Sophie: php-manual-pt_BR-5.2.4-1mdv2008.1 noarch

php-manual-pt_BR-5.2.4-1mdv2008.1.noarch.rpm

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>array_reduce</H1
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NAME="AEN11387"
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><P
>    (PHP 4 &#62;= 4.0.5, PHP 5)</P
>array_reduce&nbsp;--&nbsp;Reduz um array para um único valor através de um processo iterativo utilizando uma função.</DIV
><DIV
CLASS="refsect1"
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NAME="AEN11390"
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><H2
>Descrição</H2
>mixed <B
CLASS="methodname"
>array_reduce</B
> ( array input, mixed callback [, int initial] )<BR
></BR
><P
>&#13;     <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
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><P
><B
>Exemplo 1. Exemplo de <B
CLASS="function"
>array_reduce()</B
></B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?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 />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$v </font><font color="#007700">+= </font><font color="#0000BB">$w</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;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">$w</font><font color="#007700">)<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$v </font><font color="#007700">*= </font><font color="#0000BB">$w</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;return </font><font color="#0000BB">$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">?&gt;</font>
</font>
</code></TD
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>
    </P
><P
>&#13;     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
>&#13;     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
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