mirror of
https://github.com/fofolee/uTools-Manuals.git
synced 2025-06-18 05:26:57 +08:00
152 lines
7.2 KiB
HTML
152 lines
7.2 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
<html>
|
||
<head>
|
||
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
|
||
<title>缓存一个变量到数据存储</title>
|
||
</head>
|
||
<body class="docs"><div id="layout">
|
||
<div id="layout-content"><div id="function.apc-add" class="refentry">
|
||
<div class="refnamediv">
|
||
<h1 class="refname">apc_add</h1>
|
||
<p class="verinfo">(PECL apc >= 3.0.13)</p><p class="refpurpose"><span class="refname">apc_add</span> — <span class="dc-title">
|
||
缓存一个变量到数据存储
|
||
</span></p>
|
||
|
||
</div>
|
||
<div class="refsect1 description" id="refsect1-function.apc-add-description">
|
||
<h3 class="title">说明</h3>
|
||
<div class="methodsynopsis dc-description">
|
||
<span class="methodname"><strong>apc_add</strong></span>
|
||
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$key</code></span>
|
||
, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$var</code></span>
|
||
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$ttl</code><span class="initializer"> = 0</span></span>
|
||
] ) : <span class="type">bool</span></div>
|
||
|
||
<div class="methodsynopsis dc-description">
|
||
<span class="methodname"><strong>apc_add</strong></span>
|
||
( <span class="methodparam"><span class="type">array</span> <code class="parameter">$values</code></span>
|
||
[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$unused</code><span class="initializer"> = NULL</span></span>
|
||
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$ttl</code><span class="initializer"> = 0</span></span>
|
||
]] ) : <span class="type">array</span></div>
|
||
|
||
<p class="para rdfs-comment">
|
||
仅仅在缓存变量不存在的情况下缓存变量到数据存储中
|
||
</p>
|
||
<blockquote class="note"><p><strong class="note">Note</strong>:
|
||
<span class="simpara">
|
||
与PHP中其他的机制不同，使用<span class="function"><strong>apc_add()</strong></span> 存储变量
|
||
在不同的请求之间一直持久存在（直到从缓存系统中移除）
|
||
</span>
|
||
</p></blockquote>
|
||
</div>
|
||
|
||
<div class="refsect1 parameters" id="refsect1-function.apc-add-parameters">
|
||
<h3 class="title">参数</h3>
|
||
<p class="para">
|
||
<dl>
|
||
|
||
|
||
<dt>
|
||
<code class="parameter">key</code></dt>
|
||
|
||
<dd>
|
||
|
||
<p class="para">
|
||
存储缓存变量使用的名称<code class="parameter">key</code>s 是唯一的，
|
||
所以试图使用 <span class="function"><strong>apc_add()</strong></span> 去添加一个名称已经存在的缓存，
|
||
将不会覆盖现有的缓存的值, 并且返回 <strong><code>FALSE</code></strong>. (这个是 <span class="function"><strong>apc_add()</strong></span> 和
|
||
<span class="function"><a href="apc_store.html" class="function">apc_store()</a></span>之间唯一的不同.)
|
||
</p>
|
||
</dd>
|
||
|
||
|
||
|
||
<dt>
|
||
<code class="parameter">var</code></dt>
|
||
|
||
<dd>
|
||
|
||
<p class="para">
|
||
存储的变量
|
||
</p>
|
||
</dd>
|
||
|
||
|
||
|
||
<dt>
|
||
<code class="parameter">ttl</code></dt>
|
||
|
||
<dd>
|
||
|
||
<p class="para">
|
||
生存时间;在缓存中存储<code class="parameter">var</code>共<code class="parameter">ttl</code>秒,
|
||
在<code class="parameter">ttl</code>秒过去后,存储的变量将会从缓存中擦除(在下一次请求时),
|
||
如果没有设置<code class="parameter">ttl</code>(或者<code class="parameter">ttl</code>是<em>0</em>),
|
||
变量将一直存活到被手动移除为止,除此之外不在缓存中的可能原因是，缓存系统使用clear，或者restart等
|
||
</p>
|
||
</dd>
|
||
|
||
|
||
|
||
<dt>
|
||
<code class="parameter">values</code></dt>
|
||
|
||
<dd>
|
||
|
||
<p class="para">
|
||
Names in key, variables in value.
|
||
</p>
|
||
</dd>
|
||
|
||
|
||
</dl>
|
||
|
||
</p>
|
||
</div>
|
||
|
||
<div class="refsect1 returnvalues" id="refsect1-function.apc-add-returnvalues">
|
||
<h3 class="title">返回值</h3>
|
||
<p class="para">
|
||
Returns TRUE if something has effectively been added into the cache, FALSE otherwise.
|
||
Second syntax returns array with error keys.
|
||
</p>
|
||
</div>
|
||
|
||
|
||
<div class="refsect1 examples" id="refsect1-function.apc-add-examples">
|
||
<h3 class="title">范例</h3>
|
||
<p class="para">
|
||
<div class="example" id="example-398">
|
||
<p><strong>Example #1 <span class="function"><strong>apc_add()</strong></span> 例子</strong></p>
|
||
<div class="example-contents">
|
||
<div class="phpcode"><pre><span style="color: #000000">
|
||
<span style="color: #0000BB"><?php<br />$bar </span><span style="color: #007700">= </span><span style="color: #DD0000">'BAR'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">apc_add</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">, </span><span style="color: #0000BB">$bar</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">apc_fetch</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">));<br />echo </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$bar </span><span style="color: #007700">= </span><span style="color: #DD0000">'NEVER GETS SET'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">apc_add</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">, </span><span style="color: #0000BB">$bar</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">apc_fetch</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">));<br />echo </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span>
|
||
</span>
|
||
</pre></div>
|
||
</div>
|
||
|
||
<div class="example-contents"><p>以上例程会输出：</p></div>
|
||
<div class="example-contents screen">
|
||
<div class="cdata"><pre>
|
||
string(3) "BAR"
|
||
string(3) "BAR"
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
</p>
|
||
</div>
|
||
|
||
|
||
<div class="refsect1 seealso" id="refsect1-function.apc-add-seealso">
|
||
<h3 class="title">参见</h3>
|
||
<p class="para">
|
||
<ul class="simplelist">
|
||
<li class="member"><span class="function"><a href="apc_store.html" class="function" rel="rdfs-seeAlso">apc_store()</a> - Cache a variable in the data store</span></li>
|
||
<li class="member"><span class="function"><a href="apc_fetch.html" class="function" rel="rdfs-seeAlso">apc_fetch()</a> - 从缓存中取出存储的变量</span></li>
|
||
<li class="member"><span class="function"><a href="apc_delete.html" class="function" rel="rdfs-seeAlso">apc_delete()</a> - 从用户缓存中删除某个变量</span></li>
|
||
</ul>
|
||
</p>
|
||
</div>
|
||
|
||
|
||
</div></div></div></body></html> |