PHP無法修改標題

我試圖解決PHP的問題，但我無法找出我的錯誤在哪裏。如果有人能幫助我，請寫一個答案。PHP無法修改標題

PHP發送以下錯誤消息：

[26-Feb-2014 03:00:46 Europe/Berlin] PHP Warning: Cannot modify header information - headers already sent by (output started at /Applications/MAMP/htdocs/PressIn_21022014/includes/head.php:2) in /Applications/MAMP/htdocs/PressIn_21022014/recap_commande.php on line 41

當我點擊valider_commande：

<?php 
    session_start(); 
    if(isset($_SESSION['auth']) && $_SESSION['auth'] == true){ 
    $document = basename(__FILE__); 
    $titre = "Espace Membre"; 
    include("includes/head.php"); 
?> 


    <div class="background col-xs-12 col-sm-12 col-md-12 col-lg-12"> 
      <div class="container top"> 
      <div class="elements"> 
       <form id="form_top_ten" method="POST" action="recap_commande.php"> 
        <div class="row"> 
         <div class="col-xs-12 col-sm-6 col-md-6 col-lg-6"> 
           <div class="commande_top_ten"> 
            <div class="col-xs-3 col-sm-4 col-md-4 col-lg-3"><h4>Veste</h4></div> 
             <img src="img/icone_veste.svg" /> 
             <button id="moins_veste" type="button" class="btn-moins btn-circle btn-mini"><i class="glyphicon-minus"></i> </button> 
             <span class="quantite" id="top_ten_nb_veste">1</span> 
             <button id="plus_veste" type="button" class="btn-plus btn-circle btn-mini"><i class="glyphicon-plus"></i> </button> 
             <div class="prix"><span class="prix_pantalon"> 10</span> €</div> 
           </div> 
         </div> 
         <div class="col-xs-12 col-sm-6 col-md-6 col-lg-6"> 
           <div class="commande_top_ten"> 
            <div class="col-xs-3 col-sm-4 col-md-4 col-lg-3"><h4>Pantalon</h4></div> 
            <img src="img/icone_pant.svg" /> 
            <button id="moins_pantalon" type="button" class="btn-moins btn-circle btn-mini"><i class="glyphicon-minus"></i> </button> 
            <span class="quantite" id="top_ten_nb_pantalon">1</span> 
            <button id="plus_pantalon" type="button" class="btn-plus btn-circle btn-mini"><i class="glyphicon-plus"></i> </button> 
            <div class="prix"><span class="prix_pantalon"> 10</span> €</div> 

           </div> 
         </div> 
        </div> 
        <div class="row"> 
         <div class="col-xs-12 col-sm-6 col-md-6 col-lg-6"> 
           <div class="commande_top_ten"> 
            <div class="col-xs-3 col-sm-4 col-md-4 col-lg-3"><h4>Chemise</h4></div> 
            <img src="img/icone_chemise.svg" /> 
            <button id="moins_chemise" type="button" class="btn-moins btn-circle btn-mini"><i class="glyphicon-minus"></i> </button> 
            <span class="quantite" id="top_ten_nb_chemise">1</span> 
            <button id="plus_chemise" type="button" class="btn-plus btn-circle btn-mini"><i class="glyphicon-plus"></i> </button> 
            <div class="prix"><span class="prix_pantalon"> 10</span> € </div> 

           </div> 
         </div> 
         <div class="col-xs-12 col-sm-6 col-md-6 col-lg-6"> 
           <div class="commande_top_ten"> 
            <div class="col-xs-3 col-sm-4 col-md-4 col-lg-3"><h4>Robe</h4></div> 
            <img src="img/icone_robe.svg" /> 
            <button id="moins_robe" type="button" class="btn-moins btn-circle btn-mini"><i class="glyphicon-minus"></i> </button> 
            <span class="quantite" id="top_ten_nb_robe">1</span> 
            <button id="plus_robe" type="button" class="btn-plus btn-circle btn-mini"><i class="glyphicon-plus"></i> </button> 
            <div class="prix"><span class="prix_pantalon"> 10</span> €</div> 

           </div> 
         </div> 
        </div> 
        <div class="row"> 
         <div class="col-xs-12 col-sm-6 col-md-6 col-lg-6"> 
           <div class="commande_top_ten"> 
            <div class="col-xs-3 col-sm-4 col-md-4 col-lg-3"><h4>Manteau</h4></div> 
            <img src="img/icone_manteau.svg" /> 
            <button id="moins_manteau" type="button" class="btn-moins btn-circle btn-mini"><i class="glyphicon-minus"></i> </button> 
            <span class="quantite" id="top_ten_nb_manteau">1</span> 
            <button id="plus_manteau" type="button" class="btn-plus btn-circle btn-mini"><i class="glyphicon-plus"></i> </button> 
            <div class="prix"><span class="prix_pantalon"> 10</span> € </div> 

           </div> 
         </div> 
         <div class="col-xs-12 col-sm-6 col-md-6 col-lg-6"> 
           <div class="commande_top_ten"> 
            <div class="col-xs-3 col-sm-4 col-md-4 col-lg-3"><h4>Veste</h4></div> 
            <img src="img/icone_pant.svg" /> 
            <button type="button" class="btn-moins btn-circle btn-mini"><i class="glyphicon-minus"></i> </button> 
            <span class="quantite" id="top_ten_nb_veste">1</span> 
            <button type="button" class="btn-plus btn-circle btn-mini"><i class="glyphicon-plus"></i> </button> 
            <div class="prix"><span class="prix_pantalon"> 10</span> €</div> 

           </div> 
         </div> 
        </div> 
        <div class="row"> 
         <div class="row col-xs-12 col-sm-6 col-md-6 col-lg-6"> 
           <div class="commande_top_ten"> 
            <div class="col-xs-3 col-sm-4 col-md-4 col-lg-3"><h4>Pull</h4></div> 
            <img src="img/icone_pull.svg" /> 
            <button id="moins_pull" type="button" class="btn-moins btn-circle btn-mini"><i class="glyphicon-minus"></i> </button> 
            <span class="quantite" id="top_ten_nb_pull">1</span> 
            <button id="plus_pull" type="button" class="btn-plus btn-circle btn-mini"><i class="glyphicon-plus"></i> </button> 
            <div class="prix"><span class="prix_pantalon"> 10</span> €</div> 

           </div> 
         </div> 
         <div class="row col-xs-12 col-sm-6 col-md-6 col-lg-6"> 
           <div class="commande_top_ten"> 
            <div class="col-xs-3 col-sm-4 col-md-4 col-lg-3"><h4>Jupe</h4></div> 
            <img src="img/icone_jupe.svg" /> 
            <button id="moins_jupe" type="button" class="btn-moins btn-circle btn-mini"><i class="glyphicon-minus"></i> </button> 
            <span class="quantite" id="top_ten_nb_jupe">1</span> 
            <button id="plus_jupe" type="button" class="btn-plus btn-circle btn-mini"><i class="glyphicon-plus"></i> </button> 
            <div class="prix"><span class="prix_pantalon"> 10</span> €</div> 

           </div> 
         </div> 
        </div> 
        <div class="row"> 
         <div class="col-xs-12 col-sm-6 col-md-6 col-lg-6"> 
           <div class="commande_top_ten"> 
            <div class="col-xs-3 col-sm-4 col-md-4 col-lg-3"><h4>Draps</h4></div> 
            <img src="img/icone_drap.svg" /> 
            <button type="moins_drap" class="btn-moins btn-circle btn-mini"><i class="glyphicon-minus"></i> </button> 
            <span class="quantite" id="top_ten_nb_drap">1</span> 
            <button type="plus_drap" class="btn-plus btn-circle btn-mini"><i class="glyphicon-plus"></i> </button> 
            <div class="prix"><span class="prix_drap"> 10</span> €</div> 

