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?>
<div id="function.log" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">log</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">log</span> &mdash; <span class="dc-title">Logarithme naturel (népérien)</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.log-description">
  <h3 class="title">Description</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>log</strong></span>(<span class="methodparam"><span class="type"><a href="language.types.float.php" class="type float">float</a></span> <code class="parameter">$num</code></span>, <span class="methodparam"><span class="type"><a href="language.types.float.php" class="type float">float</a></span> <code class="parameter">$base</code><span class="initializer"> = <strong><code><a href="math.constants.php#constant.m-e">M_E</a></code></strong></span></span>): <span class="type"><a href="language.types.float.php" class="type float">float</a></span></div>

  <p class="para rdfs-comment">
   Si le paramètre optionnel <code class="parameter">base</code> est
   spécifié, <span class="function"><strong>log()</strong></span> retourne alors le
   logarithme en base <code class="parameter">base</code>, sinon
   <span class="function"><strong>log()</strong></span> retourne le logarithme naturel
   (ou népérien) de <code class="parameter">num</code>.
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.log-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 pour laquelle on calcule le logarithme
      </p>
     </dd>
    
    
     <dt><code class="parameter">base</code></dt>
     <dd>
      <p class="para">
       La base logarithmique optionnelle à utiliser
       (par défaut, &#039;e&#039; et donc, le logarithme naturel).
      </p>
     </dd>
    
   </dl>
  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.log-returnvalues">
  <h3 class="title">Valeurs de retour</h3>
  <p class="para">
   Le logarithme de <code class="parameter">num</code> en base
   <code class="parameter">base</code>, si fourni, ou le logarithme
   naturel.
  </p>
 </div>

 
 <div class="refsect1 seealso" id="refsect1-function.log-seealso">
  <h3 class="title">Voir aussi</h3>
  <p class="para">
   <ul class="simplelist">
    <li><span class="function"><a href="function.log10.php" class="function" rel="rdfs-seeAlso">log10()</a> - Logarithme en base 10</span></li>
    <li><span class="function"><a href="function.exp.php" class="function" rel="rdfs-seeAlso">exp()</a> - Calcul l'exponentielle de e</span></li>
    <li><span class="function"><a href="function.pow.php" class="function" rel="rdfs-seeAlso">pow()</a> - Expression exponentielle</span></li>
    <li><span class="function"><a href="function.error-log.php" class="function" rel="rdfs-seeAlso">error_log()</a> - Envoi un message d'erreur vers le gestionnaire d'erreurs d&eacute;fini</span></li>
   </ul>
  </p>
 </div>

</div><?php manual_footer($setup); ?>