<HTML
><HEAD
><TITLE
>array_reduce</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
REL="HOME"
TITLE="Manual de PHP"
HREF="index.html"><LINK
REL="UP"
TITLE="Funciones de matrices"
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=ISO-8859-1"></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 de 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"
>Siguiente</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="AEN5367"
></A
><P
> (PHP 4 >= 4.0.5)</P
>array_reduce --
Iteratively reduce the array to a single value using a callback
function
</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN5370"
></A
><H2
>Description</H2
>mixed <B
CLASS="methodname"
>array_reduce</B
> ( array input, callback function [, int initial])<BR
></BR
><P
> <B
CLASS="function"
>array_reduce()</B
> applies iteratively the
<TT
CLASS="parameter"
><I
>function</I
></TT
> function to the elements of the
array <TT
CLASS="parameter"
><I
>input</I
></TT
>, so as to reduce the array to
a single value. If the optional <TT
CLASS="parameter"
><I
>initial</I
></TT
> is
available, it will be used at the beginning of the process, or as
a final result in case the array is empty.
</P
><P
> <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN5390"
></A
><P
><B
>Ejemplo 1. <B
CLASS="function"
>array_reduce()</B
> example</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="php"
>function rsum($v, $w) {
$v += $w;
return $v;
}
function rmul($v, $w) {
$v *= $w;
return $v;
}
$a = array(1, 2, 3, 4, 5);
$x = array();
$b = array_reduce($a, "rsum");
$c = array_reduce($a, "rmul", 10);
$d = array_reduce($x, "rsum", 1);</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
</P
><P
> This will result in <TT
CLASS="varname"
>$b</TT
> containing
<TT
CLASS="literal"
>15</TT
>, <TT
CLASS="varname"
>$c</TT
> containing
<TT
CLASS="literal"
>1200</TT
> (= 1*2*3*4*5*10), and
<TT
CLASS="varname"
>$d</TT
> containing <TT
CLASS="literal"
>1</TT
>.
</P
><P
> See also <A
HREF="function.array-filter.html"
><B
CLASS="function"
>array_filter()</B
></A
> and
<A
HREF="function.array-map.html"
><B
CLASS="function"
>array_map()</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"
>Inicio</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="function.array-reverse.html"
ACCESSKEY="N"
>Siguiente</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"
>Subir</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>array_reverse</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>
