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

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

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>apc_add</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN9165"
></A
><P
>    (no version information, might be only in CVS)</P
>apc_add&nbsp;--&nbsp;
   Cache a variable in the data store (only if it's not stored)
  </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN9168"
></A
><H2
>说明</H2
>bool <B
CLASS="methodname"
>apc_add</B
> ( string key, mixed var [, int ttl] )<BR
></BR
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
    Unlike many other mechanisms in PHP, variables stored using
    <B
CLASS="function"
>apc_add()</B
> will persist between requests (until the
    value is removed from the cache).
   </P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN9185"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>key</CODE
></DT
><DD
><P
>&#13;       Store the variable using this name. <CODE
CLASS="parameter"
>key</CODE
>s are
       cache-unique, so attempting to use <B
CLASS="function"
>apc_add()</B
> to
       store data with a key that already exists will not overwrite the
       existing data, and will instead return <TT
CLASS="constant"
><B
>FALSE</B
></TT
>. (This is the only
       difference between <B
CLASS="function"
>apc_add()</B
> and
       <A
HREF="function.apc-store.html"
><B
CLASS="function"
>apc_store()</B
></A
>.)
      </P
></DD
><DT
><CODE
CLASS="parameter"
>var</CODE
></DT
><DD
><P
>&#13;       The variable to store
      </P
></DD
><DT
><CODE
CLASS="parameter"
>ttl</CODE
></DT
><DD
><P
>&#13;       Time To Live; store <CODE
CLASS="parameter"
>var</CODE
> in the cache for
       <CODE
CLASS="parameter"
>ttl</CODE
> seconds. After the
       <CODE
CLASS="parameter"
>ttl</CODE
> has passed, the stored variable will be
       expunged from the cache (on the next request). If no <CODE
CLASS="parameter"
>ttl</CODE
>
       is supplied (or if the <CODE
CLASS="parameter"
>ttl</CODE
> is
       <TT
CLASS="literal"
>0</TT
>), the value will persist until it is removed from
       the cache manually, or otherwise fails to exist in the cache (clear,
       restart, etc.).
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN9215"
></A
><H2
>返回值</H2
><P
>&#13;   如果成功则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>，失败则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN9220"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
WIDTH="100%"
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN9223"
></A
><P
><B
>例 1. A <B
CLASS="function"
>apc_add()</B
> example</B
></P
><TABLE
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><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$bar </font><font color="#007700">= </font><font color="#DD0000">'BAR'</font><font color="#007700">;<br /></font><font color="#0000BB">apc_add</font><font color="#007700">(</font><font color="#DD0000">'foo'</font><font color="#007700">, </font><font color="#0000BB">$bar</font><font color="#007700">);<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">apc_fetch</font><font color="#007700">(</font><font color="#DD0000">'foo'</font><font color="#007700">));<br />echo </font><font color="#DD0000">"\n"</font><font color="#007700">;<br /></font><font color="#0000BB">$bar </font><font color="#007700">= </font><font color="#DD0000">'NEVER GETS SET'</font><font color="#007700">;<br /></font><font color="#0000BB">apc_add</font><font color="#007700">(</font><font color="#DD0000">'foo'</font><font color="#007700">, </font><font color="#0000BB">$bar</font><font color="#007700">);<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">apc_fetch</font><font color="#007700">(</font><font color="#DD0000">'foo'</font><font color="#007700">));<br />echo </font><font color="#DD0000">"\n"</font><font color="#007700">;<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>上例将输出：</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>string(3) "BAR"
string(3) "BAR"</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN9229"
></A
><H2
>参见</H2
><P
>&#13;   <P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
><A
HREF="function.apc-store.html"
><B
CLASS="function"
>apc_store()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.apc-fetch.html"
><B
CLASS="function"
>apc_fetch()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.apc-delete.html"
><B
CLASS="function"
>apc_delete()</B
></A
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>
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