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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>pow</H1
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><P
>    (PHP 3, PHP 4, PHP 5)</P
>pow&nbsp;--&nbsp;Potência</DIV
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><H2
>Descrição</H2
>number <B
CLASS="methodname"
>pow</B
> ( number base, number exp )<BR
></BR
><P
>&#13;     Retorna a <CODE
CLASS="parameter"
>base</CODE
> elevada ao expoente
     <CODE
CLASS="parameter"
>exp</CODE
>. Se possível, esta função
     retornará um <A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>.
    </P
><P
>&#13;     Se a potência não puder ser calculada, um alerta será lançado,
     e <B
CLASS="function"
>pow()</B
> retornará <TT
CLASS="constant"
><B
>FALSE</B
></TT
>.
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><B
>Exemplo 1. Alguns exemplos de <B
CLASS="function"
>pow()</B
></B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br />var_dump</font><font color="#007700">( </font><font color="#0000BB">pow</font><font color="#007700">(</font><font color="#0000BB">2</font><font color="#007700">,</font><font color="#0000BB">8</font><font color="#007700">) ); </font><font color="#FF8000">// int(256)<br /></font><font color="#007700">echo </font><font color="#0000BB">pow</font><font color="#007700">(-</font><font color="#0000BB">1</font><font color="#007700">,</font><font color="#0000BB">20</font><font color="#007700">); </font><font color="#FF8000">// 1<br /></font><font color="#007700">echo </font><font color="#0000BB">pow</font><font color="#007700">(</font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">); </font><font color="#FF8000">// 1<br /><br /></font><font color="#007700">echo </font><font color="#0000BB">pow</font><font color="#007700">(-</font><font color="#0000BB">1</font><font color="#007700">, </font><font color="#0000BB">5.5</font><font color="#007700">); </font><font color="#FF8000">// erro<br /><br /></font><font color="#0000BB">?&gt;</font>
</font>
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>Atenção</B
></TD
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><P
>&#13;      No PHP 4.0.6 e posteriores, <B
CLASS="function"
>pow()</B
> sempre retornará
      um <A
HREF="language.types.float.html"
><B
CLASS="type"
>float</B
></A
>, e não gerará avisos de erros.
     </P
></TD
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></DIV
><P
>&#13;     Veja também <A
HREF="function.exp.html"
><B
CLASS="function"
>exp()</B
></A
> e <A
HREF="function.sqrt.html"
><B
CLASS="function"
>sqrt()</B
></A
>.
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