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<title>Updates an old value with a new value</title>
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</div><hr /><div id="function.apc-cas" class="refentry">
<div class="refnamediv">
<h1 class="refname">apc_cas</h1>
<p class="verinfo">(PECL apc >= 3.1.1)</p><p class="refpurpose"><span class="refname">apc_cas</span> — <span class="dc-title">Updates an old value with a new value</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.apc-cas-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><strong>apc_cas</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$key</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$old</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$new</code></span>
)</div>
<p class="para rdfs-comment">
<span class="function"><strong>apc_cas()</strong></span> updates an already existing integer value if the
<em><code class="parameter">old</code></em> parameter matches the currently stored value
with the value of the <em><code class="parameter">new</code></em> parameter.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.apc-cas-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<span class="term"><em><code class="parameter">key</code></em></span>
<dd>
<p class="para">
The key of the value being updated.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">old</code></em></span>
<dd>
<p class="para">
The old value (the value currently stored).
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">new</code></em></span>
<dd>
<p class="para">
The new value to update to.
</p>
</dd>
</dt>
</dl>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.apc-cas-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns <strong><code>TRUE</code></strong> on success or <strong><code>FALSE</code></strong> on failure.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.apc-cas-examples">
<h3 class="title">Examples</h3>
<div class="example" id="example-407">
<p><strong>Example #1 <span class="function"><strong>apc_cas()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />apc_store</span><span style="color: #007700">(</span><span style="color: #DD0000">'foobar'</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">'$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>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output
something similar to:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
$foobar = 2
$foobar == 1 ? 2 : 1 = fail
$foobar == 2 ? 1 : 2 = ok
$foobar = 1
$f__bar == 1 ? 2 : 1 = fail
$perfection == 2 ? 1 : 2 = epic fail
$foobar = 1
</pre></div>
</div>
</div>
</div>
<div class="refsect1 seealso" id="refsect1-function.apc-cas-seealso">
<h3 class="title">See Also</h3>
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.apc-dec.html" class="function" rel="rdfs-seeAlso">apc_dec()</a> - Decrease a stored number</span></li>
<li class="member"> <span class="function"><a href="function.apc-store.html" class="function" rel="rdfs-seeAlso">apc_store()</a> - Cache a variable in the data store</span></li>
</ul>
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