<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >array_reduce</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="array_rand" HREF="function.array-rand.html"><LINK REL="NEXT" TITLE="array_reverse" HREF="function.array-reverse.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.array-rand.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.array-reverse.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.array-reduce" ></A >array_reduce</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN11387" ></A ><P > (PHP 4 >= 4.0.5, PHP 5)</P >array_reduce -- Reduz um array para um único valor através de um processo iterativo utilizando uma função.</DIV ><DIV CLASS="refsect1" ><A NAME="AEN11390" ></A ><H2 >Descrição</H2 >mixed <B CLASS="methodname" >array_reduce</B > ( array input, mixed callback [, int initial] )<BR ></BR ><P > <B CLASS="function" >array_reduce()</B > aplica iterativamente a função definida em <CODE CLASS="parameter" >callback</CODE > nos elementos de <CODE CLASS="parameter" >input</CODE >, de forma a reduzi-lo a um único valor. Se o argumento opcional <CODE CLASS="parameter" >initial</CODE > for passado, ele será utilizado no início do processo, ou como um resultado final se o array estiver vazio. Se a array estiver vazia e <CODE CLASS="parameter" >initial</CODE > não for passado, <B CLASS="function" >array_reduce()</B > retornará <TT CLASS="constant" ><B >NULL</B ></TT >. </P ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN11413" ></A ><P ><B >Exemplo 1. Exemplo de <B CLASS="function" >array_reduce()</B ></B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#007700">function </font><font color="#0000BB">soma</font><font color="#007700">(</font><font color="#0000BB">$v</font><font color="#007700">, </font><font color="#0000BB">$w</font><font color="#007700">)<br />{<br /> </font><font color="#0000BB">$v </font><font color="#007700">+= </font><font color="#0000BB">$w</font><font color="#007700">;<br /> return </font><font color="#0000BB">$v</font><font color="#007700">;<br />}<br /><br />function </font><font color="#0000BB">multiplicacao</font><font color="#007700">(</font><font color="#0000BB">$v</font><font color="#007700">, </font><font color="#0000BB">$w</font><font color="#007700">)<br />{<br /> </font><font color="#0000BB">$v </font><font color="#007700">*= </font><font color="#0000BB">$w</font><font color="#007700">;<br /> return </font><font color="#0000BB">$v</font><font color="#007700">;<br />}<br /><br /></font><font color="#0000BB">$a </font><font color="#007700">= array(</font><font color="#0000BB">1</font><font color="#007700">, </font><font color="#0000BB">2</font><font color="#007700">, </font><font color="#0000BB">3</font><font color="#007700">, </font><font color="#0000BB">4</font><font color="#007700">, </font><font color="#0000BB">5</font><font color="#007700">);<br /></font><font color="#0000BB">$x </font><font color="#007700">= array();<br /></font><font color="#0000BB">$b </font><font color="#007700">= </font><font color="#0000BB">array_reduce</font><font color="#007700">(</font><font color="#0000BB">$a</font><font color="#007700">, </font><font color="#DD0000">"soma"</font><font color="#007700">);<br /></font><font color="#0000BB">$c </font><font color="#007700">= </font><font color="#0000BB">array_reduce</font><font color="#007700">(</font><font color="#0000BB">$a</font><font color="#007700">, </font><font color="#DD0000">"multiplicacao"</font><font color="#007700">, </font><font color="#0000BB">10</font><font color="#007700">);<br /></font><font color="#0000BB">$d </font><font color="#007700">= </font><font color="#0000BB">array_reduce</font><font color="#007700">(</font><font color="#0000BB">$x</font><font color="#007700">, </font><font color="#DD0000">"soma"</font><font color="#007700">, </font><font color="#0000BB">1</font><font color="#007700">);<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ><P > Isso resultará em <CODE CLASS="varname" >$b</CODE > contendo <TT CLASS="literal" >15</TT >, <CODE CLASS="varname" >$c</CODE > contendo <TT CLASS="literal" >1200</TT > (= 10*1*2*3*4*5), e <CODE CLASS="varname" >$d</CODE > contendo <TT CLASS="literal" >1</TT >. </P ><P > Veja também <A HREF="function.array-filter.html" ><B CLASS="function" >array_filter()</B ></A >, <A HREF="function.array-map.html" ><B CLASS="function" >array_map()</B ></A >, <A HREF="function.array-unique.html" ><B CLASS="function" >array_unique()</B ></A > e <A HREF="function.array-count-values.html" ><B CLASS="function" >array_count_values()</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.array-rand.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.array-reverse.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >array_rand</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" >array_reverse</TD ></TR ></TABLE ></DIV ></BODY ></HTML >