kod içeriği bu sorun tam olarak nerede bulamadım localhost da herşey düzgün çalışıyor ama hostgator a atınca çalışmıyor ve bu hataları veriyor

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/***/public_html/****/panel/index.php:1) in /home/***/public_html/*****/panel/index.php on line 5

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/**/public_html/****/panel/index.php:1) in /home/**/public_html/****/panel/index.php on line 5

Warning: Cannot modify header information - headers already sent by (output started at /home/puleri/public_html/***/panel/index.php:1) in /home/***/public_html/****/panel/index.php on line 67

<?php
//initialize the session
if (!isset($_SESSION)) {
  session_start();
}

// ** Logout the current user. **
$logoutAction = $_SERVER['PHP_SELF']."?doLogout=true";
if ((isset($_SERVER['QUERY_STRING'])) && ($_SERVER['QUERY_STRING'] != "")){
  $logoutAction .="&". htmlentities($_SERVER['QUERY_STRING']);
}

if ((isset($_GET['doLogout'])) &&($_GET['doLogout']=="true")){
  //to fully log out a visitor we need to clear the session varialbles
  $_SESSION['MM_Username'] = NULL;
  $_SESSION['MM_UserGroup'] = NULL;
  $_SESSION['PrevUrl'] = NULL;
  unset($_SESSION['MM_Username']);
  unset($_SESSION['MM_UserGroup']);
  unset($_SESSION['PrevUrl']);
	
  $logoutGoTo = "giris.php";
  if ($logoutGoTo) {
    header("Location: $logoutGoTo");
    exit;
  }
}
?>
<?php
if (!isset($_SESSION)) {
  session_start();
}
$MM_authorizedUsers = "";
$MM_donotCheckaccess = "true";

// *** Restrict Access To Page: Grant or deny access to this page
function isAuthorized($strUsers, $strGroups, $UserName, $UserGroup) { 
  // For security, start by assuming the visitor is NOT authorized. 
  $isValid = False; 

  // When a visitor has logged into this site, the Session variable MM_Username set equal to their username. 
  // Therefore, we know that a user is NOT logged in if that Session variable is blank. 
  if (!empty($UserName)) { 
    // Besides being logged in, you may restrict access to only certain users based on an ID established when they login. 
    // Parse the strings into arrays. 
    $arrUsers = Explode(",", $strUsers); 
    $arrGroups = Explode(",", $strGroups); 
    if (in_array($UserName, $arrUsers)) { 
      $isValid = true; 
    } 
    // Or, you may restrict access to only certain users based on their username. 
    if (in_array($UserGroup, $arrGroups)) { 
      $isValid = true; 
    } 
    if (($strUsers == "") && true) { 
      $isValid = true; 
    } 
  } 
  return $isValid; 
}

$MM_restrictGoTo = "giris.php";
if (!((isset($_SESSION['MM_Username'])) && (isAuthorized("",$MM_authorizedUsers, $_SESSION['MM_Username'], $_SESSION['MM_UserGroup'])))) {   
  $MM_qsChar = "?";
  $MM_referrer = $_SERVER['PHP_SELF'];
  if (strpos($MM_restrictGoTo, "?")) $MM_qsChar = "&";
  if (isset($_SERVER['QUERY_STRING']) && strlen($_SERVER['QUERY_STRING']) > 0) 
  $MM_referrer .= "?" . $_SERVER['QUERY_STRING'];
  $MM_restrictGoTo = $MM_restrictGoTo. $MM_qsChar . "accesscheck=" . urlencode($MM_referrer);
  header("Location: ". $MM_restrictGoTo); 
  exit;
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  <html xmlns="http://www.w3.org/1999/xhtml">
  <head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>Başlıksız Belge</title>
  <link href="still.css" rel="stylesheet" type="text/css" />
  </head>
    
  <body>
  <div id="admin_panel">
    <p>1. <a href="hocalarveuzmanlik.php">Hocalar ve Uzmanlık Alanları</a></p>
    <p>2. Yapılan Yüksek Lisans Tezleri ve Doktora Tezleri</p>
    <p>3. İkili Anlaşmalar</p>
    <p>4. Laboratuarlar ve İçindeki Cihazlar</p>
    <p>5. İdari Personel</p>
    <p>6. Lisans Bitirme Tezleri</p>
    <p>7. Duyurular ve Resmi yazışmalar</p>
    <p>8. Ders Programları</p>
    <p>9. Sınav Programları</p>
    <div id="cikis"> <a href="<?php echo $logoutAction ?>">ÇİKİŞ</a></div>
  </div>
  </body>
  </html>