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><H1
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>Memcache::decrement</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN118134"
></A
><P
>    (no version information, might be only in CVS)</P
>Memcache::decrement&nbsp;--&nbsp;Decrement item's value</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN118137"
></A
><H2
>说明</H2
>int <B
CLASS="methodname"
>Memcache::decrement</B
> ( string key [, int value] )<BR
></BR
><P
>&#13;   <B
CLASS="function"
>Memcache::decrement()</B
> decrements value of the 
   item by <CODE
CLASS="parameter"
>value</CODE
>. Similarly to 
   <B
CLASS="function"
>Memcache::increment()</B
>, current value of the item is
   being converted to numerical and after that <CODE
CLASS="parameter"
>value</CODE
>
   is substracted. 
   <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
     New item's value will not be less than zero.
    </P
></BLOCKQUOTE
></DIV
>
   <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
     Do not use <B
CLASS="function"
>Memcache::decrement()</B
> with item, which was
     stored compressed, because consequent call to 
     <B
CLASS="function"
>Memcache::get()</B
> will fail.
    </P
></BLOCKQUOTE
></DIV
>
   <B
CLASS="function"
>Memcache::decrement()</B
> <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>does not</I
></SPAN
>
   create an item if it didn't exist.
   Also you can use <B
CLASS="function"
>memcache_decrement()</B
> function.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN118162"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>key</CODE
></DT
><DD
><P
>&#13;       Key of the item do decrement.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>value</CODE
></DT
><DD
><P
>&#13;       Decrement the item by <CODE
CLASS="parameter"
>value</CODE
>. Optional and defaults to 1.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN118177"
></A
><H2
>返回值</H2
><P
>&#13;   Returns item's new value on success or <TT
CLASS="constant"
><B
>FALSE</B
></TT
> on failure.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN118181"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN118184"
></A
><P
><B
>例 1. <B
CLASS="function"
>Memcache::decrement()</B
> example</B
></P
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><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br /></font><font color="#FF8000">/* procedural API */<br /></font><font color="#0000BB">$memcache_obj </font><font color="#007700">= </font><font color="#0000BB">memcache_connect</font><font color="#007700">(</font><font color="#DD0000">'memcache_host'</font><font color="#007700">, </font><font color="#0000BB">11211</font><font color="#007700">);<br /></font><font color="#FF8000">/* decrement item by 2 */<br /></font><font color="#0000BB">$new_value </font><font color="#007700">= </font><font color="#0000BB">memcache_decrement</font><font color="#007700">(</font><font color="#0000BB">$memcache_obj</font><font color="#007700">, </font><font color="#DD0000">'test_item'</font><font color="#007700">, </font><font color="#0000BB">2</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* OO API */<br /></font><font color="#0000BB">$memcache_obj </font><font color="#007700">= new </font><font color="#0000BB">Memcache</font><font color="#007700">;<br /></font><font color="#0000BB">$memcache_obj</font><font color="#007700">-&gt;</font><font color="#0000BB">connect</font><font color="#007700">(</font><font color="#DD0000">'memcache_host'</font><font color="#007700">, </font><font color="#0000BB">11211</font><font color="#007700">);<br /></font><font color="#FF8000">/* decrement item by 3 */<br /></font><font color="#0000BB">$new_value </font><font color="#007700">= </font><font color="#0000BB">$memcache_obj</font><font color="#007700">-&gt;</font><font color="#0000BB">decrement</font><font color="#007700">(</font><font color="#DD0000">'test_item'</font><font color="#007700">, </font><font color="#0000BB">3</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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></DIV
></TD
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>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN118188"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
><TABLE
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><TBODY
><TR
><TD
><B
CLASS="function"
>Memcache::increment()</B
></TD
></TR
><TR
><TD
><B
CLASS="function"
>Memcache::replace()</B
></TD
></TR
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></P
>
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