font><font color="#FF8000">// $mode = 'foot'; <br /> </font><font color="#0000BB">$mode </font><font color="#007700">= </font><font color="#0000BB">next</font><font color="#007700">(</font><font color="#0000BB">$transport</font><font color="#007700">); </font><font color="#FF8000">// $mode = 'bike'; <br /> </font><font color="#0000BB">$mode </font><font color="#007700">= </font><font color="#0000BB">next</font><font color="#007700">(</font><font color="#0000BB">$transport</font><font color="#007700">); </font><font color="#FF8000">// $mode = 'car'; <br /> </font><font color="#0000BB">$mode </font><font color="#007700">= </font><font color="#0000BB">prev</font><font color="#007700">(</font><font color="#0000BB">$transport</font><font color="#007700">); </font><font color="#FF8000">// $mode = 'bike'; <br /> </font><font color="#0000BB">$mode </font><font color="#007700">= </font><font color="#0000BB">end</font><font color="#007700">(</font><font color="#0000BB">$transport</font><font color="#007700">); </font><font color="#FF8000">// $mode = 'plane'; <br /> </font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ><P > Veja também <A HREF="function.current.html" ><B CLASS="function" >current()</B ></A >, <A HREF="function.end.html" ><B CLASS="function" >end()</B ></A >, <A HREF="function.next.html" ><B CLASS="function" >next()</B ></A > e <A HREF="function.reset.html" ><B CLASS="function" >reset()</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.pos.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Principal</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.range.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >pos</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.array.html" ACCESSKEY="U" >Acima</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >range</TD ></TR ></TABLE ></DIV ></BODY ></HTML >