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159 lines
7.3 KiB
HTML
159 lines
7.3 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Cache a new variable in the data store</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.apcu-add" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">apcu_add</h1>
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<p class="verinfo">(PECL apcu >= 4.0.0)</p><p class="refpurpose"><span class="refname">apcu_add</span> — <span class="dc-title">
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Cache a new variable in the data store
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.apcu-add-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>apcu_add</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$key</code></span>
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, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$var</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$ttl</code><span class="initializer"> = 0</span></span>
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] ) : <span class="type">bool</span></div>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>apcu_add</strong></span>
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( <span class="methodparam"><span class="type">array</span> <code class="parameter">$values</code></span>
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[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$unused</code><span class="initializer"> = NULL</span></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$ttl</code><span class="initializer"> = 0</span></span>
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]] ) : <span class="type">array</span></div>
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<p class="para rdfs-comment">
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Caches a variable in the data store, only if it's not already stored.
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<span class="simpara">
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Unlike many other mechanisms in PHP, variables stored using
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<span class="function"><strong>apcu_add()</strong></span> will persist between requests (until the
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value is removed from the cache).
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</span>
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</p></blockquote>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.apcu-add-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">key</code></dt>
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<dd>
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<p class="para">
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Store the variable using this name. <code class="parameter">key</code>s are
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cache-unique, so attempting to use <span class="function"><strong>apcu_add()</strong></span> to
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store data with a key that already exists will not overwrite the
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existing data, and will instead return <strong><code>FALSE</code></strong>. (This is the only
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difference between <span class="function"><strong>apcu_add()</strong></span> and
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<span class="function"><a href="apcu_store.html" class="function">apcu_store()</a></span>.)
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</p>
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</dd>
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<dt>
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<code class="parameter">var</code></dt>
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<dd>
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<p class="para">
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The variable to store
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</p>
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</dd>
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<dt>
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<code class="parameter">ttl</code></dt>
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<dd>
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<p class="para">
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Time To Live; store <code class="parameter">var</code> in the cache for
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<code class="parameter">ttl</code> seconds. After the
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<code class="parameter">ttl</code> has passed, the stored variable will be
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expunged from the cache (on the next request). If no <code class="parameter">ttl</code>
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is supplied (or if the <code class="parameter">ttl</code> is
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<em>0</em>), the value will persist until it is removed from
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the cache manually, or otherwise fails to exist in the cache (clear,
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restart, etc.).
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</p>
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</dd>
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<dt>
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<code class="parameter">values</code></dt>
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<dd>
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<p class="para">
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Names in key, variables in value.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.apcu-add-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns TRUE if something has effectively been added into the cache, FALSE otherwise.
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Second syntax returns array with error keys.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.apcu-add-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-414">
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<p><strong>Example #1 A <span class="function"><strong>apcu_add()</strong></span> example</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$bar </span><span style="color: #007700">= </span><span style="color: #DD0000">'BAR'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">apcu_add</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">, </span><span style="color: #0000BB">$bar</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">apcu_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">$bar </span><span style="color: #007700">= </span><span style="color: #DD0000">'NEVER GETS SET'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">apcu_add</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">, </span><span style="color: #0000BB">$bar</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">apcu_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>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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string(3) "BAR"
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string(3) "BAR"
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.apcu-add-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="apcu_store.html" class="function" rel="rdfs-seeAlso">apcu_store()</a> - Cache a variable in the data store</span></li>
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<li class="member"><span class="function"><a href="apcu_fetch.html" class="function" rel="rdfs-seeAlso">apcu_fetch()</a> - Fetch a stored variable from the cache</span></li>
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<li class="member"><span class="function"><a href="apcu_delete.html" class="function" rel="rdfs-seeAlso">apcu_delete()</a> - Removes a stored variable from the cache</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |