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<?php
  function estElleBissextile($annee)
  {
    $dth = strtotime("$annee-01-01");
    return date('L', $dth);
  }

  for($i = 1980; $i <= 2050; $i++)
  {
    $chaine = "$i ";
    if( !estElleBissextile($i) )
      $chaine .= "est ";
      else
       $chaine .= "n'est pas ";
    $chaine .= "une année bissextille.<br />";

    echo $chaine;
  }
?>