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<div id="function.dechex" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">dechex</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">dechex</span> &mdash; <span class="dc-title">Convertit de décimal en hexadécimal</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.dechex-description">
  <h3 class="title">Description</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>dechex</strong></span>(<span class="methodparam"><span class="type"><a href="language.types.integer.php" class="type int">int</a></span> <code class="parameter">$num</code></span>): <span class="type"><a href="language.types.string.php" class="type string">string</a></span></div>

  <p class="para rdfs-comment">
   Retourne une chaîne contenant la représentation hexadécimale de l&#039;argument
   <code class="parameter">num</code> non-signé.
  </p>
  <p class="para">
   Le nombre le plus grand pouvant être converti est
   <strong><code><a href="reserved.constants.php#constant.php-int-max">PHP_INT_MAX</a></code></strong><code class="literal"> * 2 + 1</code> (ou
   <code class="literal">-1</code>) : sur les plateformes 32-bit, ce sera
   <code class="literal">4294967295</code> en décimal, qui fera que la fonction
   <span class="function"><strong>dechex()</strong></span> retournera <code class="literal">ffffffff</code>.
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.dechex-parameters">
  <h3 class="title">Liste de paramètres</h3>
  <p class="para">
   <dl>
    
     <dt><code class="parameter">num</code></dt>
     <dd>
      <p class="para">
       La valeur décimale à convertir.
      </p>
      <p class="para">
       Vu que le type <a href="language.types.integer.php" class="link">entier</a> de PHP est signé, mais que la fonction
       <span class="function"><strong>dechex()</strong></span> ne fonctionne qu&#039;avec des entiers
       non-signés, les entiers négatifs seront traités comme s&#039;ils
       étaient non-signés.
      </p>
     </dd>
    
   </dl>
  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.dechex-returnvalues">
  <h3 class="title">Valeurs de retour</h3>
  <p class="para">
   Une représentation hexadécimale de <code class="parameter">num</code>.
  </p>
 </div>

 <div class="refsect1 examples" id="refsect1-function.dechex-examples">
  <h3 class="title">Exemples</h3>
  <p class="para">
   <div class="example" id="example-1">
    <p><strong>Exemple #1 Exemple avec <span class="function"><strong>dechex()</strong></span></strong></p>
    <div class="example-contents">
<div class="annotation-interactive phpcode"><code><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">dechex</span><span style="color: #007700">(</span><span style="color: #0000BB">10</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">dechex</span><span style="color: #007700">(</span><span style="color: #0000BB">47</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span></span></code></div>
    </div>

    <div class="example-contents"><p>L&#039;exemple ci-dessus va afficher :</p></div>
    <div class="example-contents screen">
<div class="annotation-interactive examplescode"><pre class="examplescode">a
2f</pre>
</div>
    </div>
   </div>
  </p>
  <p class="para">
   <div class="example" id="example-2">
    <p><strong>Exemple #2 Exemple avec la fonction <span class="function"><strong>dechex()</strong></span>
     avec de gros entiers</strong></p>
    <div class="example-contents">
<div class="annotation-interactive phpcode"><code><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">// L'affichage ci-dessous suppose que nous sommes sur une plateforme 32-bit.<br />// Notez que l'affichage est identique pour toutes les valeurs.<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">dechex</span><span style="color: #007700">(-</span><span style="color: #0000BB">1</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">dechex</span><span style="color: #007700">(</span><span style="color: #0000BB">PHP_INT_MAX </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">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">dechex</span><span style="color: #007700">(</span><span style="color: #0000BB">pow</span><span style="color: #007700">(</span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">32</span><span style="color: #007700">) - </span><span style="color: #0000BB">1</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span></span></code></div>
    </div>

    <div class="example-contents"><p>L&#039;exemple ci-dessus va afficher :</p></div>
    <div class="example-contents screen">
<div class="annotation-interactive examplescode"><pre class="examplescode">ffffffff
ffffffff
ffffffff</pre>
</div>
    </div>
   </div>
  </p>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.dechex-seealso">
  <h3 class="title">Voir aussi</h3>
  <p class="para">
   <ul class="simplelist">
    <li><span class="function"><a href="function.hexdec.php" class="function" rel="rdfs-seeAlso">hexdec()</a> - Convertit de hexad&eacute;cimal en d&eacute;cimal</span></li>
    <li><span class="function"><a href="function.decbin.php" class="function" rel="rdfs-seeAlso">decbin()</a> - Convertit de d&eacute;cimal en binaire</span></li>
    <li><span class="function"><a href="function.decoct.php" class="function" rel="rdfs-seeAlso">decoct()</a> - Convertit de d&eacute;cimal en octal</span></li>
    <li><span class="function"><a href="function.base-convert.php" class="function" rel="rdfs-seeAlso">base_convert()</a> - Convertit un nombre entre des bases arbitraires</span></li>
   </ul>
  </p>
 </div>

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