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docs/php/apc_cas.html
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docs/php/apc_cas.html
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<!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>用新值更新旧值</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-cas" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">apc_cas</h1>
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<p class="verinfo">(PECL apc >= 3.1.1)</p><p class="refpurpose"><span class="refname">apc_cas</span> — <span class="dc-title">用新值更新旧值</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.apc-cas-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_cas</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$key</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$old</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$new</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>apc_cas()</strong></span> 如果key存在，并且key当前存储的整数等于
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<code class="parameter">old</code>，就使用
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<code class="parameter">new</code> 更新key当前存储的整数。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.apc-cas-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">key</code></dt>
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<dd>
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<p class="para">
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需要被更新的 key。
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</p>
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</dd>
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<dt>
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<code class="parameter">old</code></dt>
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<dd>
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<p class="para">
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key当前值。
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</p>
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</dd>
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<dt>
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<code class="parameter">new</code></dt>
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<dd>
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<p class="para">
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指定的更新值。
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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-cas-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.apc-cas-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-401">
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<p><strong>Example #1 <span class="function"><strong>apc_cas()</strong></span> 示例</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 />apc_store</span><span style="color: #007700">(</span><span style="color: #DD0000">'foobar'</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">'$foobar = 2'</span><span style="color: #007700">, </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'$foobar == 1 ? 2 : 1 = '</span><span style="color: #007700">, (</span><span style="color: #0000BB">apc_cas</span><span style="color: #007700">(</span><span style="color: #DD0000">'foobar'</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'ok' </span><span style="color: #007700">: </span><span style="color: #DD0000">'fail'</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'$foobar == 2 ? 1 : 2 = '</span><span style="color: #007700">, (</span><span style="color: #0000BB">apc_cas</span><span style="color: #007700">(</span><span style="color: #DD0000">'foobar'</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'ok' </span><span style="color: #007700">: </span><span style="color: #DD0000">'fail'</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br /><br />echo </span><span style="color: #DD0000">'$foobar = '</span><span style="color: #007700">, </span><span style="color: #0000BB">apc_fetch</span><span style="color: #007700">(</span><span style="color: #DD0000">'foobar'</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br /><br />echo </span><span style="color: #DD0000">'$f__bar == 1 ? 2 : 1 = '</span><span style="color: #007700">, (</span><span style="color: #0000BB">apc_cas</span><span style="color: #007700">(</span><span style="color: #DD0000">'f__bar'</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'ok' </span><span style="color: #007700">: </span><span style="color: #DD0000">'fail'</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">apc_store</span><span style="color: #007700">(</span><span style="color: #DD0000">'perfection'</span><span style="color: #007700">, </span><span style="color: #DD0000">'xyz'</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">'$perfection == 2 ? 1 : 2 = '</span><span style="color: #007700">, (</span><span style="color: #0000BB">apc_cas</span><span style="color: #007700">(</span><span style="color: #DD0000">'perfection'</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'ok' </span><span style="color: #007700">: </span><span style="color: #DD0000">'epic fail'</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br /><br />echo </span><span style="color: #DD0000">'$foobar = '</span><span style="color: #007700">, </span><span style="color: #0000BB">apc_fetch</span><span style="color: #007700">(</span><span style="color: #DD0000">'foobar'</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</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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$foobar = 2
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$foobar == 1 ? 2 : 1 = fail
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$foobar == 2 ? 1 : 2 = ok
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$foobar = 1
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$f__bar == 1 ? 2 : 1 = fail
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$perfection == 2 ? 1 : 2 = epic fail
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$foobar = 1
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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-cas-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_dec.html" class="function" rel="rdfs-seeAlso">apc_dec()</a> - Decrease a stored number</span></li>
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<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>
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</ul>
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</div>
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</div></div></div></body></html>
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