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

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

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>bcsub</H1
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><P
>    (PHP 3, PHP 4, PHP 5)</P
>bcsub&nbsp;--&nbsp;Subtract one arbitrary precision number from another</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN14482"
></A
><H2
>说明</H2
>string <B
CLASS="methodname"
>bcsub</B
> ( string left_operand, string right_operand [, int scale] )<BR
></BR
><P
>&#13;   Subtracts the <CODE
CLASS="parameter"
>right_operand</CODE
> from the
   <CODE
CLASS="parameter"
>left_operand</CODE
>.
  </P
></DIV
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></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>left_operand</CODE
></DT
><DD
><P
>&#13;       The left operand, as a string.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>right_operand</CODE
></DT
><DD
><P
>&#13;       The right operand, as a string.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>&#13;scale</CODE
></DT
><DD
><P
>This optional parameter is used to set the number
of digits after the decimal place in the result. You can also set the global default scale
for all functions by using <A
HREF="function.bcscale.html"
><B
CLASS="function"
>bcscale()</B
></A
>.</P
></DD
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>
  </P
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><H2
>返回值</H2
><P
>&#13;   The result of the substraction, as a string.
  </P
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>范例</H2
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><B
>例 1. <B
CLASS="function"
>bcsub()</B
> example</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br />$a </font><font color="#007700">= </font><font color="#DD0000">'1.234'</font><font color="#007700">;<br /></font><font color="#0000BB">$b </font><font color="#007700">= </font><font color="#DD0000">'5'</font><font color="#007700">;<br /><br />echo </font><font color="#0000BB">bcsub</font><font color="#007700">(</font><font color="#0000BB">$a</font><font color="#007700">, </font><font color="#0000BB">$b</font><font color="#007700">);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">// -3<br /></font><font color="#007700">echo </font><font color="#0000BB">bcsub</font><font color="#007700">(</font><font color="#0000BB">$a</font><font color="#007700">, </font><font color="#0000BB">$b</font><font color="#007700">, </font><font color="#0000BB">4</font><font color="#007700">);&nbsp;&nbsp;</font><font color="#FF8000">// -3.7660<br /><br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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><DIV
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><A
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></A
><H2
>参见</H2
><P
>&#13;   <P
></P
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><A
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>bcadd()</B
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