Sophie: php-manual-en-4.3.0-2mdk noarch

php-manual-en-4.3.0-2mdk.noarch.rpm

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>bcpowmod</H1
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><P
>    (PHP 5 CVS only)</P
>bcpowmod&nbsp;--&nbsp;
     Raise an arbitrary precision number to another, reduced by a specified modulus.
    </DIV
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><H2
>Description</H2
>string <B
CLASS="methodname"
>bcpowmod</B
> ( string x, string y, string modulus [, int scale])<BR
></BR
><P
>&#13;     Use the fast-exponentiation method to raise <TT
CLASS="parameter"
><I
>x</I
></TT
> 
     to the power <TT
CLASS="parameter"
><I
>y</I
></TT
> with respect to the modulus
     <TT
CLASS="parameter"
><I
>modulus</I
></TT
>.  The optional
     <TT
CLASS="parameter"
><I
>scale</I
></TT
> can be used to set the number of
     digits after the decimal place in the result. 
    </P
><P
>&#13;     The following two statements are functionally identical.  The 
     <B
CLASS="function"
>bcpowmod()</B
> version however, executes in 
     less time and can accept larger parameters.
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CLASS="php"
>&#60;?php
$a = bcpowmod($x,$y,$mod);

$b = bcmod(bcpow($x,$y),$mod);

/* $a and $b are equal to each other. */
?&#62;</PRE
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><P
>&#13;     <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
       Because this method uses the modulus operation, non-natural numbers
       may give unexpected results.  A natural number is any positive 
       non-zero integer.
      </P
></BLOCKQUOTE
></DIV
>
    </P
><P
>&#13;     See also <A
HREF="function.bcpow.html"
><B
CLASS="function"
>bcpow()</B
></A
>, and
     <A
HREF="function.bcmod.html"
><B
CLASS="function"
>bcmod()</B
></A
>.
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