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標頭已發送

[英]Headers Already Sent

現在,如果我用get變量onetwo加載頁面,它將被重定向,但是它在執行此操作之前會顯示此php錯誤: Warning: Cannot modify header information - headers already sent by (output started at /home/site/public_html/lp-19.php:3) in /home/site/public_html/lp-19.php on line 5

這是我的代碼:

<?php if(isset($_GET['one']) && isset($_GET['two'])) {?>

<?php
$value = "none";
setcookie("Disagree", $value, time()+30);
?>


<!DOCTYPE html>
<html>
<head>
<script type='text/javascript' src='//redirect.com/script.js'></script>
</head>
<body>
set "Disagree" cookie and then redirect
</body>
</html>

<?php } else { ?>

<?php
$value = "agree";
setcookie("Yes", $value, time()+3000000);
?>

<!DOCTYPE html>
<html>
set "yes" cookie and display content if no "one" or "two" get variables in url
</html>
<?php }?>

如何擺脫錯誤並根據加載的頁面獲取PHP來設置cookie?

問題是因為cookie是在響應標頭中發送的,必須在響應正文之前將其發送到瀏覽器。 輸出任何東西都進入響應主體。

您可以通過多種方式來解決此問題,包括輸出緩沖,或者簡單地運行將在輸出代碼之前輸出標頭的所有邏輯,但是在這里看來您只是在輸出數據以執行javascript重定向。

不要加載僅用於重定向的JavaScript,請在​​php中設置重定向標頭,這也可以簡化您的代碼:

<?php 
if(isset($_GET['one']) && isset($_GET['two'])) {
    $value = "none";
    setcookie("Disagree", $value, time()+30);
    header('Location: redirectUrlHere'); //<-set the correct url
    die();
}
$value = "agree";
setcookie("Yes", $value, time()+3000000);
?>

<!DOCTYPE html>
<html>
   ...
</html>

根據您的評論進行編輯:

<?php 
if(isset($_GET['one']) && isset($_GET['two'])) {
    $value = "none";
    setcookie("Disagree", $value, time()+30);
}else{
    $value = "agree";
     setcookie("Yes", $value, time()+3000000);
}

if($value=="none"):?>
    <!DOCTYPE html>
    <html>
        <head>
           <script type='text/javascript' src='//redirect.com/script.js'></script>
        </head>
        <body></body>
    </html>
<?php else:?>
    <!DOCTYPE html>
    <html>
        ...
    </html>
<?php endif;?>

嘗試這個 ;)

<?php
$has_value = isset($_GET['one']) && isset($_GET['two']);

if(!$has_value) {
    $value = "agree";
    setcookie("Yes", $value, time() + 3000000);
}

if($has_value) {
    $value = "none";
    setcookie("Disagree", $value, time() + 30);
    ?>
    <!DOCTYPE html>
    <html>
    <head>
        <script type='text/javascript' src='//redirect.com/script.js'></script>
    </head>
    <body>
    set "Disagree" cookie and then redirect
    </body>
    </html>

<?php
}
else {
    ?>

    <!DOCTYPE html>
    <html>
    set "yes" cookie and display content if no "one" or "two" get variables in url
    </html>
<?php }

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