Source of: /manual/fr/function.define.php
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<div id="function.define" class="refentry">
<div class="refnamediv">
<h1 class="refname">define</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">define</span> — <span class="dc-title">Définit une constante</span></p>
</div>
<a name="function.define.description"></a><div class="refsect1 description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><b>define</b></span>
( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$name</tt></span>
, <span class="methodparam"><span class="type"><a href="language.pseudo-types.php#language.types.mixed" class="type mixed">mixed</a></span> <tt class="parameter">$value</tt></span>
[, <span class="methodparam"><span class="type">bool</span> <tt class="parameter">$case_insensitive</tt><span class="initializer">= false</span></span>
] )</div>
<p class="para rdfs-comment">
Définit une constante à l'exécution.
</p>
</div>
<a name="function.define.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>
<dt class="varlistentry">
<span class="term"><i><tt class="parameter">value</tt></i>
</span>
</dt><dd class="listitem">
<p class="para">
La valeur de la constante ; seuls les scalaires et les valeurs <b><tt class="constant">NULL</tt></b> sont
autorisées. Les valeurs scalaires sont les valeurs <a href="language.types.integer.php" class="link">entier</a>,
<a href="language.types.float.php" class="link">nombre décimal</a>, <a href="language.types.string.php" class="link">chaîne de caractères</a> ou <a href="language.types.boolean.php" class="link">booléen</a>.
Il est techniquement possible de définir des constantes de type
<a href="language.types.resource.php" class="link">ressource</a>, mais cela est fortement déconseillé, et
peut causer des comportements inattendus.
</p>
</dd>
<dt class="varlistentry">
<span class="term"><i><tt class="parameter">case_insensitive</tt></i>
</span>
</dt><dd class="listitem">
<p class="para">
S'il vaut <b><tt class="constant">TRUE</tt></b>, le nom de la constante sera insensible à la casse :
<i>CONSTANT</i> et <i>Constant</i>
représentent des valeurs identiques.
</p>
</dd>
</dl>
<p>
</p>
</div>
<a name="function.define.returnvalues"></a><div class="refsect1 returnvalues">
<h3 class="title">Valeurs de retour</h3>
<p class="para">
Cette fonction retourne <b><tt class="constant">TRUE</tt></b> en cas de
succès, <b><tt class="constant">FALSE</tt></b> en cas d'échec.
</p>
</div>
<a name="function.define.examples"></a><div class="refsect1 examples">
<h3 class="title">Exemples</h3>
<p class="para">
</p><div class="example">
<p><b>Exemple #1 Définition d'une constante</b></p>
<div class="example-contents programlisting">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />define</span><span style="color: #007700">(</span><span style="color: #DD0000">"CONSTANT"</span><span style="color: #007700">, </span><span style="color: #DD0000">"Bonjour le monde."</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">CONSTANT</span><span style="color: #007700">; </span><span style="color: #FF8000">// affiche "Bonjour le monde."<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">Constant</span><span style="color: #007700">; </span><span style="color: #FF8000">// affiche "Constant" et émet une alerte<br /><br /></span><span style="color: #0000BB">define</span><span style="color: #007700">(</span><span style="color: #DD0000">"GREETING"</span><span style="color: #007700">, </span><span style="color: #DD0000">"Salut toi."</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">GREETING</span><span style="color: #007700">; </span><span style="color: #FF8000">// affiche "Salut toi."<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">Greeting</span><span style="color: #007700">; </span><span style="color: #FF8000">// affiche "Salut toi."<br /><br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div><p>
</p>
</div>
<a name="function.define.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.defined.php" class="function" rel="rdfs-seeAlso">defined()</a> - Vérifie l'existence d'une constante</li>
<li class="member"><a href="function.constant.php" class="function" rel="rdfs-seeAlso">constant()</a> - Retourne la valeur 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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