           </div> 
         </div> 
         <div class="col-xs-12 col-sm-6 col-md-6 col-lg-6"> 
           <div class="commande_top_ten"> 
            <div class="col-xs-3 col-sm-4 col-md-4 col-lg-3"><h4>Chemise</h4></div> 
            <img src="img/icone_chemisepliee.svg" /> 
            <button type="moins_drap" class="btn-moins btn-circle btn-mini"><i class="glyphicon-minus"></i> </button> 
            <span class="quantite" id="top_ten_nb_drap">1</span> 
            <button type="plus_drap" class="btn-plus btn-circle btn-mini"><i class="glyphicon-plus"></i> </button> 
            <div class="prix"><span class="prix_pantalon"> 10</span> €</div> 
           </div> 
         </div> 
        </div> 

        <button type ="submit" class="btn_valider btn btn-danger col-xs-9 col-sm-6 col-md-6 col-lg-4" name="valider_commande" value="valider_commande"><i class="glyphicon glyphicon-shopping-cart"></i>Valider commande (' .$prix_total. ' euros)</button> 
        </form> 
       </div> 
       </div> 
       <?php 
        if (!empty($_SESSION['form_top_ten'])){ 
         $nb_articles = sizeof($_SESSION['commande_top_ten']); 
         $prix_total = 0; 
         for ($i=0;$i<$nb_articles;$i++){ 
         $prix_total += $_SESSION['commande_top_ten'][$i]['prix']; 
         } 
        } 

       ?> 
     </div> 
    <?php 
     } 
     else{ 
     header('Location:auth_form.php'); 
     } 
    ?>

這是head.php線2：

<head> 
    **<title>E-Pressing - <?php echo $titre; ?></title>** 
    <link href="css/bootstrap.css" rel="stylesheet"> 
    <meta charset="UTF-8"> 
    <link href="css/business-frontpage.css" rel="stylesheet"> 
    <link href='http://fonts.googleapis.com/css?family=Poiret+One' rel='stylesheet' type='text/css'> 
    <link href='http://fonts.googleapis.com/css?family=Lato:100,300,400,700,900,100italic,300italic,400italic,700italic,900italic' rel='stylesheet' type='text/css'> 
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"> 
</head>

感謝您的幫助！

來源

2014-02-26 Alex Moody

該錯誤表示您在撥打電話session_start之前輸出了某個地方。你需要確保它是你叫的第一件事情（或者儘可能靠近你可以得到它）下列兩行之前

來源

2014-02-26 02:16:38 Machavity

你不能有空格：

session_start(); 
header('Location:auth_form.php');

還可以通過「黑客通過將ob_start()放在您的PHP腳本的開頭來修復這個問題，以啓用內容的輸出緩衝（如果您沒有其他選擇，只能這樣做）

來源

2014-02-26 02:16:48 Scuzzy

必須在發送任何實際輸出之前調用header（）通過普通的HTML標籤，文件中的空行或來自PHP的空行。使用include或require函數或其他文件訪問函數讀取代碼，並在調用header（）之前輸出空格或空行是非常常見的錯誤。使用單個PHP/HTML文件時存在同樣的問題。在噴泉

<html> 
<?php 
/* This will give an error. Note the output 
* above, which is before the header() call */ 
header('Location: http://www.example.com/'); 
exit; 
?>

飲料：http://php.net/manual/pt_BR/function.header.php
;）

來源

2014-02-26 02:18:51

感謝您的回答，但我已經知道了，我已經檢查，但我沒有找到錯誤！ –

嘗試反轉if。 'if（！isset（$ _ SESSION ['auth']）&& $ _SESSION ['auth']！= true）{'所以，改變標題。我在這裏僞造，它的工作原理。 –

PHP無法修改標題

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