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>gmp_clrbit</H1
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><P
> (PHP 4 >= 4.0.4, PHP 5)</P
>gmp_clrbit -- Clear bit</DIV
><DIV
CLASS="refsect1"
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></A
><H2
>Description</H2
>void <B
CLASS="methodname"
>gmp_clrbit</B
> ( resource &a, int index )<BR
></BR
><P
> Clears (sets to 0) bit <CODE
CLASS="parameter"
>index</CODE
> in
<CODE
CLASS="parameter"
>a</CODE
>. The index starts at 0.
</P
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><B
>注意: </B
>
Unlike most of the other GMP functions, <B
CLASS="function"
>gmp_clrbit()</B
>
must be called with a GMP resource that already exists (using
<A
HREF="function.gmp-init.html"
><B
CLASS="function"
>gmp_init()</B
></A
> for example). One will not be
automatically created.
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><B
>例 1. <B
CLASS="function"
>gmp_clrbit()</B
> example</B
></P
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><code><font color="#000000">
<font color="#0000BB"><?php<br />$a </font><font color="#007700">= </font><font color="#0000BB">gmp_init</font><font color="#007700">(</font><font color="#DD0000">"0xff"</font><font color="#007700">);<br /></font><font color="#0000BB">gmp_clrbit</font><font color="#007700">(</font><font color="#0000BB">$a</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">); </font><font color="#FF8000">// index starts at 0, least significant bit<br /></font><font color="#007700">echo </font><font color="#0000BB">gmp_strval</font><font color="#007700">(</font><font color="#0000BB">$a</font><font color="#007700">) . </font><font color="#DD0000">"\n"</font><font color="#007700">;<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
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><P
> The printout of the above program will be:
</P
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>254</PRE
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><P
> See also <A
HREF="function.gmp-setbit.html"
><B
CLASS="function"
>gmp_setbit()</B
></A
>.
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