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?>
<div id="function.clearstatcache" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">clearstatcache</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">clearstatcache</span> &mdash; <span class="dc-title">Efface le cache de <span class="function"><a href="function.stat.php" class="function">stat()</a></span></span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.clearstatcache-description">
  <h3 class="title">Description</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>clearstatcache</strong></span>(<span class="methodparam"><span class="type"><a href="language.types.boolean.php" class="type bool">bool</a></span> <code class="parameter">$clear_realpath_cache</code><span class="initializer"> = <strong><code><a href="reserved.constants.php#constant.false">false</a></code></strong></span></span>, <span class="methodparam"><span class="type"><a href="language.types.string.php" class="type string">string</a></span> <code class="parameter">$filename</code><span class="initializer"> = &quot;&quot;</span></span>): <span class="type"><a href="language.types.void.php" class="type void">void</a></span></div>

  <p class="para rdfs-comment">
   L&#039;appel à la fonction <span class="function"><a href="function.stat.php" class="function">stat()</a></span> ou
   <span class="function"><a href="function.lstat.php" class="function">lstat()</a></span> est relativement coûteux en termes de
   temps d&#039;exécution. Pour cela, le résultat du dernier
   appel à l&#039;une des fonctions de statut, (voir la liste ci-dessous), est
   sauvegardé pour réutilisation ultérieure. Pour
   forcer la vérification du statut d&#039;un fichier, dans le cas où le
   fichier aurait pu être modifié ou aurait disparu, il faut
   utiliser la fonction <span class="function"><strong>clearstatcache()</strong></span>
   afin d&#039;effacer de la mémoire les résultats du dernier
   appel à la fonction.
  </p>
  <p class="para">
   Il est à noter que PHP ne met pas en cache les informations concernant
   un fichier inexistant. Si l&#039;on appelle <span class="function"><a href="function.file-exists.php" class="function">file_exists()</a></span>
   sur un fichier qui n&#039;existe pas, la fonction retourne <strong><code><a href="reserved.constants.php#constant.false">false</a></code></strong>
   jusqu&#039;à ce que l&#039;on crée le fichier. Si l&#039;on crée le fichier,
   la fonction retourne <strong><code><a href="reserved.constants.php#constant.true">true</a></code></strong> même si l&#039;on efface le fichier.
   Cependant, <span class="function"><a href="function.unlink.php" class="function">unlink()</a></span> efface automatiquement le cache.
  </p>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    Cette fonction met en cache des informations sur les fichiers.
    Il n&#039;est donc nécessaire d&#039;appeler <span class="function"><strong>clearstatcache()</strong></span> que
    si l&#039;on fait des opérations multiples sur le même fichier, et que l&#039;on
    souhaite avoir une version récente des informations.
   </p>
  </p></blockquote>
  <p class="para">
   Les fonctions affectées incluent :
   <span class="function"><a href="function.stat.php" class="function">stat()</a></span>,
   <span class="function"><a href="function.lstat.php" class="function">lstat()</a></span>,
   <span class="function"><a href="function.file-exists.php" class="function">file_exists()</a></span>,
   <span class="function"><a href="function.is-writable.php" class="function">is_writable()</a></span>,
   <span class="function"><a href="function.is-readable.php" class="function">is_readable()</a></span>,
   <span class="function"><a href="function.is-executable.php" class="function">is_executable()</a></span>,
   <span class="function"><a href="function.is-file.php" class="function">is_file()</a></span>,
   <span class="function"><a href="function.is-dir.php" class="function">is_dir()</a></span>,
   <span class="function"><a href="function.is-link.php" class="function">is_link()</a></span>,
   <span class="function"><a href="function.filectime.php" class="function">filectime()</a></span>,
   <span class="function"><a href="function.fileatime.php" class="function">fileatime()</a></span>,
   <span class="function"><a href="function.filemtime.php" class="function">filemtime()</a></span>,
   <span class="function"><a href="function.fileinode.php" class="function">fileinode()</a></span>,
   <span class="function"><a href="function.filegroup.php" class="function">filegroup()</a></span>,
   <span class="function"><a href="function.fileowner.php" class="function">fileowner()</a></span>,
   <span class="function"><a href="function.filesize.php" class="function">filesize()</a></span>,
   <span class="function"><a href="function.filetype.php" class="function">filetype()</a></span>, et
   <span class="function"><a href="function.fileperms.php" class="function">fileperms()</a></span>.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.clearstatcache-parameters">
  <h3 class="title">Liste de paramètres</h3>
  <p class="para">
   <dl>
    
