ÇÖZÜLDÜ - - php_self hatası

 <?php require_once('includes/config.php') ?>
 <?php include('includes/header.php') ?>
 
 
         <h1 class="ana_baslik"> PHP Eğitim Yönetim Paneli</h1>
             <div class="sol_menu"> 
                     <ul>
                         <li>Ana Sayfa</li>
                         <?php $soru = mysql_query("SELECT * FROM sayfalar");
                         while ($isim= mysql_fetch_array($soru)) {
                             echo "<li><a href=\"$PHP_SELF?sayfa={$isim['id']}\">{$isim['isim']}</a></li>";
                         }
                          ?>
                     </ul>
 
              </div>
                  <div class="sag_menu"> 
                      <h1 class="slogan">YÖNETİCİ PANELİ</h1>
                         <small>Hoşgeldiniz.</small>
                 <ul>
                     <li><a data-test="test" rel="nofollow" style="word-wrap: break-word; text-decoration: underline;" target="_blank" onclick="return dhExternalLinkRedirect(this)" href="/ExternalLinkRedirect?module=pgdcode&messageId=123496644&url=#" data-href="#">Site Yönetimi</a></li>
                     <li><a data-test="test" rel="nofollow" style="word-wrap: break-word; text-decoration: underline;" target="_blank" onclick="return dhExternalLinkRedirect(this)" href="/ExternalLinkRedirect?module=pgdcode&messageId=123496644&url=#" data-href="#">Yeni Kullanıcı Ekle</a></li>
                     <li><a data-test="test" rel="nofollow" style="word-wrap: break-word; text-decoration: underline;" target="_blank" onclick="return dhExternalLinkRedirect(this)" href="/ExternalLinkRedirect?module=pgdcode&messageId=123496644&url=#" data-href="#">Çıkış</a></li>
                 </ul>
                  </div>
 
 
 
 <?php include('includes/footer.php') ?>