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124 lines
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HTML
124 lines
6.6 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>Decrease a stored number</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-dec" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">apcu_dec</h1>
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<p class="verinfo">(PECL apcu >= 4.0.0)</p><p class="refpurpose"><span class="refname">apcu_dec</span> — <span class="dc-title">Decrease a stored number</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.apcu-dec-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_dec</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$key</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$step</code><span class="initializer"> = 1</span></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter reference">&$success</code></span>
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]] ) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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Decreases a stored integer value.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.apcu-dec-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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The key of the value being decreased.
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</p>
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</dd>
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<dt>
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<code class="parameter">step</code></dt>
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<dd>
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<p class="para">
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The step, or value to decrease.
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</p>
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</dd>
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<dt>
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<code class="parameter">success</code></dt>
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<dd>
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<p class="para">
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Optionally pass the success or fail boolean value to
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this referenced variable.
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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.apcu-dec-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns the current value of <code class="parameter">key</code>'s value on success,
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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.apcu-dec-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-417">
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<p><strong>Example #1 <span class="function"><strong>apcu_dec()</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 /></span><span style="color: #007700">echo </span><span style="color: #DD0000">"Let's do something with success"</span><span style="color: #007700">, </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">apcu_store</span><span style="color: #007700">(</span><span style="color: #DD0000">'anumber'</span><span style="color: #007700">, </span><span style="color: #0000BB">42</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #0000BB">apcu_fetch</span><span style="color: #007700">(</span><span style="color: #DD0000">'anumber'</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br /><br />echo </span><span style="color: #0000BB">apcu_dec</span><span style="color: #007700">(</span><span style="color: #DD0000">'anumber'</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">apcu_dec</span><span style="color: #007700">(</span><span style="color: #DD0000">'anumber'</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">apcu_dec</span><span style="color: #007700">(</span><span style="color: #DD0000">'anumber'</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">, </span><span style="color: #0000BB">$success</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$success</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #DD0000">"Now, let's fail"</span><span style="color: #007700">, </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">, </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">apcu_store</span><span style="color: #007700">(</span><span style="color: #DD0000">'astring'</span><span style="color: #007700">, </span><span style="color: #DD0000">'foo'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$ret </span><span style="color: #007700">= </span><span style="color: #0000BB">apcu_dec</span><span style="color: #007700">(</span><span style="color: #DD0000">'astring'</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">$fail</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$ret</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$fail</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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Let's do something with success
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42
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41
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31
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21
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bool(true)
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Now, let's fail
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bool(false)
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bool(false)
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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.apcu-dec-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="apcu_inc.html" class="function" rel="rdfs-seeAlso">apcu_inc()</a> - Increase a stored number</span></li>
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</ul>
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</div>
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</div></div></div></body></html> |