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<title>Checks if APC key exists</title>
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<div class="refnamediv">
<h1 class="refname">apc_exists</h1>
<p class="verinfo">(PECL apc >= 3.1.4)</p><p class="refpurpose"><span class="refname">apc_exists</span> — <span class="dc-title">Checks if APC key exists</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.apc-exists-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <span class="methodname"><strong>apc_exists</strong></span>
( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$keys</code></span>
)</div>
<p class="para rdfs-comment">
Checks if one or more APC keys exist.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.apc-exists-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<span class="term"><em><code class="parameter">keys</code></em></span>
<dd>
<p class="para">
A <span class="type"><a href="language.types.string.html" class="type string">string</a></span>, or an <span class="type"><a href="language.types.array.html" class="type array">array</a></span> of strings, that
contain keys.
</p>
</dd>
</dt>
</dl>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.apc-exists-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns <strong><code>TRUE</code></strong> if the key exists, otherwise <strong><code>FALSE</code></strong> Or if an
<span class="type"><a href="language.types.array.html" class="type array">array</a></span> was passed to <em><code class="parameter">keys</code></em>, then
an array is returned that contains all existing keys, or an empty
array if none exist.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.apc-exists-examples">
<h3 class="title">Examples</h3>
<div class="example" id="example-412">
<p><strong>Example #1 <span class="function"><strong>apc_exists()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$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>
</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>
Foo exists: apple
Baz does not exist
array(2) {
["foo"]=>
bool(true)
["bar"]=>
bool(true)
}
</pre></div>
</div>
</div>
</div>
<div class="refsect1 seealso" id="refsect1-function.apc-exists-seealso">
<h3 class="title">See Also</h3>
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.apc-cache-info.html" class="function" rel="rdfs-seeAlso">apc_cache_info()</a> - Retrieves cached information from APC's data store</span></li>
<li class="member"> <span class="function"><a href="function.apc-fetch.html" class="function" rel="rdfs-seeAlso">apc_fetch()</a> - Fetch a stored variable from the cache</span></li>
</ul>
</div>
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