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<title>Defines a set of constants for retrieval and mass-definition</title>
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<div class="refnamediv">
<h1 class="refname">apc_define_constants</h1>
<p class="verinfo">(PECL apc >= 3.0.0)</p><p class="refpurpose"><span class="refname">apc_define_constants</span> — <span class="dc-title">
Defines a set of constants for retrieval and mass-definition
</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.apc-define-constants-description">
<h3 class="title">Beschreibung</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><strong>apc_define_constants</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$key</code></span>
, <span class="methodparam"><span class="type">array</span> <code class="parameter">$constants</code></span>
[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$case_sensitive</code><span class="initializer"> = true</span></span>
] )</div>
<p class="para rdfs-comment">
<span class="function"><a href="function.define.html" class="function">define()</a></span> is notoriously slow. Since the main benefit of
APC is to increase the performance of scripts/applications, this mechanism
is provided to streamline the process of mass constant definition. However,
this function does not perform as well as anticipated.
</p>
<p class="para">
For a better-performing solution, try the
<a href="http://pecl.php.net/package/hidef" class="link external">» hidef</a> extension from PECL.
</p>
<blockquote class="note"><p><strong class="note">Hinweis</strong>:
<span class="simpara">
To remove a set of stored constants (without clearing the entire cache), an
empty array may be passed as the <code class="parameter">constants</code>
parameter, effectively clearing the stored value(s).
</span>
</p></blockquote>
</div>
<div class="refsect1 parameters" id="refsect1-function.apc-define-constants-parameters">
<h3 class="title">Parameter-Liste</h3>
<p class="para">
<dl>
<dt>
<code class="parameter">key</code></dt>
<dd>
<p class="para">
The <code class="parameter">key</code> serves as the name of the constant set
being stored. This <code class="parameter">key</code> is used to retrieve the
stored constants in <span class="function"><a href="function.apc-load-constants.html" class="function">apc_load_constants()</a></span>.
</p>
</dd>
<dt>
<code class="parameter">constants</code></dt>
<dd>
<p class="para">
An associative array of <em>constant_name => value</em>
pairs. The <em>constant_name</em> must follow the normal
<a href="language.constants.html" class="link">constant</a> naming rules.
<em>value</em> must evaluate to a scalar value.
</p>
</dd>
<dt>
<code class="parameter">case_sensitive</code></dt>
<dd>
<p class="para">
The default behaviour for constants is to be declared case-sensitive;
i.e. <em>CONSTANT</em> and <em>Constant</em>
represent different values. If this parameter evaluates to <strong><code>FALSE</code></strong> the
constants will be declared as case-insensitive symbols.
</p>
</dd>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.apc-define-constants-returnvalues">
<h3 class="title">Rückgabewerte</h3>
<p class="para">
Gibt bei Erfolg <strong><code>TRUE</code></strong> zurück. Im Fehlerfall wird <strong><code>FALSE</code></strong> zurückgegeben.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.apc-define-constants-examples">
<h3 class="title">Beispiele</h3>
<p class="para">
<div class="example" id="example-366">
<p><strong>Beispiel #1 <span class="function"><strong>apc_define_constants()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$constants </span><span style="color: #007700">= array(<br /> </span><span style="color: #DD0000">'ONE' </span><span style="color: #007700">=> </span><span style="color: #0000BB">1</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'TWO' </span><span style="color: #007700">=> </span><span style="color: #0000BB">2</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'THREE' </span><span style="color: #007700">=> </span><span style="color: #0000BB">3</span><span style="color: #007700">,<br />);<br /></span><span style="color: #0000BB">apc_define_constants</span><span style="color: #007700">(</span><span style="color: #DD0000">'numbers'</span><span style="color: #007700">, </span><span style="color: #0000BB">$constants</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">ONE</span><span style="color: #007700">, </span><span style="color: #0000BB">TWO</span><span style="color: #007700">, </span><span style="color: #0000BB">THREE</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>Das oben gezeigte Beispiel erzeugt folgende
Ausgabe:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
123
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.apc-define-constants-seealso">
<h3 class="title">Siehe auch</h3>
<p class="para">
<ul class="simplelist">
<li class="member"><span class="function"><a href="function.apc-load-constants.html" class="function" rel="rdfs-seeAlso">apc_load_constants()</a> - Loads a set of constants from the cache</span></li>
<li class="member"><span class="function"><a href="function.define.html" class="function" rel="rdfs-seeAlso">define()</a> - Definiert eine benannte Konstante</span></li>
<li class="member"><span class="function"><a href="function.constant.html" class="function" rel="rdfs-seeAlso">constant()</a> - Liefert den Wert einer Konstante</span></li>
<li class="member">
Or <a href="language.constants.html" class="link">the PHP constants reference</a>
</li>
</ul>
</p>
</div>
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