Source of: /manual/fr/function.constant.php
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<div id="function.constant" class="refentry">
<div class="refnamediv">
<h1 class="refname">constant</h1>
<p class="verinfo">(PHP 4 >= 4.0.4, PHP 5)</p><p class="refpurpose"><span class="refname">constant</span> — <span class="dc-title">Retourne la valeur d'une constante</span></p>
</div>
<a name="function.constant.description"></a><div class="refsect1 description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type"><a href="language.pseudo-types.php#language.types.mixed" class="type mixed">mixed</a></span> <span class="methodname"><b>constant</b></span>
( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$name</tt></span>
)</div>
<p class="simpara">
Retourne la valeur de la constante <i><tt class="parameter">name</tt></i>
.
</p>
<p class="simpara">
<b>constant()</b> est pratique lorsque vous devez lire la
valeur d'une constante, mais que vous ne connaissez son nom que durant
l'exécution du script. Par exemple, ce nom peut être le résultat
d'une fonction.
</p>
<p class="simpara">
Cette fonction fonctionne également avec les
<a href="language.oop5.constants.php" class="link">constantes de classe</a>.
</p>
</div>
<a name="function.constant.parameters"></a><div class="refsect1 parameters">
<h3 class="title">Liste de paramètres</h3>
<p class="para">
</p><dl>
<dt class="varlistentry">
<span class="term"><i><tt class="parameter">name</tt></i>
</span>
</dt><dd class="listitem">
<p class="para">
Le nom de la constante.
</p>
</dd>
</dl>
<p>
</p>
</div>
<a name="function.constant.returnvalues"></a><div class="refsect1 returnvalues">
<h3 class="title">Valeurs de retour</h3>
<p class="para">
Retourne la valeur de la constante, ou <b><tt class="constant">NULL</tt></b> si la constante n'est pas définie.
</p>
</div>
<a name="function.constant.examples"></a><div class="refsect1 examples">
<h3 class="title">Exemples</h3>
<p class="para">
</p><div class="example">
<p><b>Exemple #1 Exemple avec <b>constant()</b></b></p>
<div class="example-contents programlisting">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br />define</span><span style="color: #007700">(</span><span style="color: #DD0000">"MAXSIZE"</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #0000BB">MAXSIZE</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">constant</span><span style="color: #007700">(</span><span style="color: #DD0000">"MAXSIZE"</span><span style="color: #007700">); </span><span style="color: #FF8000">// identique à la ligne précédente<br /><br /><br /></span><span style="color: #007700">interface </span><span style="color: #0000BB">bar </span><span style="color: #007700">{<br /> const </span><span style="color: #0000BB">test </span><span style="color: #007700">= </span><span style="color: #DD0000">'foobar!'</span><span style="color: #007700">;<br />}<br /><br />class </span><span style="color: #0000BB">foo </span><span style="color: #007700">{<br /> const </span><span style="color: #0000BB">test </span><span style="color: #007700">= </span><span style="color: #DD0000">'foobar!'</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$const </span><span style="color: #007700">= </span><span style="color: #DD0000">'test'</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">constant</span><span style="color: #007700">(</span><span style="color: #DD0000">'bar::'</span><span style="color: #007700">. </span><span style="color: #0000BB">$const</span><span style="color: #007700">)); </span><span style="color: #FF8000">// string(7) "foobar!"<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">constant</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo::'</span><span style="color: #007700">. </span><span style="color: #0000BB">$const</span><span style="color: #007700">)); </span><span style="color: #FF8000">// string(7) "foobar!"<br /><br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div><p>
</p>
</div>
<a name="function.constant.seealso"></a><div class="refsect1 seealso">
<h3 class="title">Voir aussi</h3>
<p class="para">
</p><ul class="simplelist">
<li class="member"><a href="function.define.php" class="function" rel="rdfs-seeAlso">define()</a> - Définit une constante</li>
<li class="member"><a href="function.defined.php" class="function" rel="rdfs-seeAlso">defined()</a> - Vérifie l'existence d'une constante</li>
<li class="member">La section sur les <a href="language.constants.php" class="link">constantes</a></li>
</ul><p>
</p>
</div>
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