     <dt><code class="parameter">clear_realpath_cache</code></dt>
     <dd>
      <p class="para">
       Si l&#039;on doit <em>aussi</em> vider le cache des chemins réels.
      </p>
     </dd>
    
    
     <dt><code class="parameter">filename</code></dt>
     <dd>
      <p class="para">
       Nettoie le cache de chemin réel d&#039;un fichier spécifique.
       Ne peut être utilisé que si le paramètre
       <code class="parameter">clear_realpath_cache</code> vaut <strong><code><a href="reserved.constants.php#constant.true">true</a></code></strong>.
      </p>
     </dd>
    
   </dl>
  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.clearstatcache-returnvalues">
  <h3 class="title">Valeurs de retour</h3>
  <p class="para">
   Aucune valeur n&#039;est retournée.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.clearstatcache-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>clearstatcache()</strong></span></strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br />$file </span><span style="color: #007700">= </span><span style="color: #DD0000">'output_log.txt'</span><span style="color: #007700">;<br /><br />function </span><span style="color: #0000BB">get_owner</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">)<br />{<br />    </span><span style="color: #0000BB">$stat </span><span style="color: #007700">= </span><span style="color: #0000BB">stat</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">);<br />    </span><span style="color: #0000BB">$user </span><span style="color: #007700">= </span><span style="color: #0000BB">posix_getpwuid</span><span style="color: #007700">(</span><span style="color: #0000BB">$stat</span><span style="color: #007700">[</span><span style="color: #DD0000">'uid'</span><span style="color: #007700">]);<br />    return </span><span style="color: #0000BB">$user</span><span style="color: #007700">[</span><span style="color: #DD0000">'name'</span><span style="color: #007700">];<br />}<br /><br /></span><span style="color: #0000BB">$format </span><span style="color: #007700">= </span><span style="color: #DD0000">"UID @ %s: %s\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #0000BB">$format</span><span style="color: #007700">, </span><span style="color: #0000BB">date</span><span style="color: #007700">(</span><span style="color: #DD0000">'r'</span><span style="color: #007700">), </span><span style="color: #0000BB">get_owner</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">chown</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">, </span><span style="color: #DD0000">'ross'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #0000BB">$format</span><span style="color: #007700">, </span><span style="color: #0000BB">date</span><span style="color: #007700">(</span><span style="color: #DD0000">'r'</span><span style="color: #007700">), </span><span style="color: #0000BB">get_owner</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">clearstatcache</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #0000BB">$format</span><span style="color: #007700">, </span><span style="color: #0000BB">date</span><span style="color: #007700">(</span><span style="color: #DD0000">'r'</span><span style="color: #007700">), </span><span style="color: #0000BB">get_owner</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">?&gt;</span></span></code></div>
    </div>

    <div class="example-contents"><p>Résultat de l&#039;exemple ci-dessus est similaire à :</p></div>
    <div class="example-contents screen">
<div class="examplescode"><pre class="examplescode">UID @ Sun, 12 Oct 2008 20:48:28 +0100: root
UID @ Sun, 12 Oct 2008 20:48:28 +0100: root
UID @ Sun, 12 Oct 2008 20:48:28 +0100: ross</pre>
</div>
    </div>
   </div>
  </p>
 </div>


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