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96 lines
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HTML
96 lines
6.4 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>检查APC中是否存在某个或者某些key</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.apc-exists" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">apc_exists</h1>
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<p class="verinfo">(PECL apc >= 3.1.4)</p><p class="refpurpose"><span class="refname">apc_exists</span> — <span class="dc-title">检查APC中是否存在某个或者某些key</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.apc-exists-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>apc_exists</strong></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">$keys</code></span>
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) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<p class="para rdfs-comment">
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检查是否有一个或者多个APC键名存在
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.apc-exists-parameters">
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<h3 class="title">参数</h3>
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<dl>
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<dt>
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<code class="parameter">keys</code></dt>
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<dd>
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<p class="para">
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<span class="type"><a href="language.types.string.html" class="type string">string</a></span>，或者包含键的 <span class="type"><a href="language.types.array.html" class="type array">array</a></span>，元素是字符串。
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</p>
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</dd>
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</dl>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.apc-exists-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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如果Key存在的话返回 <strong><code>TRUE</code></strong> , 否则返回 <strong><code>FALSE</code></strong> 如果参数
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<code class="parameter">keys</code>是一个<span class="type"><a href="language.types.array.html" class="type array">array</a></span> ，
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将返回一个包含所有存在的key的数组，假如数组中的key一个都不存在的话，
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就返回空的数组。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.apc-exists-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-406">
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<p><strong>Example #1 <span class="function"><strong>apc_exists()</strong></span> 例子</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 />$fruit </span><span style="color: #007700">= </span><span style="color: #DD0000">'apple'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$veggie </span><span style="color: #007700">= </span><span style="color: #DD0000">'carrot'</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">apc_store</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">, </span><span style="color: #0000BB">$fruit</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">apc_store</span><span style="color: #007700">(</span><span style="color: #DD0000">'bar'</span><span style="color: #007700">, </span><span style="color: #0000BB">$veggie</span><span style="color: #007700">);<br /><br />if (</span><span style="color: #0000BB">apc_exists</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"Foo exists: "</span><span style="color: #007700">;<br /> echo </span><span style="color: #0000BB">apc_fetch</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">);<br />} else {<br /> echo </span><span style="color: #DD0000">"Foo does not exist"</span><span style="color: #007700">;<br />}<br /><br />echo </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />if (</span><span style="color: #0000BB">apc_exists</span><span style="color: #007700">(</span><span style="color: #DD0000">'baz'</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"Baz exists."</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">"Baz does not exist"</span><span style="color: #007700">;<br />}<br /><br />echo </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$ret </span><span style="color: #007700">= </span><span style="color: #0000BB">apc_exists</span><span style="color: #007700">(array(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">, </span><span style="color: #DD0000">'donotexist'</span><span style="color: #007700">, </span><span style="color: #DD0000">'bar'</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$ret</span><span style="color: #007700">);<br /><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>以上例程的输出类似于：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Foo exists: apple
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Baz does not exist
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array(2) {
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["foo"]=>
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bool(true)
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["bar"]=>
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bool(true)
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}
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</pre></div>
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</div>
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</div>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.apc-exists-seealso">
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<h3 class="title">参见</h3>
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="apc_cache_info.html" class="function" rel="rdfs-seeAlso">apc_cache_info()</a> - Retrieves cached information from APC's data store</span></li>
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<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>
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</ul>
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</div>
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</div></div></div></body></html> |